UCC1570J

更新时间： 2024-11-25 21:54:35

品牌	Logo	应用领域
德州仪器 - TI		脉冲
页数	文件大小	规格书
9页	342K
描述
Low Power Pulse Width Modulator

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中文翻译

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数据手册

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UCC1570J 数据手册

UCC1570

UCC2570

UCC3570

Low Power Pulse Width Modulator

FEATURES

DESCRIPTION

• Low Power BiCMOS Process

The UCC1570 family of pulse width modulators is intended for application

in isolated switching supplies using primary side control and a voltage

mode feedback loop. Made with a BiCMOS process, these devices feature

low startup current for efficient off-line starting with a bootstrapped low volt-

age supply. Operating current is also very low; yet these devices maintain

the ability to drive a power MOSFET gate at frequencies above 500kHz.

• 85µA Start-up Current

• 1mA Run Current

• 1A Peak Gate Drive Output

• Voltage Feed Forward

• Programmable Duty Cycle Clamp

• Optocoupler Interface

• 500kHz Operation

Voltage feedforward provides fast and accurate response to wide line volt-

age variation without the noise sensitivity of current mode control. Fast cur-

rent limiting is included with the ability to latch off after a programmable

number of repetitive faults has occurred. This allows the power supply to

ride through a temporary overload, while still shutting down in the event of

a permanent fault. Additional versatility is provided with a maximum duty

cycle clamp programmable within a 20% to 80% range and line voltage

sensing with a programmable window of allowable operation.

• Soft Start

• Fault Counting Shutdown

• Fault Latch Off or Automatic Restart

BLOCK DIAGRAM

CLK

CLOCK

GENERATOR

FREQ

4.5V

RAMP

VALLEY

VFWD

SLOPE

RAMP

10 I3

12 VREF

GENERATOR

GND

RAMP

LATCH

15V

10 I4

13/9V

ISET

RAMP

PEAK

HIGH

LINE

VCC

LOW

LINE

OUT

FEEDBK

SOFTST

R^D

PWM

LATCH

PGND

PWM

CURRENT

LIMIT

CURLIM

0.2V

CLK

S^D

COUNT

SHUTDOWN

LATCH

SHUTDOWN

0.6V

04/99

12 3 4 5 6 7...9

中文翻译

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