DC-DC Converter Introduction

Product Manager: MEAN WELL Product Strategy Center
Frank Chen | frank@meanwell.com

Outline

DC-DC Introduction
Product Categories and Roadmap
DC-DC Specifications
MEAN WELL DC-DC Advantages
Applications

DC-DC Introduction

Why Choose DC-DC ?

A block diagram shows two DC inputs connected to two DC outputs, representing a DC-DC conversion.

AC-DC rectifier + DC-DC point-of-load application
Long wiring causes voltage drop; add DC-DC to pull up voltage and solve the voltage drop issue.
For locations without AC power, DC-DC converters provide power to loads from battery or renewable energy sources.
Reduce ripple and noise.
Additional isolation improves equipment safety.

AC-DC + DC-DC Point-of-Load Application

This diagram illustrates a power flow starting from Utility AC input (90-264Vac) going through an AC/DC power supply to produce 48Vdc. This 48Vdc can then be transformed by an Isolated DC/DC converter to 12Vdc, which feeds into a Load. Multiple paths exist, including direct transformation to 12Vdc or using a Boost voltage DC/DC converter. The diagram also notes 'Voltage drop due to cable length'. The applications for this setup include Data center, Telecom, and Networking.

No Utility AC – Power from DC Source

This diagram shows power generation without utility AC. A DC source (24~110Vdc) is stabilized by a DC/DC converter, producing 12/24/48Vdc. This can then be transformed by an Isolated DC/DC converter to 5Vdc for a Load, or by a Non-Isolated converter to 12Vdc, which is then processed by a DC-DC converter for noise reduction, also feeding into a Load. This setup is applicable for Railway systems.

Additional Isolation

This diagram demonstrates upgrading system safety. Utility AC input (90-264Vac) is converted by an AC/DC power supply to 24Vdc. A Medical grade DC/DC converter then reduces leakage current and meets MOPP*2 standards, providing various output voltages (3.3 Vdc, 5 Vdc, 12Vdc, 15 Vdc, ±12 Vdc, +15 Vdc, etc.) to a Medical device Load.

DC-DC Converter Categories

Mounting Type	Series	Description
Enclosed	SD series	Industrial, 15~1000W
	RSD series	Industrial + Railway, 30~500W
DIN rail	DDR series	Industrial + Railway, 15~480W
	DDRH series	Solar PV, 60W
PCB	PSD series	Industrial, 15~40W
On-board	Potted	SMD, SIP, DIP24, 1"x1", 2"x1", 2"x2" and Brick, 0.5~150W
	Non-Potted	Isolated NSD series 5~15W, Non-isolated NID series 35~100W

Railway DC-DC Selection Table

Mounting Type	Series	Watt. (W)	Vin (Vdc)	Vo (Vdc)	Operating temp.	Safety	Dimension (mm)
Encapsulated Modules (Pin mount)	RSDW/RDDW08	8	F: 9~36V G: 18~75V	Single: 3.3/5/12/15V Dual: ±5/12/15V	-40 ~ +85°C	EAC/CE (EN50155, EN55032)	31.820.810.2
	RSDW/RDDW10	10	H: 43~160V		-40 ~ +85°C	EAC/CE (EN50155, EN55032)	50.825.410.2
	RSDW/RDDW20	20	9~160V	Single : 5/12/15 Dula : ±12/15/24V
	RSDW/RDDW20UW	20
	RSDW/RDDW40	40	F: 9~36V G: 18~75V	Single: 3.3/5/12/15/24/48V Dual : ±12/15V
	RSDW/RDDW60	60	H: 40~160V
Enclosed Type (Terminal block)	RSD-30	30	G: 9~36V L: 18~72V	Single: 3.3/5/12/15/24V	-40 ~ +70°C	CB/UL 62368-1	1136025
	RSD-60	60	H: 40~160V		1286025
	RSD-100	100		Single : 5 / 12 / 24 / 48V	1616836
	RSD-150	150	B: 16.8~31.2V C: 33.6~62.4V	Single: 12/24 / 48V	-40 ~ +80°C	EAC/CE (EN50155, EN55032)	1897736
	RSD-200	200	D: 67.2~154V				1918640
	RSD-300	300	E: 25.2~46.8V	Single: 5 / 12 / 24 /48V			21696.540
	RSD-500	500	F: 50.4~93.6V	Single: 12 / 24 / 48V	-40~+80°C		23710041
DIN rail (Rail mount)	DDR-120	120	A: 9~18V B: 16.8~33.6V C: 33.6~67.2V D: 67.2~154V	Single: 12 / 24 / 48V	-40 ~ +70°C	CB/UL 62368-1	32125.2102
	DDR-240	240		Single: 24 / 48V		EAC/CE (EN50155, EN55032)	40125.2113.5
	DDR-480	480		Single: 12 / 24 / 48V	-40 ~ +80°C		85.5125.2128.5

