YOUDA INTEGRATED CIRCUIT
YD3842
CURRENT MODE PWM CONTROL CIRCUITS—YD3842
DESCRIPTION
The YD3842 provides the necessary features to implement off-line or 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
*Automatic Feed Forward Compensation
*Pulse-by-Pulse Current Limiting
*Under-voltage Lookout with Hysteresis
*Double Pulse Suppression
*High Current Totem Pole Output
*Internally Trimmed Band-gap Reference
*500kHz Operation
BLOCK DIAGRAM
8
7
UVL
1/2
5V
REF
S/R
VCC
6
5
R S
+
EA
-
1/3
1V
OSC
1
2
3
4
WuXi YouDa Electronics Co., Ltd
Add: No.5 Xijin Road, National Hi-Tech Industrial Development Zone, Wuxi Jiangsu China
Tel: 86-510-85205117
86-510-85205106
Fax: 86-510-85205110 Website: www.e-youda.com
SHENZHEN OFFICE Tel： 86-755-83740369
Fax： 86-755-83741418
Ver 5.0
1 of 4
2006-7-10
YOUDA [ WUXI YOUDA ELECTRONICS CO.,LTD ]
