UCC38C40

更新时间： 2024-11-21 22:39:59

品牌	Logo	应用领域
德州仪器 - TI		信息通信管理控制器
页数	文件大小	规格书
19页	295K
描述
BICMOS LOW POWER CURRENT MODE PWM CONTROLLER

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UCC38C40 数据手册

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SLUS458C − AUGUST 2001 − REVISED SEPTEMBER 2003

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FEATURES

DESCRIPTION

Enhanced Replacement for UC3842A Family

With Pin-to-Pin Compatibility

UCC38C4x family is a high-performance current-

mode PWM controller. It is an enhanced BiCMOS

version with pin-for-pin compatibility to the

industry standard UC384xA family and UC384x

family of PWM controllers. In addition, lower

startup voltage versions of 7 V are offered as

UCC38C40 and UCC38C41.

1-MHz Operation

50-µA Standby Current, 100-µA Maximum

Low Operating Current of 2.3 mA at 52 kHz

Fast 35-ns Cycle-by-Cycle Overcurrent

Limiting

Providing necessary features to control fixed

frequency, peak current-mode power supplies,

this family offers the following performance

advantages. The device offers high-frequency

operation up to 1 MHz with low start-up and

operating currents, thus minimizing start-up loss

and low operating power consumption for

improved efficiency. The device also features a

very fast current-sense-to-output delay time of

35 ns and a 1 A peak output current capability

with improved rise and fall times for driving large

external MOSFETs directly.

1-A Peak Output Current

Rail-to-Rail Output Swings with 25-ns Rise

and 20-ns Fall Times

1% Initial Trimmed 2.5-V Error Amplifier

Reference

Trimmed Oscillator Discharge Current

New Under Voltage Lockout Versions

MSOP-8 Package Minimizes Board Space

APPLICATIONS

Switch-Mode Power Supplies

The UCC38C4x family is offered in 8-pin

packages, MSOP (DGK), SOIC (D) and PDIP (P).

dc-to-dc Converters

Board Mount Power Modules

FUNCTIONAL BLOCK DIAGRAM

5.0 V

VREF

VDD

GND

UVLO

VREF

GOOD LOGIC

RT/CT

OSC

(NOTE)

OUT

2.5 V

ERROR AMP

COMP

Note: Toggle flip−flop used only in UCC38C41, UCC38C44, and UCC38C45.

UDG−99139

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

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UCC38C40 替代型号

型号	品牌	替代类型	描述	数据表
UCC28C40	TI	功能相似	BICMOS LOW POWER CURRENT MODE PWM CONTROLLER

与UCC38C40相关器件

型号	品牌	获取价格	描述	数据表
UCC38C40D	TI	获取价格	BICMOS LOW POWER CURRENT MODE PWM CONTROLLER
UCC38C40DG4	TI	获取价格	BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLER
UCC38C40DGK	TI	获取价格	BICMOS LOW POWER CURRENT MODE PWM CONTROLLER
UCC38C40DGKG4	TI	获取价格	BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLER
UCC38C40DGKR	TI	获取价格	BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLER
UCC38C40DGKRG4	TI	获取价格	BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLER
UCC38C40DR	TI	获取价格	BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLER
UCC38C40DRG4	TI	获取价格	BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLER
UCC38C40P	TI	获取价格	BICMOS LOW POWER CURRENT MODE PWM CONTROLLER
UCC38C40PG4	TI	获取价格	BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLER

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