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AN701

更新时间： 2022-11-25 11:11:34

品牌	Logo	应用领域
威世 - VISHAY		转换器开关控制器
页数	文件大小	规格书
20页	1116K
描述
Designing High-Frequency DC-to-DC Converters With the Si9114A Switchmode Controller

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AN701 数据手册

AN701

Vishay Siliconix

Designing High-Frequency DC-to-DC Converters

With the Si9114A Switchmode Controller

INTRODUCTION

Vishay Siliconix’s Si9100 monolithic switchmode PWM

controller established the standard for low-power, high-

efficiency dc-to-dc converters. This versatile device integrates

a number of useful features, including a power MOSFET,

high-voltage start circuitry, and low power consumption. The

Si9114A controller pushes the limits for high-frequency power

conversion by further reducing delay times and adding

additional features. As a result, dc-to-dc converters can be

designed for frequencies up to 1 MHz with simple PWM

topologies instead of the complex resonant ones.

S reduce the size of energy storage components

S increase reliability by using ceramic capacitors

S produce an all-surface-mount assembly solution

S lower system costs

S simplify the implementation of a distributed power

architecture.

Traditionally, distributed power has been regarded as costly

and impractical to implement due to the high cost of local

power conversion and the perceived complexity of resonant

power supplies. But these decision criteria are now being

changed by the availability of small-outline control ICs,

LITTLE FOOTr MOSFETs, ceramic capacitors, and new

magnetic components.

The Si9114A uses constant frequency current mode control.

By increasing the conversion frequency, power supply

designers will be able to:

OSC

SYNC

COMP

CURRENT SENSE

Error

Amplifier

B 2

Enable

OSC

Out

–

2 V

–

Ref

Gen

REF

4.6 V

–

DRIVER

OUTPUT

20 mA

1.25 V

–V

Substrate

–V

20 mA

SHUTDOWN

–

Undervoltage

Lockout

0.2 V

9.2 V

–

Figure 1 Si9114A Block Diagram

Document Number: 70575

16-Jan-01

www.vishay.com

12 3 4 5 6 7...20

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