www.
DataSheet4U.
com 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, N...

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