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参数资料
| 型号： | UC3845DX |
| 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, PDSO14 |
| 封装： | SOP-14 |
| 文件页数： | 1/20页 |
| 文件大小： | 249K |
| 代理商： | UC3845DX |
2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
Features
Low Start up Current
Maximum Duty Clamp
UVLO With Hysteresis
Operating Frequency up to 500KHz
Description
The UC3842/UC3843/UC3844/UC3845 are fixed
frequencycurrent-mode PWM controller. They are specially
designed for Off-Line and DC to DC converter applications
with minimum external components. These integrated
circuits feature a trimmed oscillator for precise duty cycle
control, a temperature compensated reference, high gain
error amplifier, current sensing comparator and a high
current totempole output for driving a Power MOSFET. The
UC3842 and UC3844 have UVLO thresholds of 16V (on)
and 10V (off). The UC3843 and UC3845 are 8.5V(on) and
7.9V (off). The UC3842 and UC3843 can operate within
100% duty cycle. The UC3844 and UC3845 can operate
with 50% duty cycle.
8-DIP
14-SOP
1
8-SOP
1
Internal Block Diagram
UC3842/UC3843/UC3844/UC3845
SMPS Controller
* NORMALLY 8DIP/8SOP PIN NO.
* ( ) IS 14SOP PINNO.
* TOGGLE FLIP FLOP USED ONLY IN UC3844, UC3845
相关PDF资料 |
PDF描述 |
|---|---|
| UC3842DX | |
| UC3844ADW | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| UC3902DTRG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| UC5306X | T-1 3/4 SINGLE COLOR LED, BLUE GREEN, 5 mm |
| UCC2919DTR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| UC3845G-D08-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845G-S08-R | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845G-S08-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845J | 制造商:Texas Instruments 功能描述:Current Mode PWM Controller 1A 8-Pin CDIP Tube |
| UC3845L-D08-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
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