UCC1570

更新时间： 2024-11-03 22:17:51

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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UCC1570 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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与UCC1570相关器件

型号	品牌	获取价格	描述	数据表
UCC15701	TI	获取价格	Advanced Voltage Mode Pulse Width Modulator
UCC15701_05	TI	获取价格	Advanced Voltage Mode Pulse Width Modulator
UCC15701J	TI	获取价格	Advanced Voltage Mode Pulse Width Modulator
UCC15701L	TI	获取价格	Advanced Voltage Mode Pulse Width Modulator
UCC15702	TI	获取价格	Advanced Voltage Mode Pulse Width Modulator
UCC15702J	TI	获取价格	Advanced Voltage Mode Pulse Width Modulator
UCC1570J	TI	获取价格	Low Power Pulse Width Modulator
UCC1570L	ETC	获取价格	Voltage-Mode SMPS Controller
UCC1580	TI	获取价格	Single Ended Active Clamp/Reset PWM
UCC1580-	TI	获取价格	Single Ended Active Clamp/Reset PWM