Datasheet > SG1540

SG1540

更新时间： 2024-11-28 22:43:15

品牌	Logo	应用领域
美高森美 - MICROSEMI		控制器
页数	文件大小	规格书
6页	82K
描述
OFF-LINE START-UP CONTROLLER

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中文翻译

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数据手册

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SG1540 数据手册

SG1540/SG2540/SG3540

OFF-LINE START-UP CONTROLLER

DESCRIPTION

FEATURES

The SG1540 is an integrated circuit designed to efficiently provide

start-up power from a high-voltage DC bus to a PWM control circuit

in a switching power supply. When used on the primary side, it

reduces start-up current to less than 1mA and allows any standard

PWM control circuit to be used as a primary-side controller. When

used to power a controller on the secondary side, it efficiently

eliminates the need for a heavy 50/60Hz line transformer with its

associated low frequency magnetic fields.

• Useable with primary and secondary side PWM

controllers

• Micropower comparator / switch

- Internal 2.5V bandgap reference

- 50mA power switch

• Squarewave oscillator

- 500Hz to 200KHz operation

- 200mA totem pole outputs

• Eliminates bulky, expensive 50/60 Hz transformer

• Minimizes high voltage bleeder current

• Programmable start-up voltage and hysteresis

• Internal and programmable overvoltage crowbar

latch

The circuit consists of three sections: a micropower bandgap

comparator/power switch referenced to 2.5 volts which isolates the

start-up capacitor from its load; a high frequency square-wave

oscillator with 200mA totem-pole output for driving an isolation

transformer; and a second bandgap comparator with latching

crowbar to protect against overvoltage faults while starting or

running.

• Available in 8 pin DIP, 10 pin flat pack, and 16 pin

widebody SOIC

HIGH RELIABILITY FEATURES - SG1540

The SG1540 is specified for operation over the full military ambient

temperature range of -55°C to 125°C. The SG2540 is character-

ized for the industrial range of -25°C to 85°C, and the SG3540 is

designed for the commercial range of 0°C to 70°C.

♦ Available to MIL-STD - 883

♦ LMI level "S" processing available

BLOCK DIAGRAM

4/90 Rev 1.1 2/94

LINFINITY Microelectronics Inc.

11861 Western Avenue ∞ Garden Grove, CA 92841

(714) 898-8121 ∞ FAX: (714) 893-2570

12 3 4 5 6

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