ROHM LogiCoA001-EVK-001 Synchronous Buck DCDC Converter Evaluation Board User Guide

LogiCoATM Power is a solution adopting analog-digital hybrid control to a switching power supply. This user’s guide will provide the steps necessary to operate the evaluation board of LogiCoATM Power Solution Synchronous buck DCDC converter, LogiCoA001-EVK-001. Bill of materials, operating procedures and application data are included.

”LogiCoATM” is a trademark or a registered trademark of ROHM Co., Ltd.

Overview of LogiCoATM Power Solution
Figure 1-1 shows the overview of LogiCoATM Power Solution. LogiCoATM Power is a solution adopting analog-digital hybrid control to a switching power supply and consists from 3 elements, (1) Microcontroller for Power Supply Control (LogiCoATM Microcontroller) ML62Q203x/ML62Q204x (hereinafter referred to ML62Q20xx group), (2) Operating System for Power Supply Control Microcontroller, RMOS, and (3) Power Supply Application. Refer to the explanation application note [1] for detail information of analog-digital hybrid control.

Microcontrollers for Power Supply Control (LogiCoATM Microcontroller)
LogiCoATM Microcontrollers are suitable ones for power supply control with those analog-digital hybrid control is adopted and ML62Q2033/2035 and ML62Q2043/2045 are released. (at the time of this document’s release) On this EVK, ML62Q2035 is mounted. Refer to 4.2 MCU, the datasheet of ML62Q2033/2035/2043/2045 [2] and the user’s manual of ML62Q2033/2035/2043/2045 [3] for more detail information about ML62Q2035.

Operating System for Power Supply Control Microcontroller RMOS (Real time Micro Operating System)
RMOS is a multi-task and real-time operating system developed to control switching power supplies and operates on ML62Q20xx group. Refer to the explanation application note [4] for more detail information about RMOS.
Power Supply Application
Power Supply Applications are application circuits correspond to each power supply topology. On this EVK external components such as LDO, gate driver, operational amplifier, MOSFET inductor and so on are mounted as an application circuit of synchronous buck converter.

Operating Conditions

(Unless otherwise specified Ta=25°C, Vin=12V)

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Input Voltage	Vin	7.5	12.0	38.0	V
Control Block Supply Voltage(LDO)	Vcc5Vldo	4.9	5.0	5.1	V	Vcc5V=LDO Output
Control Block Supply Voltage(USB)	Vcc5Vusb	4.25	5.00	5.75	V	Vin=open, Vcc5V=USB VBUS Output
Driver Block Supply Voltage	Vcc12V	11.4	12.0	12.6	V	Vin>13V
Output Voltage	Vo	–	5.0	–	V	default setting, variable with serial communication
Output Voltage Range	Vo_r	1.0	–	8.0	V	variable with serial communication
Output Current	Io	–	–	5.0	A
Switching Frequency	fsw	–	160	–	kHz	default setting
Switching Frequency Range	fsw_r	80	–	500	kHz
Maximum Duty	Dmax	–	80	–	%	default setting
Soft Start Time	Tsstart	–	5	–	ms	Io=0A
Efficiency	η	–	92	–	%	Vo=5V, Io=5A
Startup Voltage	Vstart	–	9.0	–	V	Vin rise, default setting, variable with serial communication
Startup Voltage Range	Vstart_r	7.5	–	38.0	V
Stop Voltage	Vstop	–	8.0	–	V	Vin fall, default setting, variable with serial communication
Stop Voltage Range	Vstop_r	7.5	–	38.0	V
Startup Delay Time	Tstart	–	1000	–	ms	Vin rise, default setting
Startup Delay Time Range	Tstart_r	10	–	–	ms
Input Voltage Protection	Vivp	–	38.0	–	V	default setting
Input Voltage Protection Range	Vivp_r	7.5	–	38.0	V
Over Current Protection	Iocp	–	6.0	–	A	default setting
Over Current Protection Range	Iocp_r	2.5	–	8.0	A
Output Low Voltage Protection	Vlvp	–	3.0	–	V	Vo fall, default setting
Output Low Voltage Protection Range	Vlvp_r	1.0	–	7.0	V
Output Low Voltage Protection Mask Time	Tlvp	–	500	–	ms	Vo fall, default setting
Output Low Voltage Protection Mask Time Range	Tlvp_r	10	–	–	ms
Output Over Voltage Protection	Vovp	–	6.0	–	V	Vo rise, default setting
Output Over Voltage Protection Range	Vovp_r	1.0	–	10.0	V

Firmware
For this EVK, in addition to the evaluation board, the source code of RMOS and power supply control are supplied. And those can be downloaded from the URL below.

