Datasheet > GM38C45S8R

GM38C45S8R

更新时间： 2024-11-01 03:39:35

品牌	Logo	应用领域
GAMMA		控制器
页数	文件大小	规格书
11页	601K
描述
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

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GM38C45S8R 数据手册

Features

Description

40ns output rise and 30ns output fall times

-40° to +85°C temp. range same as standard

UC284x

GM38C4x is fixed frequency, high performance, and cur-

rent- mode PWM controllers. Gamma's BiCMOS devices

are pin compatible with standard 384x bipolar devices but

with several improvements.

Low-power BiCMOS Process

Very low start-up current (50µA typical)

Low operating current (4mA typical)

CMOS outputs with rail-to-rail swing

500kHz current-mode operation

Pin-for-pin compatible with UC3842/ 3843

/ 3844/ 3845(A)

Undervoltage lockout circuitry allows the '42 and '44 ver-

sions to start up at 14.5V and operate down to 9V, and the

'43 and '45 versions start at 8.4V with operation down to

7.6V.All versions operate up to 16V.

When compared to bipolar 384x devices operating from a

15V supply, start-up current has been reduced to 50µAtypi-

cal and operating current has been reduced to 4.0 mA typi-

cal. Decreased output rise/fall times drive larger MOSFETs,

and rail-to-rail output capability increases efficiency, espe-

cially at lower supply voltages. GM38C4x also features a

trimmed oscillator discharge current and bandgap refer-

ence.

Trimmed oscillator discharge current

UVLO with hysteresis

Low cross-conduction currents

GM38C4x denotes 8-pin plastic DIP and SOP packages.

Application

Current-mode, off-line, switched-mode

power supplies

Step-up "boost" regulators

Flyback, isolated regulators

Forward converters

Current-mode, dc-to-dc converters.

Step-down "buck" regulators

Synchronous FET converters

www.gammamicro.com

12 3 4 5 6 7...11

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