Datasheet > DI-17

DI-17

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		PC
页数	文件大小	规格书
2页	46K
描述
17 W, PC Standby

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DI-17 数据手册

Design Idea DI-17



TOPSwitch-GX

17 W, PC Standby

Application

Power Output

Input Voltage

Topology

Device

Output Voltage

Flyback

17 W

PC Standby

200-375 VDC

3.3 V / 5 V

TOP242Y

Design Highlights

voltage,thesupplyisdisableduntil195VDCisreached(this

threshold is typically the lowest operating DC input voltage

for a PC main power supply with a doubler input

configuration). On decreasing input voltage the supply

continues to operate until regulation is lost, even if this is

below the UV threshold. Once regulation is lost the input

voltage has to exceed the UV threshold again before the

supply is enabled.

• Meets Blue Angel efficiency requirements providing output

power of 3.9 W with 5 W input power

• Input undervoltage (UV) detect eliminates power-up/down

output glitches

• 132 kHz switching frequency allows small, low cost EEL19

based transformer to deliver 17 W

• Regulationderivedfrom3.3Vand5Voutputsensuring±5%

regulation on both outputs

• 15 V output for primary side circuitry

During the first 10 ms of operation internal soft-start is

enabled. The duty cycle is linearly increased from 0% to

78% and the current limit from 70% to 100%, lowering

stresses on the internal power MOSFET, clamp and output

rectifier. Diode D1 and Zener VR1 are used to clamp the

leading-edge drain-voltage spikes caused by transformer

leakage inductance. At light load, a Zener clamp provides

• Primary soft-start minimizes start-up component stresses

Operation

ThedesigninFigure1utilizestheTOP242Yandtakesadvantage

of many of the device’s features. Input UV is set at 195 VDC

using a single 3.9 MΩ resistor (R1). On increasing input

CY1

1 nF

10 µH

+V_IN

5 V, 2 A

200 - 375 VDC

C10

1000 µF

10 V

C11

100 µF

10 V

10 µH

SB540

3.3 V, 2 A

VR1

BZY97C-200

7,8

C12

1000 µF

10 V

C13

100 µF

10 V

SB540

3.9

RTN

MΩ

UF4005

15 V, 30 mA

(primary

referenced)

1 µF

BAV21

300 Ω

50 V

C1*

LTV817

0.01 µF

510 Ω

1 kV

16.2 kΩ

R10

12.1 kΩ

TOPSwitch-GX

TOP242Y

CONTROL

0.33 µF

6.8 Ω

0.1 µF

4.7 µF

10 V

TL431

47 µF

R11

10 kΩ

PI-2963-092402

* Optional

Figure 1. TOPSwitch-GX 17 W PC Standby.

November 2002

DI-17

www.powerint.com

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