YD3842

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, 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 www.DataSheet4U.com YOUDA INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS(Tamb=25℃) PARAMETER Supply Voltage (Low impedance Source) Output Current Analog Inputs(pin 2, 3) Error Amplifier Output Sink Current Power Dissipation SYMBOL VCC Io VI(ANA) lSINK(EA) PD VALUE 30 ±1 -0.3 to +6.3 10 1.0 YD3842 UNIT V A V mA W ELECTRICAL CHARACTERISTICS (Tamb=25℃, VCC1=10V, Vcc2=9.5V, unless otherwise specified) PARAMETER Reference Section Output Voltage Line Regulation Load Regulation Output Noise Voltage Long Term Stability Output Short Circuit Oscillator Section Initial Acc...