DC-DC Roadmap

Enclosed Type

This roadmap chart displays product series based on application and wattage. The Y-axis shows 'Industrial' and 'Railway'. The X-axis represents Wattage from 10W to 1000W.

Industrial: SD-15 / 25 / 50 / 100 / 150 / 200 / 350 / 500 / 1000
Railway: RSD-30 / 60 / 100 / 150 / 200 / 300 / 500

DIN Rail Type

This roadmap chart displays product series for DIN Rail mounting. The Y-axis shows 'Industrial', 'Railway', and 'Solar PV'. The X-axis represents Wattage from 10W to 1000W.

Industrial: DDR-15 / 30 / 60
Railway: DDR-120 / 240 / 480
Solar PV: DDRH-60

PCB & On Board Type

This roadmap chart displays PCB and On-board type DC-DC converters. The Y-axis shows 'PCB Type' and 'On board Type - Non Potted' (further divided into Isolated and Non-Isolated). The X-axis represents Wattage from 10W to 1000W.

PCB Type: PSD-15 / 30 / 40
On board Type - Non Potted (Isolated): NSD05 / 10 / 15
On board Type - Non Potted (Non-Isolated): NID35 / 65 / 100

On Board Type with Potted (Industrial)

This roadmap chart details On-board type DC-DC converters with potted construction for industrial applications. The Y-axis categorizes by package type (SMD, SIP, DIP, 1"x1", 2"x1", 2"x2", Brick). The X-axis represents Wattage from 0.5W to 150W.

SMD: 1~3W (Series: SBTN 01, SFTN01/02, DETN01/02, SMT01)
SIP: 1~9W (Unregulated: SMU01/02, SPU01/DPU01, SPUN/DPUN02, SPRN/DPRN01, SPA01; Regulated: SPAN/DPAN02; SPBW/DPBW03,06; SPB/DPB09)
DIP: 1~20W (Unregulated: SRS, SUS, SMA01; Regulated: SLC/DLC03, SCWN/DCWN03, 06; SCW/DCW08,12; SCW20)
1"x1": 6~30W (Series: SKM/DKM10, SKMW/DKMW06,15,20,30)
2"x1": 5~50W (Series: SLW/DLW05, SKE/DKE10, SKA/DAK15, SKA20, SKM30/50)
2"x2": 15~60W (Series: SKE/DKE15, SDM30, DKA/TKA30, SKA40/60)
Brick: 75~150W (Series: MHB-75/100/150)

On Board Type with Potted (Railway, Medical, LED)

This roadmap chart details On-board type DC-DC converters with potted construction for specific applications. The Y-axis shows 'Railway', 'Medical', and 'LED'. The X-axis represents Wattage from 0.5W to 150W.

Railway: 8~60W (1Vo: RSDW08 /10 / 20 / 40 / 60, RSDW20UW; 2Vo : RDDW08 / 10 / 20 / 40 /60, RDDW20UW)
Medical: 1~20W (1Vo: MDS01, 02, 15, 20; 2Vo: MDD01, 02)
LED: LDB-300L (300~1500mA) (Series: LDB-300~600L)
LED: (Series: LDD-300~1500L, LDD-300~1500H, LDD-350~1400H-DA)
LED: (Series: LDH-25/45/65)

Important Features

Multiple Installation Options

Installation Method and Explanation	Location	Suitable Series
Chassis mount: Terminal block wiring flexibility	In the end equipment	SD-15~1000, RSD-30~500
DIN Rail mount: Easy assembly and disassembly, integrated wiring	Power distribution cabinet DIN rails	DDR-15~480
PCB mount: Standardized mounting hole locations	In the end equipment	PSD-15~45
Board mount: Solder on end equipment PCB	Solder onto PCB as a component	NSD05~15, NID35~100, Module Type -0.5~150W

