Datasheet > DI-31

DI-31

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 V, 70 W DC-DC Converter with Synchronous Rectification

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

DI-31 数据手册

Design Idea DI-31

DPA-S w it c h^™5 V, 70 W DC-DC

Converter with Synchronous Rectification

Topology

Forward

Device

Power Output

Input Voltage

Output Voltage

Application

DC-DC Converter

70 W

36-75 VDC

DPA426R

5 V

appliedtoMOSFETsQ1toQ6, eliminatingtheneedforgate

voltage clamp circuitry. The self-driven synchronous

rectification configuration is therefore very simple, with R4

to R6 filtering voltage spikes at the gates of Q1, Q2 and Q3

and D4 preventing the body diodes of Q4, Q5 and Q6 from

conducting.

Design Highlights

• Extremely low component count

• High efficiency, 90% using synchronous rectification

• No current sense resistor or current transformer required

• Output overload, open loop and thermal protection

• Accurate input under/overvoltage meets ETSI standards

• 300 kHz switching frequency – optimizes efficiency using

simple self-driven synchronous rectification

CapacitorC9,diodesD1-D2,andinductorL2formaresonant

snubber that recycles leakage and magnetizing energy stored

in T1, and also helps to reset T1. Zener diode VR1 provides

ahardvoltagelimitandonlyconductsduringoutputtransient

and overload conditions. Capacitor C12 and Resistor R7

damp secondary switching spikes and help to reset T1.

Operation

The 70 W converter shown in Figure 1 benefits from many of

the DPA-Switch integrated features. In particular, no external

current sense components are required. In a discrete

implementation,anexpensivecurrenttransformerandanumber

of additional components would increase the cost of this

converter significantly.

Key Design Points

• For nominal undervoltage set point V_UV:

R1 = (V_UV- 2.35 V)/50 µA. V_OV= (R1 x 135 µA) + 2.5 V.

• Locate C10, C11, and R3 close to the U1 CONTROL pin,

with ground connections returned to SOURCE pin.

R1 programs the input UV/OV thresholds. The tight tolerance

of the UV/OV thresholds limits the range of gate drive voltages

C7 1 nF

C13, C14,

1.5 kV

C15, C16, C17

100 µF 10 V

(x5)

3.8 µH

20 A

C18, C19

100 µF

10 V

+ V

36-75 VDC

1 µH

Q4-Q6

SI4842DY

R4-R6

10 Ω

5 V, 14 A

2.5 A

9,10

6,7

100 nH

20 A

C20

1 µF

10 V

ESD1

619 kΩ

42CTQ30S

RTN

Q1-Q3

SI4842DY

C12 2.2 nF, 50 V

1 Ω

150 pF

200 V

R13

R15

10.0 kΩ

BAV19WS

2.2 mH

40 mA

C3, C4,

C5, C6

1 µF 100 V

(x4)

C1, C2

1 µF

100 V

10 kΩ

BAV19WS

C22

100 nF

1 µF

25 V

R11

R10

DP A-S w it c h

150 Ω

5.1 Ω

CCOONNTTRROOLL

DPA426R

R14

220 Ω

220 µH

PC357N1T

C23

10 µF

C21 1 µF

10 V

1.0 Ω

VR1

SMBJ

150

C10

220 nF

LM431AIM3

R16

10.0 kΩ

C11

68 µF

10 V

ESD1

6.8 kΩ

-V

1 %

PI-3375-121602

Figure 1. DPA426 70 W, 5 V, 14 A DC-DC Converter.

December 2002

DI-31

www.powerint.com

下载PDF

与DI-31相关器件

型号	品牌	描述	获取价格	数据表
DI-33	POWERINT	Wide Range DVD Supply: <50 mW No-load Consumption	获取价格
DI-34	POWERINT	5 W Universal Adapter	获取价格
DI3423	ETC	TRANSISTOR \| BJT \| PAIR \| PNP \| 15V V(BR)CEO \| CHIP	获取价格
DI3424	ETC	TRANSISTOR \| BJT \| PAIR \| PNP \| 15V V(BR)CEO \| CHIP	获取价格
DI35	ETC	16 W Audio Amplifier Power Supply	获取价格
DI-35	POWERINT	16 W Audio Amplifier Power Supply	获取价格