Datasheet > DI-29

DI-29

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	66K
描述
25 W Flyback DC-DC Converter

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DI-29 数据手册

Design Idea DI-29

DPA-Switch

25 W Flyback DC-DC Converter

Topology

Flyback

Device

Power Output

Input Voltage

Output Voltage

Application

DC-DC Converter

25 W

36 - 75 VDC

DPA425R

7 V

Design Highlights

Resistor R3 programs the internal current limit of the

DPA425R to 50% of nominal. The larger DPA-Switch

selectionreducesconductionlosses,raisingefficiencywithout

circuit changes or increased overload power.

• Extremely low component count

• High efficiency – 85% using Schottky rectifiers

• No current sense resistor or transformer required

• Accurate input under/over voltage meets ETSI standards

• Operates to zero load with no pre-load required

• Output overload, open loop and thermally protected

• 400 kHz operation minimizes size of magnetics

Zener VR1 clamps leakage inductance spikes, keeping the

DRAIN voltage below BV_DSS. The bias supply for U1 is

provided from an auxiliary flyback transformer winding.

On the secondary, a snubber across D2 (C9, R5 and R13)

limits the secondary leakage inductance spikes generated by

diode reverse recovery. Inductor L2, C13 and C14 form a

post-filter to reduce high frequency output switching ripple.

A soft-finish network, C18, D3 and R7, eliminates output

turn-onovershoot.Theremainingcomponentsprovideoutput

voltage regulation and loop compensation.

Operation

DPA-Switchgreatlysimplifiesthedesigncomparedtoadiscrete

implementation. Resistor R1 programs 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.

6.8 Ω

2.2 nF

50 V

R13

6.8 Ω

C7 1 nF

R14

1.5 kV

10 Ω

300 nH

6 A

C10

100 µF 100 µF 100 µF

10 V 10 V 10 V

C11

C12

C13

C14

+ V

36-75 VDC 1 µH 2.5 A

C15

100 µF 100 µF

1 µF 7 V, 3.57 A

10 V 10 V

7,8

D2 MBRB2545CT

D1 BAV19WS

RTN

5,6

C23

4.7 µF

20 V

619 kΩ

R10

18.2 kΩ

10 kΩ

1 µF

100 V

1 µF

100 V

1 µF

100 V

DPA-Switch

C16

100 nF

BAV19WS

DPA425R

R12

150 Ω

5.1 Ω

CONTROL

C17

1 µF

220 Ω

C18

10 µF

10 V

1.0 Ω

VR1

15 kΩ

220 nF

SMBJ

130

68 µF

10 V

R11

LM431AIM3

10.0 kΩ

-V

PI-3012-120902

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

December 2002

DI-29

www.powerint.com

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