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參數(shù)資料
| 型號(hào)： | UC3843A |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Fixed Frequency Current-Mode PWM Controller.(固定頻率電流型PWM控制器(開啟門限電壓：8.4V，關(guān)門限電壓：7.6V）) |
| 中文描述： | 固定頻率電流模式PWM控制器。（固定頻率電流型脈寬調(diào)制控制器（開啟門限電壓：8.4V，關(guān)門限電壓：7.6V）） |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 42K |
| 代理商： | UC3843A |
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
1
Internal Block Diagram
8
+
-
7
5
SET/
RESET
5V
V
REF
Internal
Bias
Good LOGIC
2
R
S
OSCILLATOR
1
3
4
T
7
6
5
UVLO
29V
22V
1/3
Error Amp
1/2V
REF
1V
C.S
Comp.
PWM
LATCH
V
REF
V
FB
COMP
C.S
R
T
/C
T
OUTPUT
V
CC
GND
PWR
V
C
PWR
GND
UC3842A/UC3843A
SMPS Controller
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3843A-BW | 制造商:FCI 制造商全稱:First Components International 功能描述:Current Mode PWM Controller Low Start-Up and Operating Current |
| UC3843AD | 功能描述:電流型 PWM 控制器 Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3843A-D08-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:CURRENT MODE PWM CONTROL CIRCUITS |
| UC3843AD1 | 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3843AD1013TR | 功能描述:IC REG CTRLR BST FLYBK ISO 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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