Table 3-1. RMOS download URL and the file name

Download URL	https://www.rohm.com/reference-designs/ref66009
Reference Program Name	LogiCoA^TM Solution Buck Converter Reference Program
File Name	RMOS100-PSFW001.zip

Block Diagram and Description

Block Diagram
Figure 4-1 shows the application block diagram of this EVK.

MCU
On this EVK, MCU ML62Q2035 is mounted as a power supply controller. VDD voltage of MCU is supplied from the control block power supply Vcc5V, and after supplied voltage becomes over 4.10V (typ) of the threshold voltage of POR, the microcontroller startup and RMOS starts its operation. Each pin’s function of ML62Q2035 and selected function in this EVK is listed in Table 4-1.

Table 4-1. Pin list of ML62Q2035

Pin No.	Pin Name	1^st Function	2^nd Function	3^rd Function	4^th Function	5^th Function	6^th Function	7^th Function	8^th Function
Pin No.	Pin Name	GPI/EXI	UART	I²C	OTM	CMP/DAC	ADC	CMP	CMP/ADC
19	VDD	―	―	―	―	―	―	―	―
18	VSS	―	―	―	―	―	―	―	―
17	VDDL	―	―	―	―	―	―	―	―
16	P01	―	―	―	―	CMP0P	―	CMP0P /CMP1P	CMP0P
15	P02	―	―	―	OTO4B	CMP0M	―	CMP0M /CMP1M	CMP0M
14	P03	EXI0	―	―	OTO0A	―	―	―	―
13	P04	EXI1	―	―	OTO0B	―	―	―	―
12	P05	EXI1	―	―	OTO1A	―	―	―	―
11	P06	EXI2	―	―	OTO2A	―	―	―	―
10	P10	EXI3	RXD1, (/TXD1)	―	OTO3A	―	―	―	―
9	P11	―	―	―	OTO4A	CMP2P	―	CMP2P	CMP2P
8	P12	―	RXD0, (/TXD0)	SDAU0	OTO1B	―	―	―	―
7	P00/TEST0	EXI3	―	―	―	―	―	―	―
6	P13	EXI2	TXD0	SCLU0	OTO5B	―	AIN4	―	―
5	RESET_N	―	―	―	―	―	―	―	―
4	P14	―	―	―	―	CMP1P	AIN0	CMP1P /CMP2P	AIN0 /CMP1P
3	P15	―	―	―	―	CMP1M	AIN1	CMP1M /CMP2M	AIN1 /CMP1M
2	P16	―	―	―	―	CMP2M	AIN2	CMP2M	AIN2 /CMP2M
1	P17	EXI0	―	―	―	―	AIN3	―	―
20	P23	―	TXD1	―	OTO5A	DACOUT0	―	―	―

Table 4-2 listed the typical specifications of ML62Q2035. Refer to [2] and [3] for more detail information about ML62Q2035.

Table 4-2. Typical specifications of ML62Q2035

Part Number		ML62Q2035
CPU		16bit RISC CPU Core(nx-U16/100), Max operating frequency 16MHz
Memory		Code Flash: 32KB, Data Flash: 4KB(Erase Unit:128B), RAM: 2KB
Analog Comparator		3ch(asynchronous to clock), Response time: Max 100ns
Timer		16bit timer with PWM/Capture × 6 counters, 10 outputs
		Max 64MHz operation(Resolution 15.625ns)
AD Converter		12bit SA-ADC: 5ch
DA Converter		8bit, 2ch
Programmable Gain Amplifier		1ch, Gain Setting: 4 steps (×4/×8/×16/×32)
Serial I/F		I²C×1, UART×2
I/O Port		I: 1, I/O: 15
External Interrupt		4
Other		Multiplication/Division Unit, Temperature Sensor, Power ON Reset
Clock	Low	Internal RC Oscillator: 32.768kHz ± 1.5%*
	High	PLL: 64MHz ± 1.5%, CPU: 16MHz to 125kHz ± 1.5%
		PWM/Capture: 64MHz to 500kHz ± 1.5%*
Current Consumption(CPU)		Stop: 80μA, Halt: 90μA, Active: 3.3mA@16MHz
Operating Supply Voltage		4.5V to 5.5V
Operating Temperature		Ta=-40℃ to +105℃(Tj=115℃) (Absolute maximum ratings:Tjmax=125℃)
Package		TSSOP20

