User Manual for ALLEGRO models including: APM80950 Evaluation Board, APM80950, Evaluation Board
APM80950/51: 1.5 A PWM Dimmable Synchronous Buck LED Module
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DocumentDocumentUser Manual APM80950 Evaluation Board Low-EMI 1.5 A PWM Dimmable SR Buck LED Module EMC filter configuration D1 VEMI VEMI GND CF1 10 nF 0603 120 @ 100 MHz FB1 CF2 0805 0.47 µF 742792023 1210 NetBead CF3 Empty 0603 CINf 4.7 µF 1210 Lf VIN 6.8 µH Schematic for APM80950 RFPWM = 0 , Rdrb = 0 , Rdrt = Empty U1 Customer EVB VOUT 32 VOUT 31 VOUT 30 29 SW 28 27 VIN P1 2 1 VIN 1 VOUT 2 VOUT 3 VOUT 4 SW 26 25 BOOT 24 APM80950 23 0.2 for 1 A RS1 1206 5 CIN3 CIN2 CIN1 6 1210 0805 Empty 4.7 µF 0402 Empty 7 8 9 REN 10 0402 10 k VIN VIN PGND PGND EN CSH 22 CSL 21 SGND 20 RNG 19 VCC 18 NC 17 Ccs Empty RngL 0402 RNG CSL RngH 0402 CV VCC 0603 1 µF RngH = 0 , RngL = Empty, RNG = High RngH = Empty, RngL = 0 , RNG = Low RFPWM 11 12 PWM 13 FDSET 14 ADIM 15 FFn 16 NC EN 0402 Rfdt 100 k Rfdb 0402 300 k PWM AD IM Rffn 0402 10 k VCC Rdrt V CC 0402 0402 Rdrb 0402 FFn LED+ CL1 0.047 µF GND Figure 1: Demo Board Schematic GENERAL SPECIFICATIONS Specification Absolute Maximum Input Voltage Operating Input Voltage Range VVIN START Threshold, VVIN rising VVIN UVLO Hysteresis LED Regulation Current Enable Input VCC, ADIM, RNG, FDSET, FFn, PWM Terminal Voltages Min Nom. Max. Units 0.3 - 40 V 4.5 - 36 V - - 4.3 V 100 - 300 mV - - 1.5 A 0.3 - VVIN + 0.3 V 0.3 - 7 V APM80950-UM March 12, 2021 BILL OF MATERIALS Designator Description Footprint Quantity PCB TED-0003126-PCB N/A 1 (APM80900/04/50/51 PCB) U1 APM80950 IC QFN-32 1 RS1 Resistor, 0.2 , 1/2 W, 1% 1206 1 Rfdt Resistor, 100 k, 1/16 W, 1% 0402 1 Rfdb Resistor, 300 k, 1/16 W, 1% 0402 1 REN, Rffn Resistor, 10 k, 1/16 W, 1% 0402 2 Rdrb, RngH, RFPWM Resistor, 0 k, JUMPER 1/16 W 0402 3 Rdrt, RngL Empty 0402 0 CV Capacitor, Ceramic, 0603 1 1.0 µF, 50 V,10%, X7R CL1 Capacitor, Ceramic, 0805 1 0.047 µF, 100 V, X7R 0805 Cin1, Cin3, CF3, Ccs Empty Various 0 Cin2 Capacitor, Ceramic, 4.7 µF, 0805 1 50 V, X7S FB1 0805 SMT FERRITE BEAD, 0805 1 120 @ 100 MHz, 3 A D1 DIODE SCHOTTKY 100 V 2 A DO-220AA (SMP) 1 DO220AA Lf FIXED IND 6.8 µH 3 A 74 M 4.1 × 4.1 mm 1 SMD 3.1 mm thick CF1 Capacitor, Ceramic, 0603 1 10 nF, 100 V, 10%, X7R CF2 Capacitor, Ceramic, 1210 1 0.47 µF, 100 V, X7R Cinf Capacitor, Ceramic, 1210 1 4.7 µF, 100 V, X7R VIN, LED+ Test Points, Red, 0.063" diameter 0.063" 2 EN, PWM, ADIM, FFn, VCC Test Points, White, 0.063" diameter 0.063" 5 GND Test Points, Black, 0.063" 4 0.063" diameter P1 Header, Male, 2 position (open) 0.1" pitch 1 PL1, PL2 CONN TERM BLOCK 2 POS 2 5.08 MM PCB Rubber Feet Self stick rubber feet Clear 4 Manufacturer Allegro MicroSystems Allegro MicroSystems Susumu Panasonic Electronic Panasonic Electronic Panasonic Electronic Vishay Dale Taiyo Yuden Murata TDK Murata Wurth Electronics Vishay Wurth Electronics TDK TDK TDK Keystone Keystone Keystone Sullins Phoenix Contact 3M Manufacturer P/N APM80950KNBATR RL1632R-R200-F ERA-2AED104X ERJ-2RKF3003X ERA-2AED103X CRCW04020000Z0ED UMK107AB7105KA-T GCM21BR72A473KA37L C2012X7R2A473K125AA GRM21BC71H475KE11L 742792023 SS2PH10HM3/84A 74438357068 C1608X7R2A103K080AA CGA6M3X8R2A474K200AB CGA6M3X7S2A475K200AB 5010 5012 5011 PEC02SAAN 1715721 SJ-5303 (CLEAR) Source Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Purchase