Datasheet > DI-57

DI-57

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		转换器
页数	文件大小	规格书
2页	57K
描述
60 W DC-DC Converter

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DI-57 数据手册

Design Idea DI-57

™

DPA-Switch

60 W DC-DC Converter

Topology

Device

Power Output

Input Voltage

Output Voltage

Application

Flyback

Telecom

60 W

36-75 VDC

DPA426R

12 V

Design Highlights

minimize fault and overload power. Drain voltage clamping

is provided by diode D4 and Zener diode VR1 with optional

components C4 and R2 to provide high frequency snubbing.

• Low cost 400 kHz flyback design

• Simple Zener referenced 12 V output

• Efficiency – 82% at 36 VDC and full load

• Low component count

• Accurate line OV and UV protection

• Thermal, short circuit and output overload protection

• No current sense components

The output is rectified by diode D2 with optional high

frequencydampingfromcomponentsC9,R15andR16. The

output capacitors are alternated to share the ripple current

evenly between the Oscon capacitors (C10-14) and the

ceramic capacitors (C15-C18). A final decoupling ceramic

capacitorC19isplacedattheoutputpinsofthepowersupply.

Operation

Output regulation is taken from the +12 V output. Zener

diode VR2 is DC-biased by resistor R7 with the opto-diode

of U2 providing feedback and resistor R6 programming the

gain. OptionalcapacitorC8implementsasoft-finishnetwork

to slow the rise of the output voltage at start-up.

DPA-Switchgreatlysimplifiesthedesigncomparedtoadiscrete

implementation. Resistor R1 programs the under/over voltages

andlinearlyreducesthemaximumdutycyclewithinputvoltage

to prevent core saturation during load transients. Resistor R3

programs the DPA-Switch current limit at 85% of nominal to

R15, R16

33 Ω

1/4 W

2.2 nF

50 V

C7 1 nF

R14

1.5 kV

10 Ω

C19

1 µF

16 V

+ V

C10-C14

100 µF, 16 V (OSCON)

36-75 VDC 1 µH, 2.5 A

12 V, 5 A

RTN

9,10

VR1

SMCJ

100 A

D2 SBG3045CT

D1 BAV19WS

6,7

C15-C18

47 µF, 16 V (CERAMIC)

ES2D

C23

4.7 µF

20 V

619 kΩ

1 kΩ

PC 357N1T

1 µF

100 V

1 µF

100 V

1 µF

DPA-Switch

100 V

DPA426R

150 Ω

180 pF

200 V

CONTROL

1 µF

16 V

1.0 Ω

68 Ω

1/4 W

8.8 kΩ

220 nF

VR2

BTZ52C11

68 µF

10 V

-V

PI-3662-082603

Figure 1. DPA426R - 60 W, 12 V, 5 A DC-DC Converter.

August 2003

DI-57

www.powerint.com

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