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UC2843B PDF预览

UC2843B

更新时间: 2024-11-23 08:26:27
品牌 Logo 应用领域
友顺 - UTC 控制器
页数 文件大小 规格书
9页 205K
描述
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS

UC2843B 数据手册

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UNISONIC TECHNOLOGIES CO., LTD  
UC2843B  
Preliminary  
LINEAR INTEGRATED CIRCUIT  
HIGH-PERFORMANCE  
CURRENT-MODE PWM  
CONTROLLERS  
„
DESCRIPTION  
The UTC UC2843B provides off-line or DC-DC fixed-frequency  
current-mode control design with minimum external components.  
Internally-implemented circuits include an under-voltage lockout  
(UVLO) and a precision reference with accuracy at the error amplifier  
input. The UTC UC2843B also contain internal circuits which include  
a pulse width modulation (PWM) comparator providing current-limit  
control, logic ensuring latched operation, and a totem-pole output  
stage designed to source or sink high-peak current. The output  
stage is low when it is in off-state condition and suitable for  
N-channel MOSFETs driving.  
The UTC UC2843B also has following advantages: the start-up  
current lower than 0.5mA while the oscillator discharge current is  
specified to 8.3mA (Typ.). In UVLO conditions, the output has a  
maximum saturation voltage of 1.2V when sinking 10mA@VCC = 5V.  
The typical UVLO threshold of the UTC UC2843B is 8.4V (on)  
and 7.6V (off) and can operate to duty cycles approximately 100%.  
„
FEATURES  
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Current mode operation:500 kHz  
Low start-up current value<0.5mA  
Latching PWM for cycle-by-cycle current limiting  
Trimmed oscillator discharge current  
Automatic feed-forward compensation  
Internally trimmed reference with UVLO  
High-current totem-pole output UVLO with hysteresis  
Double-pulse suppression  
Halogen free  
„
ORDERING INFORMATION  
Ordering Number  
UC2843BG-S08-R  
Package  
SOP-8  
Packing  
Tape Reel  
www.unisonic.com.tw  
Copyright © 2009 Unisonic Technologies Co., Ltd  
1 of 9  
QW-R103-048.a  

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