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DI-53

更新时间： 2024-11-21 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	378K
描述
50 W DC-DC Dual Output Converter

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中文翻译

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DI-53 数据手册

Design Idea DI-53

™

DPA-Switch

50 W DC-DC Dual Output Converter

Topology

Device

Power Output

Input Voltage

Output Voltage

Application

Forward Sync. Rect.

Telecom

50 W

36-75 VDC

DPA425R

5 V & 3.3 V

recirculate the transformer leakage energy during normal

operation, with Zener VR1 providing absolute clamping for

transient conditions.

Design Highlights

• High efficiency: 90% at 36 VDC using synchronous

rectification

CapacitorC21chargesthegateofQ2,theforwardsynchronous

rectifier MOSFET of the 5 V output. Resistor R21 limits gate

oscillation and R22 provides gate pull-down. Zener diode

VR20 limits the Q2 gate voltage during conduction and also

reverse charges C21 during the Q2 off time. The same drive

technique is used for the forward synchronous rectifier

MOSFET (Q4) of the 3.3 V output (with C22, R24, R25, and

VR21).

• Dual output with tight cross-regulation ±4% from zero to

full load on both outputs

• Output overload, open loop and thermal protection

• 300 kHz switching frequency to allow sufficient

transformer reset time with sync rectification

• 3.85 x 2.25 x 0.6 inch (~9.62 W/in³)

Operation

DPA-Switchgreatlysimplifiesthedesigncomparedtoadiscrete

implementation.Thisdesignusesacoupledoutputinductorand

synchronous rectification to achieve excellent cross-regulation

and high efficiency.

MOSFETs Q1 and Q3 are driven via resistors R23 and R26

from the transformer (T1) reset voltage and operate only

when Q2 and Q4 are off. Diodes D20 and D21 provide a

conductionpathfortheoutputinductor(L4)currentwhenthe

transformer reset is complete.

Resistor R1 programs the under/over voltages and linearly

reduces the maximum duty cycle with input voltage to prevent

core saturation during load transients. Components D1, D2, C9

and L2 implement a resonant clamp circuit to catch and

A winding on the coupled inductor L4, along with diode D4

and capacitor C9, provide the DPA-Switch bias voltage.

5 V, 6 A

(8 A pk)

3.5 µH

9,10

7,8

3,4

R23

10 Ω

8,9

D20

3.3 V, 6 A

(8 A pk)

R26

10 Ω

1,2

4,5

+ V

36-75 VDC

1 µH

2.5 A

R25

10 kΩ

C21-C22

4700 pF

R21

10 Ω

D21

R20

3.3 Ω

VR21

15 V

619 kΩ

ES1D

2,3

R24

10 Ω

C23-C26

100 µF

10 V

C27

1 µF

C28

1 µF

RTN

6,7

150 pF

200 V

10 kΩ

C20

3.3 nF

R22

VR20

15 V

1 nF

1.5 kV

R10

R12

15.9 kΩ

220 µH

8.66 kΩ

10 kΩ

C1-C3

1 µF

100 V

PC267

N1T

4.7 µF

16 V

DPA-Switch

C16

100 nF

BAV19WS

DPA425R

R12

150 Ω

5.1 Ω

CONTROL

220 Ω

ES1D

C15

10 µF

10 V

C14

1 µF

1.0 Ω

VR1

0.22 µF

SMBJ

150 A

68 µF

10 V

LM431

AIM3X

R11

10.0 kΩ

15 kΩ

-V

PI-3561-072203

Figure 1. DPA425R - 50 W, 5 V, 6 A and 3.3 V, 6 A DC-DC Converter.

July 2003

DI-53

www.powerint.com

中文翻译

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