YD3843 Datasheet, PDF (1/4 Pages) Wuxi Youda electronics Co.,LTD – CURRENT MODE PWM CONTROL CIRCUITS

YOUDA INTEGRATED CIRCUIT
YD3843
CURRENT MODE PWM CONTROL CIRCUITS—YD3843
DESCRIPTION
The YD3843 provides the necessary features to implement off-line or DC to DC fixed frequency current mode
control schemes with a minimal external parts count.
FEATURES
*Optimized for off-line and DC to DC converts
*Low start up current(<1mA)
*Automatic feed forward compensation
*Pulse-by-Pulse current limiting
*Enhanced load response characteristic
*Under-voltage lookout with hysteresis.
*Double pulse Suppression
*High current totem pole output
*Internally trimmed band-gap reference
*500kHz operation
*Low Ro error amp
BLOCK DIAGRAM
8
7
6
5
UVL
1/2
5V
REF
S/R
VCC
+ _EA
-
1
2
1/3
1V
3
RS
OSC
4
WuXi YouDa Electronics Co., Ltd
Add: No.5 Xijin Road, National Hi-Tech Industrial Development Zone, Wuxi Jiangsu China
Tel: [phone] Fax: [phone] Website: www.e-youda.com
SHENZHEN OFFICE Tel： 86-755-83740369
Fax： 86-755-83741418
Ver 5.0
1 of 4
2006-7-10