Control Block Power Supply
On this EVK, a fixed 5V output LDO BD950N1WG-C is mounted as a power supply (Vcc5V) for control block (MCU and analog control circuit). BD950N1WG-C has standby control function, but in this EVK, VIN pin and EN pin are shorted and so when Vin voltage is applied and VIN pin of BD950N1WG-C voltage is over UVLO rise voltage (typ 2.6V), Vcc5V turns on. Refer to the datasheet of BD9xxN1-C series [5] for more detail information about BD950N1WG-C.

Driver Block Power Supply
On this EVK, a 12V output LDO BD900N1WG-C is mounted as a power supply (Vcc12V) of the gate driver to drive output FET. BD900N1WG-C has standby control function and can be controlled turning ON/OFF by a remote control switch described later. Refer to the datasheet of BD9xxN1-C series [5] for more detail information about BD900N1WG-C.

Remote Control Switch
This EVK has RC (RC: Remote Control) function for external turning ON/OFF control. DCDC operates as the setting below by turning the mechanical switch (SW_RC) connected P10 pin of ML62Q2035 to OPEN or short to GND. To avoid a false detection by noise, there are mask time of 150μs at RC=H detection and 1.25ms at RC=L. P10 pin is set as a GPIO with internal 40kΩ(typ) pulled-up. Refer to [2] about the threshold of operating state because it depends on input/output characteristics of ML62Q2035.

Table 4-3. Operating state of Remote Control Switch

SW_RC	P10 pin	DCDC
OPEN	VDD	ON
GND SHORT	GND	OFF

Error Amplifier and Reference Voltage

Figure 4-2 shows the error amplifier and surrounding circuits. BU7481SG is mounted on as an error amplifier. As control block power supply Vcc5V is supplied, the error amplifier starts to operate but startup of the error amplifier output is controlled by the soft start circuit. Refer to the datasheet of that [6] for more detail information about BU7481SG.
The reference voltage of error amplifier Vo_REF is generated by the 8-bits DA converter built-in in the MCU (1.973V at VDD=5V). Output voltage Vo is calculated as following equation.

?? = ??_??? × ?29 + ?30 + ?31/ ?31

Ex.) When Vo_REF=1.973V, R29=51Ω, R30=3.3kΩ and R31=2.2kΩ, output voltage is as below.

Soft Start

In this EVK, to avoid an overshoot and rush current, output of the error amplifier (FB) is clamped while starting up, thus ramp up speed of DCDC output is controlled and starts softly.
The FB voltage is clamped by the CLAMP voltage + VBE of TR1 because the voltage generated at both ends of R18 can be considered minute due to R18=100Ω and TR1 base current. P03/OTO0A pin has been set as PMOS open drain, and while in startup, clamped voltage rise up slowly by controlling the ON duty of the PMOS. In the steady state, the CLAMP voltage is equal to VDD and thus the FB voltage is not clamped.

Triangle Waveform Generator and PWM Comparator

Figure 4-4 and 4-5 shows the triangle waveform generator and surrounding circuits, and timing chart. Triangle waveform is generated at P02/CMP0M pin by clock pulse output from P04/OTO0B pin. P01/CMP0P pin and P02/CMP0M pin have been set as an input of analog comparator and the build-in analog comparator operate as the PWM comparator.
As shown in Figure 4-5, the frequency of clock pulse output from P04/OTO0B pin is the switching frequency of the DCDC converter fsw (160kHz). And while the output of the clock pulse is H, the voltage of TRNGL becomes also H, so the output of the PWM comparator is L. This leads that the L duty of the clock pulse is the Max Duty Dmax (80% typ) of the DCDC converter.

Volume Resistor for open loop operation (for debug)
This EVK can be operated in open loop without feedback control for debugging. Open loop and closed loop operation can be exchanged by the jumper connection of JP_Loop (refer to Figure 4-1. Application Block Diagram and Figure 4-4. Triangle waveform generator and surrounding circuit.) When open loop operation is selected, the input voltage of the PWM comparator can be tuned using volume resistor VR1. The divided voltage from Vcc5V by R21 and 10kΩ volume resistor VR1 will be the FB voltage (0Ω is mounted on R22.)

