Datasheet > DI-56

DI-56

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	371K
描述
19.2 W DC-DC Converter

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DI-56 数据手册

Design Idea DI-56

™

DPA-Switch

19.2 W DC-DC Converter

Topology

Device

Power Output

Input Voltage

Output Voltage

Application

Flyback

Telecom

19.2 W

36-75 VDC

DPA425R

±12 V

Design Highlights

minimize fault and overload power. Drain voltage clamping

is provided by Zener diode VR1.

• Low cost 400 kHz flyback design

• ±12 V outputs at ±5% accuracy

• Highly efficient diode rectification design - 80% at 48 V

• Low component count

• Accurate line OV and UV protection

• Thermal, short circuit and output overload protection

• No current sense components

Output regulation is taken from the +12 V output. The -12 V

output is magnetically coupled. Shared regulation of +12 V

and -12 V may be used if better cross-regulation is required

between the two outputs. Optional resistor R7, diode D3 and

capacitor C16 implement a soft-finish network to slow the

rise of the output voltage at start-up, preventing overshoot.

The bias winding provides operating power to the

DPA-Switch. The regulation is fed back from the secondary

through the opto-transistor of U2. The DPA-Switch will go

into auto-restart in the event of optocoupler (U2) failure, or

outputshortcircuit. TheoptionalresistorR5andZenerdiode

VR2 provide a fail-safe output regulation path, limiting the

instantaneous output overvoltage in the event of U2 failure.

Operation

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 77% of nominal to

R14

10 Ω

1 nF

1.5 kV

1 µH

2.5 A

C30

100 µF 100 µF

16 V 16 V

C31

C32

100 µF

16 V

300 nH

+V_IN

36-75 VDC

D30

MBR360

C33

1 µF

+12 V,

0.8 A

RTN

C20

C21

D20

MBR360

300 nH

100 µF

-12 V,

0.8 A

100 µF

16 V

C22

C23

D1 BAV19W5

100 µF 1 µF

619 kΩ

C1- C2

1 µF

100 V

1 µF

100 V

16 V

R10

38 kΩ

4.7 µF

10 kΩ

DPA-Switch

C13

100 nF

180 Ω

560 Ω

DPA425R

R12

5.1 Ω

CONTROL

VR2

5.1 V

BAVAW5

1.0 Ω

220 nF

C14

1 µF

220 Ω

VR1

C16

10 µF

16 V

LM41

AIM3

SMBJ

130

R11

10.0 kΩ

10 kΩ

68 µF

10 V

-V_IN

PI-3649-081103

Figure 1. DPA425R - 19.2 W, ±12 V, 0.8 A, DC-DC Converter.

September 2003

DI-56

www.powerint.com

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