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參數資料
| 型號： | SG2540 |
| 廠商： | Microsemi Corporation |
| 英文描述： | OFF-LINE START-UP CONTROLLER |
| 中文描述： | 非行開始，向上控制器 |
| 文件頁數： | 1/6頁 |
| 文件大小： | 78K |
| 代理商： | SG2540 |
4/90 Rev 1.1 2/94
Copyright
1994
L
IN
F
IN
ITY
Microelectronics Inc.
11861 Western Avenue
∞
∞
Garden Grove, CA 92841
(714) 898-8121
∞
FAX: (714) 893-2570
1
SG1540/SG2540/SG3540
OFF-LINE START-UP CONTROLLER
FEATURES
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
Available in 8 pin DIP, 10 pin flat pack, and 16 pin
widebody SOIC
HIGH RELIABILITY FEATURES - SG1540
Available to MIL-STD - 883
LMI level "S" processing available
DESCRIPTION
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.
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.
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.
BLOCK DIAGRAM
相關PDF資料 |
PDF描述 |
|---|---|
| SG2540DW | OFF-LINE START-UP CONTROLLER |
| SG2540M | OFF-LINE START-UP CONTROLLER |
| SG2540Y | OFF-LINE START-UP CONTROLLER |
| SG1825 | HIGH - SPEED CURRENT - MODE PWM |
| SG3825CDW | HIGH - SPEED CURRENT - MODE PWM |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SG2540DW | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:OFF-LINE START-UP CONTROLLER |
| SG2540M | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:OFF-LINE START-UP CONTROLLER |
| SG2540Y | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:OFF-LINE START-UP CONTROLLER |
| SG2543 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:POWER SUPPLY OUTPUT SUPERVISORY CIRCUIT |
| SG2543DW | 制造商:Microsemi Corporation 功能描述:SG2543DW - Bulk |
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