Datasheet > DI-37

DI-37

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	227K
描述
16.5 W DC-DC Converter

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DI-37 数据手册

Design Idea DI-37

™

DPA-Switch

16.5 W DC-DC Converter

Application

Device

Power Output

Input Voltage

Output Voltage

Topology

Telecom

DPA424R

16.5 W

36-75 VDC

3.3 V

Forward Sync. Rec.

Design Highlights

voltages and linearly reduces the maximum duty cycle with

input voltage to prevent core saturation during load transients.

Resistor R3 programs the DPA-Switch current limit to 60%

of nominal to limit fault and overload power. Drain voltage

clamping is provided by Zener diode VR1. Transformer core

reset is controlled by the gate capacitance of Q1.

•

Low cost

400 kHz synchronous rectiﬁcation design

Low component count

Efﬁciency – 87% at 48 VDC

No current sense resistor or current transformer

required

Resistor R15 charges the gate of Q2, the forward synchronous

rectiﬁer MOSFET. The catch synchronous rectiﬁer MOSFET

(Q1) is directly driven by the transformer (T1) reset voltage and

operates only when Q2 is off. Diode D2 provides a conduction

path for the output inductor (L2) current when the transformer

reset is complete.

•

Output overload, open loop and thermal protection

Integrated UV meets ETSI standard

Operation

DPA-Switch greatly simpliﬁes the design compared to a

discreteimplementation. ResistorR1programstheunder/over

1 nF

R14

10 Ω

1.5 kV

1 µH

2.5 A

C13

1 µF

0805

C10

C11

C12

+V_IN

36-75 VDC

100 µF 100 µF 100 µF

3.3 V, 5 A

6.3 V 6.3 V 6.3 V

619 kΩ

R15

10 Ω

B540C

BAV

Si4800

19WS

RTN

Si4800

4.7 µF

10 kΩ

20 V

R10

C1, C2

1 µF

3.24 kΩ

100 V

DPA-Switch

C16

PC357N1T

100 nF

BAV19WS

DPA424R

CONTROL

150 Ω

R12

5.1 Ω

220 Ω

C15

C14

1 µF

10 µF

1.0 Ω

VR1

SMBJ

150

10 V

220 nF

68 µF

10 V

R11

LM431AIM3

11.1 kΩ

10.0 kΩ

V_IN

PI-3650-072004

Figure 1. DPA424R–16.5 W, 3.3 V, 5 A DC-DC Converter.

July 2004

DI-37

www.powerint.com

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