Output Stage
In output stage, the control signals of H-side/L-side FET from the MCU level shifted by the gate driver drive output FETs, and stable voltage smoothed by the LC filter is supplied. BD2320EFJ-LA is mounted on as a gate driver. Refer to the datasheet of that [7] for more detail information of BD2320EFJ-LA.

Input Voltage Detection Block
Figure 4-6 shows the input voltage detection block. The divided Vin voltage by R6 and R7 is input to the P15/AIN1 pin of ML62Q2035, and the digital value of pin input voltage converted by the 12bits AD converter is obtained.

Startup/Stop Voltage Check
In this EVK, Vin input voltage is monitored by the input voltage detection block described above and when the voltage is over the startup voltage of 9V, DCDC startups after the 1s of the startup delay time. When the input voltage is below 8V, DCDC stops. For a noise reduction, there is a 150μs of mask time in voltage detection.
Input Voltage Protection
This EVK has an input over voltage protection function (IVP: Input Voltage Protection). Vin input voltage is monitored by the input voltage detection block described above and when the voltage is over the detect voltage of 38V, the protection works and DCDC stops output switching. For a noise reduction, there is a 250μs of mask time in voltage detection. When the input voltage is below the detect voltage in the normal operation state, count of the mask time is reset. When protection works, DCDC stops latched, and restarts after turning on RC again in the condition that Vin input voltage is under the detection threshold voltage.

Output Voltage Detection Block
Figure 4-7 shows the output voltage detection block. The divided Vo voltage by R32 and R33 is input to the P14/AIN0 pin of ML62Q2035, and the digital value of pin input voltage converted by the 12bits AD converter is acquired.

Low Voltage Protection
This EVK has an output low voltage protection function (LVP: Low Voltage Protection). Vo output voltage is monitored by the output voltage detection block described above and when the voltage drops less than the detect voltage of 3.0V, timer count starts. When the output voltage remains below the detect voltage and 500ms has passed, protection works and DCDC stops output switching. The timer counter is incremented from the initial value by every 500μs, and when the output voltage becomes over the detect voltage while in timer counting, the counter value is decremented. When DCDC stops by the protection or RC, the timer counter is reset. When protection works, DCDC stops latched, and restart after turning on RC again.
Over Voltage Protection
This EVK has an output over voltage protection function (OVP: Over Voltage Protection). Vo output voltage is monitored by the output voltage detection block described above and when the voltage is over the detect voltage of 6.0V, the protection works, and DCDC stops output switching. For a noise reduction, there is a 250μs of mask time in voltage detection. When the output voltage drops less than the detect voltage in the normal operation state, count of the mask time is reset. When protection works the DCDC stops latched, and restart after turning on RC again.

Drain Current Detection Block
Figure 4-8 shows the drain current detection block. The drain current Id flows through low side FET, FET2, is converted to the voltage VSNS in the current sense resistor R5. VSNS divided from Vcc5V by R8, R9 and R10, R11, and added certain offset voltage to meet the input voltage range of AD converter/analog comparator, are input to P16/AIN2 pin and P11/CMP2P pin of ML62Q2035 each. By the built-in AD converter in P16/AIN2 pin, the digital value of the current is acquired and the built-in comparator in P11/CMP2P pin detect the overcurrent.

Over Current Protection
This EVK has a pulse-by-pulse over current protection function (OCP: Over Current Protection). The drain current of low side FET is monitored by the analog comparator in the drain current detection block described above. When the current exceeds the detect threshold value of 6.0A, protection works and turning off the FET. After the detection, DCDC restarts from protection automatically, but if the overload state continues, OCP is detected again.

LED Indicator
In this EVK, 2 LEDs of LED1(red) and LED2(green) are mounted on. And each blinking pattern indicates below operating state.

Table 4-4. LED1 Blinking pattern and operating state

LED1	State
Off	–
Blinking	Program writing/Accessing to MCU

Table 4-5. LED2 Blinking pattern and operating state

LED2	State
1 time short blink(100ms x 1) in 1.6ms period	Vin input voltage is below startup voltage(Vin stop state)
2 times short blink(100ms x 2) in 1.6ms period	Vin input voltage is over startup voltage and standby with RC control(RC standby state)
1 time blink(700ms x 1) in 1.6ms period	Normal operation state
5 times short blink(100ms x 5) in 1.6ms period	Abnormal stop state

Serial Communication

In this EVK, modification of power supply control parameter and recording the operating log are capable of by a serial communication via the on-board USB-UART covert module from such as an external Windows PC. (Logging function is not implemented at the time of this document’s release.) Refer to the explanation application note of communication function and GUI[8] for more detail information about the serial communication and communication commands.

