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参数资料
| 型号： | UC3842ADX |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 1/12页 |
| 文件大小： | 104K |
| 代理商： | UC3842ADX |
2000 Fairchild Semiconductor International
www.fairchildsemi.com
Rev. 5.0
Features
Low Start Current 0.2mA (typ)
Operating Range Up To 500KHz
Cycle by Cycle Current Limiting
Under Voltage Lock Out With Hysteresis
Short Shutdown Delay Time: typ.100ns
High Current Totem-pole Output
Output Swing Limiting: 22V
Description
The UC3842A/UC3843A are fixed PWM controller for Off-
Line and DC to DC converter applications. The internal cir-
cuits include UVLO, low start up current circuit, tempera-
ture compensated reference, high gain error amplifier,
current sensing comparator, and high current totem-pole out-
put for driving a POWER MOSFET. Also UC3842A/
UC3843A provide low start up current below 0.3mA and
short shutdown delay time typ. 100ns. The UC3842A has
UVLO threshold of 16V(on) and 10V(off). The UC3843A is
8.4V(on) and 7.6V(off). The UC3842A and UC3843A can
operate within 100% duty cycle.
8-DIP
8-SOP
1
Internal Block Diagram
8
+
-
7
5
SET/
RESET
5V
VREF
Internal
Bias
Good LOGIC
2
R
S
OSCILLATOR
1
3
4
T
7
6
5
UVLO
29V
22V
1/3
Error Amp
1/2VREF
1V
C.S
Comp.
PWM
LATCH
VREF
VFB
COMP
C.S
RT/CT
OUTPUT
VCC
GND
PWR
VC
PWR
GND
UC3842A/UC3843A
SMPS Controller
相关PDF资料 |
PDF描述 |
|---|---|
| UC3843ADX | |
| UC3843ADW | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| UC3843D1X | |
| UC3844D1X | |
| UC3842D1X | |
相关代理商/技术参数 |
参数描述 |
|---|---|
| UC3842AJ | 制造商:TI 制造商全称:Texas Instruments 功能描述:Current Mode PWM Controller |
| UC3842AL-D08-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:CURRENT MODE PWM CONTROL CIRCUITS |
| UC3842AL-S08-R | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:CURRENT MODE PWM CONTROL CIRCUITS |
| UC3842AL-S08-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:CURRENT MODE PWM CONTROL CIRCUITS |
| UC3842AM | 功能描述:IC REG CTRLR BST FLYBK ISO 8-DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
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