Multiple Input Voltages

Input Voltage Range	Application	Suitable Products
±10% (4.5 ~ 5.5Vdc, 10.8 ~ 13.2Vdc, 21.6 ~ 26.4Vdc, 43.2 ~ 52.8Vdc)	ITE Equipment: Isolation and filter applications. Not suitable for unstable input.	0.5~3W: SRS, SBTN/SFTN/DETN, MDS/MDD, SPU/SPUN, SMA, SMU
2:1 (9~18Vdc, 18~36Vdc, 36~75Vdc)	ITE/industrial/medical: Voltage conversion applications.	1~500W: SPA/SPAN/SPB, SCW/DCW, SLC/DLC, SLW/DLW, SKM/DKMSKE/DKE, SKA/DKA/TKA, SDM, MHB, LDH, PSD, SD-15~350, RSD-100~500
4:1 (9~36Vdc, 18~75Vdc, 40~160Vdc)	ITE/industrial: Voltage conversion applications that require wider input range than 2:1.	3~1000W: NSD, SCWN/DCWN, SPBW/DPBW, SKMW/DKMW, RSDW/RDDW, LDD, LDB, RSD-30~60, SD-500~1000
10:1 (150~1500Vdc)	Photo Voltaic (P.V.): DC input comes from solar panel arrays.	60W: DDRH
18:1 (9~160Vdc)	Railway transportation: 24/48/72/96/110Vdc railway voltages.	20W: RSDW-UW, RDDW-UW

Multiple I/O Isolation Voltage

IP-OP Isolation	Application	Suitable Products
1~1.5KV	Information / communication equipment...	0.5~1000W: NSD, PSD, SD, SRS, SUS, SPU/SPRN, SPAN/DPAN, SPBW/DPBW, SCW/DCW, SKMW/DKMW, SLW/DLW, SKE/DKE, SKA/DKA, MHB.....
3KV	Industrial apparatus, electric meters...	1~60W: SBTN/SFTN/DETN, SPU, SCWN/DCWN, RSDW/RDDW
4KV	Railway...	8~500W: RSD, DDR
6KV	Medical, harsh environment...	1~20W: MDS/MDD

Safety for Multiple Industries

Series	Safety	Application
PSD-15~45, NSD05~15, NID35~100, RSD-30~500, DDR-15~480	ITE 62368-1 (cURus, CB, CE, EAC)	[Image: Server racks]
RSDW08~60, RDDW08~60, RSD-30~500, DDR-120~480	Railway EN50155 (CE, EAC)	[Image: Train interior/driver]
MDD01~02, MDS01~15	Medical 60601-1 (cURus, CE, EAC)	[Image: Medical equipment/lab]
LDD, LDB, LDH	LED EN55015 (CE, EAC)	[Image: LED grow lights]

MEAN WELL DC-DC Advantages

Brand Awareness

Well-known brand
Transparent product information
Comprehensive marketing activities
Your Reliable Power Partner

Sales Channel

Global channel sales
Quick and localized sales services
Standard products available from stock (30 days L/T for large quantity)

Complete Product

Flexible installation: Chassis Mount, DIN Rail Mount, PCB Mount, Board Mount
Complete Wattage: 0.5~1000W
Complete Models: Input : ±10%, 2:1, 4:1, 10:1, 18:1; Output: Single, Dual, Triple

Application Variety

ITE
Industrial
Medical
Railway
LED lighting

DC-DC Applications

ITE & Industrial

Datacenter
Network switch
Smart meter
Transmitter
Injection molding

Railway

Ticketing machine
Message display
On-board computer
USB charger
Broadcaster

Medical

CPR device
Body composition analyzer
Scalpel
Respirator
Blood cell counter

LED Lighting

Smart streetlight
Solar powered lighting
Commercial track light
Horticultural lighting
Vehicle/ship lighting

WHY MEAN WELL

P - Products: More than 10,000 models, continues to introduce 10% new models and EOL 5% every year.
Q - Quality: High reliability and quality indicator. Post-sales failure rate decreases by 10% each year.
C - Cost: High cost-performance products, stable material price, complete supply chain integration.
D - Delivery: 24-hour delivery for small amount order. 14-day delivery for frequent purchase standard products.
S - Service: MEAN WELL Group and distributors provide services 24 hours a day, and commit to reply within 24 hours.
R - Reliable Relationship: 75% of revenue come from long-term distributors and customers.

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