View of EVK
Figure 6-1 and Figure 6-2 shows the view of EVK.

Operating Procedure

Short 1-2 pins of the jumper JP_LDO, 1-2 pins of JP_12V, 2-3 pins of JP_Loop and open JP_REG on the EVK.

Turn the SW_RC to connect 1-2pins on EVK. (Turn the switch to upper side in the board direction of Figure 6-1.)
Turn off the DC power supply and connect it’s GND pin to 2 pin of J1 on the EVK.
Connect DC power supply’s VCC pin to 1 pin of J1 on the EVK.

Connect the load between 1 pin and 2 pin of J2 on the EVK. When an electric load is used, turn off the output before connecting to the board.
Connect the voltmeter to the mon_Vo pin and mon_GND pin on the EVK.
Turn on the DC power supply. Check if the measured value of the voltmeter is 5V.

If an electric load is used, turn on the electric load.

Notes: This EVK does not support hot plugging protection. Do not perform hot plugging on this board.

Board Schematic

Board Information and Layout

The board information of this EVK is listed in Table 9-1.

Table 9-1. Board information

Below are EVK layouts.

Bill of Materials

Table 10-1 shows the bill of materials of this EVK.

Table 10-1. Bill of Materials

Quantity	Reference Designator	Part Number	Manufacturer	Value	Description [Unit: inch(mm)]
IC
1	IC1	BD2320EFJ-LAE2	ROHM	–	Gate Driver,14.5V,2024(4960)
1	IC2	BD950N1WG-CTR	ROHM	–	LDO, 42V, 5V/150mA,1112(2829)
1	IC3	ML62Q2035-NNNTDZWATZ	LAPIS Technology	–	MCU, 5.5V, 32kbyte,2526(6465)
1	IC4	BD900N1WG-CTR	ROHM	–	LDO, 42V, 150mA,1112(2829)
1	U1	BU7481SG-TR	ROHM	–	1ch-OPAMP,5.5V,1112(2829)
Resistor
1	R1	–	–	4.7Ω	0.1W,±1%,0603(1608)
3	R2,R22,R42	–	–	0Ω	1A,0.1W,0603(1608)
4	R3,R4,R12,R14	–	–	10kΩ	0.1W,±1%,0603(1608)
1	R5	LTR100LJZPFSR020	ROHM	20mΩ	4W,±1%,1225(3264)
1	R6	–	–	220kΩ	0.1W,±1%,0603(1608)
1	R7	–	–	27kΩ	0.1W,±1%,0603(1608)
6	R8,R13,R15,R19,R31,R33	–	–	2.2kΩ	0.1W,±1%,0603(1608)
1	R9	–	–	330Ω	0.1W,±1%,0603(1608)
1	R10	–	–	820Ω	0.1W,±1%,0603(1608)
1	R11	–	–	150Ω	0.1W,±1%,0603(1608)
4	R16,R17,R32,R44	–	–	4.7kΩ	0.1W,±1%,0603(1608)
3	R18,R35,R36	–	–	100Ω	0.1W,±1%,0603(1608)
1	R20	–	–	470Ω	0.1W,±1%,0603(1608)
2	R21,R24	–	–	1kΩ	0.1W,±1%,0603(1608)
0	R23	No mount	–	–	–
1	R25	–	–	8.2kΩ	0.1W,±1%,0603(1608)
4	R26,R27,R38,R40	–	–	10Ω	0.1W,±1%,0603(1608)
1	R28	–	–	43Ω	0.1W,±1%,0603(1608)
1	R29	–	–	51Ω	0.1W,±1%,0603(1608)
1	R30	–	–	3.3kΩ	0.1W,±1%,0603(1608)