P/N RL16R.20FCT-ND P100KDECT-ND P300KLCT-ND P10KDECT-ND 541-0.0JCT-ND 587-3247-1-ND 490-4969-1-ND 445-2276-1-ND 490-12757-1-ND 732-1613-1-ND SS2PH10HM3/ 84AGITR-ND 732-11204-1-ND 445-1304-1-ND 445-13052-1-ND 445-7005-1-ND 5010K-ND 5012K-ND 5011K-ND S1012E-02-ND 277-1263-ND SJ5303-7-ND 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CONFIGURATIONS (Refer to Datasheet) The customer APM80950 EVB is configured for external PWM dimming operation mode only, so an external PWM dimming signal at test point PWM must be applied because the PWM pin is pulled down to GND through an internal resistor. Put jumper on P1 connector to connect EN to VIN through a resistor to enable the unit. RngH or RngL resistors determine the LED current range high or low: RNG = VCC by making RngH = 0 and RngL = Open RNG = GND by making RngH = Open and RngL = 0 Full rated voltage VCSREG across current sensing resistor Rs1 = 200 mV Full rated voltage VCSREG across current sensing resistor Rs1 = 100 mV 1. The regulation LED current level is determined by the current sensing resistor on board: iLED = 0.2 / Rs1 iLED = 0.1 / Rs1 iLED = 0.2 / Rsense (A) On EVB, there is one current sensing resistor, Rs1 = 0.2 . Because RNG = VCC, the full LED current is 1 A. 2. Apply external analog dimming signal at test point ADIM. Do not leave ADIM floating. ADIM pin voltage controls the LED cur- rent reference voltage across Rs1 according to the equation below: VCSREG = (VADIM 0.4) / 5 (V) The calculation and actual test results are shown below as reference to select the desired ADIM voltage. 3 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com OPERATING INSTRUCTIONS Refer to figure below for demo board setup. In order to enable the EVB, use the attached jumper to short the connector P1 so that EN is connected to VIN, or apply a voltage level above 1.8 V to the test point EN if the jumper is not used. Apply the desired ADIM voltage at ADIM test point. Apply PWM signal at PWM test point. Connect LED load between LED+ to GND; apply input power supply. Figure 2: Demo Board Setup 4 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com DEMO BOARD PERFORMANCE 5 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com DEMO BOARD PERFORMANCE (continued) 6 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com EMI PERFORMANCE VVIN = 12 V, Load = 2 series white LEDs, ILED = 0.5 A, with EMI filters, as shown in figure below, TA = 25°C 7 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com DEMO PCB LAYOUT 8 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Revision History Number Date March 12, 2021 Initial Release Description Copyright 2021, Allegro MicroSystems. The information contained in this document does not constitute any representation, warranty, assurance, guaranty, or inducement by Allegro to the customer with respect to the subject matter of this document. The information being provided does not guarantee that a process based on this information will be reliable, or that Allegro has explored all of the possible failure modes. It is the customer's responsibility to do sufficient qualification testing of the final product to ensure that it is reliable and meets all design requirements. Copies of this document are considered uncontrolled documents. 9 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com