Datasheet > DI-51

DI-51

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	54K
描述
5 W Flyback DC-DC Converter

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DI-51 数据手册

Design Idea DI-51

DPA-Switch^™

5 W Flyback DC-DC Converter

Topology

Flyback

Device

Power Output

Input Voltage

Output Voltage

Application

DC-DC Converter

5 W

36-75 VDC

DPA423R

5 V

Design Highlights

Resistor R3 programs the internal current limit of the

DPA423Rto53%ofnominal.Thislimitstheoverloadpower

that can be delivered in a fault condition.

• Small footprint: 35 mm x 20 mm (1.4 in. x 0.8 in.)

• High efficiency flyback (>80% min.)

• 8.8 W per cu. in.

Zener VR1 clamps the leakage inductance spikes to keep the

DRAIN voltage at a safe level. The bias supply for U1 is

provided from the auxiliary flyback transformer winding

(pins 2 and 4), rectified and filtered by diode D1 and

capacitor C23.

• Low component count

• Accurate line OV and UV protection

• Thermal, short circuit and output overload protection

• No current sense components

A snubber for diode D2 (capacitor and resistor) can be used,

but was not needed in this application. Inductor L2 and

capacitor C12 form a post filter to reduce high frequency

output switching ripple. A soft-finish network, C18, D3 and

R7, eliminates output turn-on overshoot. The remaining

components provide output voltage regulation and loop

compensation.

Operation

DPA-Switchgreatlysimplifiesthedesigncomparedtoadiscrete

implementation. Resistor R1 sets the input under/over voltages

to 33 V and 86 V, respectively. Including tolerances, these

thresholds guarantee the converter is operational between 36 V

and 75 V without the cost of additional line sense components.

C7 1 nF

R14

1.5 kV

10 Ω

300 nH

6 A

C12

100 µF

10 V

C10

C11

+ V

36-75 VDC

D2 SL23

1A/30 V

10 µH

100 µF 100 µF

0.85 A

5 V, 1 A

RTN

10 V 10 V

7,8

5,6

D1 BAV19WS

C23

4.7 µF

20 V

619 kΩ

R10

18 kΩ

10 kΩ

0.22 µF

100 V

1 µF

100 V

DPA-Switch

C16

220 nF

BAV19WS

DPA423R

R12

150 Ω

5.1 Ω

CONTROL

C17

1 µF

220 Ω

C18

10 µF

10 V

1.0 Ω

VR1

14.4 kΩ

47 nF

SMBJ

150 A

LM431AIM3

68 µF

10 V

R11

18 kΩ

-V

PI-3547-062403

Figure 1. DPA-Switch Flyback DC-DC Converter.

July 2003

DI-51

www.powerint.com

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