0	R39,R41	No mount	–	–	–
1	R43	–	–	82kΩ	0.1W,±0.5%,0603(1608)
1	R44	–	–	4.7kΩ	0.1W,±0.5%,0603(1608)
1	VR1	CT-6EP103	Nidec Copal Electronics	10kΩ	70.7V,0.5W,±10%,2828(7070)
Capacitor
4	C1,C2,C3,C4	C3225X7S2A475K200AE	TDK	4.7μF	100V,X7S,±10%,1210(3225)
4	C5,C19,C24,C25	CGA3E1X7R1E105K080AC	TDK	1μF	25V,X7R,±10%,0603(1608)
3	C6,C18,C31	CGA3E2X7R1H104K080AA	TDK	0.1μF	50V,X7R,±10%,0603(1608)
6	C7,C8,C9,C10,C11,C12	GRM32ER71E226ME15L	Murata	22μF	25V,X7R,±20%,1210(3225)
2	C13,C35	GRM21BR61H475ME51L	Murata	4.7μF	50V,X5R,±20%,0805(2012)
2	C14,C36	GRM188R6YA475ME15D	Murata	4.7μF	35V,X5R,±20%,0603(1608)
2	C15,C22	CC0603JRNPO9BN470	Yageo	47pF	50V,C0G,±5%,0603(1608)
0	C16	No mount	–	–	–
2	C17,C21	GRM188B11H103K	Murata	0.01μF	50V,B,±10%,0603(1608)
1	C20	CGA3E2C0G1H471J080AA	TDK	470pF	50V,C0G,±5%,0603(1608)
1	C23	CGA3E3X7R1H224K080AB	TDK	0.22μF	50V,X7R,±10%,0603(1608)
2	C26,C33	CGA3E2X7R1H102K080AA	TDK	1000pF	50V,X7R,±10%,0603(1608)
1	C27	CGA3E2C0G1H822J080AA	TDK	8200pF	50V,C0G,±5%,0603(1608)
1	C28	CGA3E2C0G1H561J080AA	TDK	560pF	50V,C0G,±5%,0603(1608)
2	C29,C30	CGA3E2C0G1H101J080AA	TDK	100pF	50V,C0G,±5%,0603(1608)
1	C32	CGA3E2X7R1H223M080AA	TDK	0.022μF	50V,X7R,±15%,0603(1608)
1	C34	C1608X5R1E475M080AC	TDK	4.7μF	25V,X5R,±20%,0603(1608)
1	CE1	UCDH101MCL6GS	Nichicon	100μF	50V,±20%,0.36Ωmax,Φ10
1	CE2	APXT100ARA391MF80G	Chemi-con	390μF	10V,±20%,22mΩmax,Φ6.3
Diode
1	D1	RB510SM-40T2R	ROHM	–	40V,100mA,0603(1608)
1	D2	RB500SM-30T2R	ROHM	–	30V,100mA,0603(1608)
1	D3	1SS355VMTE-17	ROHM	–	80V,100mA,1005(2513)
2	ZD1,ZD2	EDZVT2R6.2B	ROHM	–	6.2V,5mA,150mW, 0603(1608)
Transistor
1	TR1	2SA2029T2LR	ROHM	–	-50V,150mA,0505(1211)
2	FET1,FET2	RS6L090BGTB1	ROHM	–	60V,90A,4.7mΩmax,2024(4960)
Inductor
1	L1	XAL1010-153MED	Coilcraft	15μH	60V,9.9A,18.6mΩmax,±20%,(10.0 x 11.3)
LED
1	LED1	SML-D13U8WT86	ROHM	–	RED,2.1V,20mA,52mW,0603(1608)
1	LED2	SML-D12P8WT86	ROHM	–	GRN,2.2V,20mA,54mW,0603(1608)
Others
1	J3	HIF3FC-14PA-2.54DSA(71)	Hirose Electric	–	200V,1A,IMD14-2.54-H9.3-HIF3FC_DSA,200Vac,1A
2	JP_LDO,JP_12V	61300211121	Wurth Elektronik	–	250V,3A,2.54,5.08*2.54
2	JP_Loop,JP_REG	61300311121	Wurth Elektronik	–	250V,3A,2.54,7.62*2.54
1	SW_RC	ATE1E-2M3-10-Z	Nidec Copal Electronics	–	ON-OFF-ON,2.54-ATE1,60V,50mA,0.4VA
2	J1,J2	XW4E-02C1-V1	Omron	–	250V,13.5A,5.08-XW4E,250V,13.5A
1	FT234x	AE-FT234X	AKIZUKI DENSHI TUSHO	–	5V, 2.54, FT234XD

