Datasheet > DI-69

DI-69

更新时间： 2024-09-17 03:29:39

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	265K
描述
15 W Multi-Output DC-DC Converter

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中文翻译

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DI-69 数据手册

Design Idea DI-69

™

DPA-Switch 15 W Multi-Output

DC-DC Converter

Topology

Device

Power Output

Output Voltage

Application

Input Voltage

Forward

VoIP Phone

15 W

36-75 VDC

DPA424P

5 V / 7.5 V / 20 V

Design Highlights

Capacitor C1, C2 and L1 provide line ﬁltering. Resistor

R2 programs the U1 current limit. The Q22 reﬂected gate

capacitance provides optimum reset for transformer T1.

Zener VR1 clamps the peak drain voltage to a safe level

during transient conditions.

• Low component count

• Built-in accurate OV/UV with single resistor

programming

• High efﬁciency (88%) using synchronous rectiﬁcation

• Multiple outputs with good cross-regulation

• Built-in output overload, open loop and thermal protection

• 400 kHz switching frequency

Resistors R21, R22, C21 and MOSFETs Q21 and Q22 form

a capacitively coupled direct driven synchronous rectiﬁer

for the main (5 V) output. Zener diode VR21 acts both as

a clamp and as a diode to quickly recharge the Q21 drive

capacitorC21.ResistorR23holdsQ21offwhennoswitching

signal is present.

• No primary current sense resistor required

Operation

Resistor R1 programs the input under/over voltages to 33Vand

86 V. It also linearly reduces the maximum device duty cycle

(DC_MAX) with increasing input voltage, helping to prevent core

saturation during transients.

The 20 V output is generated from a ﬂyback winding on the

L2 inductor, which is rectiﬁed and ﬁltered by diode D41 and

C41. Zener VR31 and diode D32 provide a pre-load on the

7.5 V output to enhance regulation at light load.

D41

BAV19WS

20 V, 10 mA

J2-4

C41

4.7 µF, 35 V

VR31

D32

6.8 V IN4148

D31

20CJQ060

J1-1

1 µH 2.5 A

36-75 VDC

7.5 V, 0.4 A

J2-3

C31

100 µF

10 V

Q22

Si4804

C25

R4 1 µF

16 µH 4 A

C22-C24

100 µF 5 V

C21

5 V, 2.4 A

J2-2

619 kΩ

160 Ω 10 V

2.2 nF

R21

10 Ω

R22

10 Ω

Input

Voltage

BAV

19WS

RTN

J2-1

Q21

Si4804

D21

SL13

15 V

VR21

R23

10 kΩ

4.7 µF

20 V

1 µF

100 V

1 µF

100 V

R16

10.0 kΩ

R11

10 kΩ

DPA-Switch

DPA424P

PC357N1T

C12

R12

150 Ω

100 nF

R13

11 Ω

CONTROL

D11

BAV19WS

C11

R14

C13

68 nF

VR1

SMBJ

150

1.0 Ω

2.2 µF

1 kΩ

10 V

220 nF

47 µF

10 V

R15

10.0 kΩ

LM431AIM3

13.3 kΩ

PI-3799-082404

RTN

J1-2

Figure 1. 15 W DC to DC Converter using DPA424P .

DI-69

August 2004

www.powerint.com

中文翻译

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