Reference Application Data

References

66AN145E, Rev001, Analog-Digital hybrid control innovating switching power design
FEDL62Q2045-01, ML62Q2033/2035/2043/2045 datasheet
FEUL62Q2045-03, ML62Q2033/2035/2043/2045 User’s Manual

66AN147E, Rev.001, Operating system for switching power control MCU “RMOS”
TSZ02201-0BDB0A400100-1-2 Rev.001, For Automotive 45V 150mA Fixed/Adjustable Output Nano CapTM LDO Regulators BD9xxN1-C Series datasheet
TSZ02201-0RAR0G200370-1-2 Rev.001, High Speed Low Voltage Operation CMOS Operational Amplifiers BU7481G BU7481SG datasheet

TSZ02201-0Q2Q0A800840-1-2, Rev.002, High Frequency High-Side and Low-Side Driver BD2320EFJ-LA datasheet
66AN149E, Rev.001, Serial communication of RMOS and GUI developing manual

Revision History

Date	Revision Number	Description
10. May.2024	001	Initial release.
31. Oct. 2024	002	p.12 Add description of 4.14 LED indicator. p.17 Add measurement condition and comment in Figure 11-2 and 11-3.

Notice

The information contained in this document is intended to introduce ROHM Group (hereafter referred to asROHM) products. When using ROHM products, please verify the latest specifications or datasheets before use.
ROHM products are designed and manufactured for use in general electronic equipment and applications (such as Audio Visual equipment, Office Automation equipment, telecommunication equipment, home appliances, amusement devices, etc.) or specified in the datasheets. Therefore, please contact the ROHM sales representative before using ROHM products in equipment or devices requiring extremely high reliability and whose failure or malfunction may cause danger or injury to human life or body or other serious damage (such as medical equipment, transportation, traffic, aircraft, spacecraft, nuclear power controllers, fuel control, automotive equipment including car accessories, etc. hereafter referred to as Specific Applications). Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties arising from the use of ROHM Products for Specific Applications.

Electronic components, including semiconductors, can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe design against physical injury, and damage to any property, which a failure or malfunction of products may cause.
The information contained in this document, including application circuit examples and their constants, is intended to explain the standard operation and usage of ROHM products, and is not intended to guarantee, either explicitly or implicitly, the operation of the product in the actual equipment it will be used. As a result, you are solely responsible for it, and you must exercise your own independent verification and judgment in the use of such information contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties arising from the use of such information.
When exporting ROHM products or technologies described in this document to other countries, you must abide by the procedures and provisions stipulated in all applicable export laws and regulations, such as the Foreign Exchange and Foreign Trade Act and the US Export

Administration Regulations, and follow the necessary procedures in accordance with these provisions. The technical information and data described in this document, including typical application circuits, are examples only and are not intended to guarantee to be free from infringement of third parties intellectual property or other rights. ROHM does not grant any license, express or implied, to implement, use, or exploit any intellectual property or other rights owned or controlled by ROHM or any third parties with respect to the information contained herein.
No part of this document may be reprinted or reproduced in any form by any means without the prior written consent of ROHM.
All information contained in this document is current as of the date of publication and subject to change without notice. Before purchasing or using ROHM products, please confirm the latest information with the ROHM sales representative.

ROHM does not warrant that the information contained herein is error-free. ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties resulting from errors contained in this document.

Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us.

ROHM Customer Support System: https://www.rohm.com/contactus

FAQ

Q: Can I use a different input voltage than 12V?
A: The evaluation board is designed for a 12V input voltage. Deviating from this may result in improper functioning or damage to the board.

Q: How can I update the firmware on the evaluation board?
A: Refer to the user manual or manufacturer’s guidelines for detailed instructions on updating the firmware of the evaluation board.

Documents / Resources

ROHM LogiCoA001-EVK-001 Synchronous Buck DCDC Converter Evaluation Board [pdf] User Guide
LogiCoA001-EVK-001, LogiCoA001-EVK-001 Synchronous Buck DCDC Converter Evaluation Board, Synchronous Buck DCDC Converter Evaluation Board, DCDC Converter Evaluation Board, Converter Evaluation Board, Evaluation Board

References

User Manual

ROHM LogiCoA001-EVK-001 Synchronous Buck DCDC Converter Evaluation Board

Specifications

Introduction