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| 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 RS + 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 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 Accuracy Voltage Stability Temp Stability Amplitude Error Amplifier Section Input Voltage Input Bias Current AVOL Unity Gain Bandwidth PSRR Output Sink Current Output Source Current Vout High Vout Low lsink lsource VOH VOL VI(EA) lBIAS 2Vo4V Tj=25(note 2) 12Vcc25V Vpin2=2.7V, Vpin 1=1.1V Vpin 2=2.3V, Vpin 1=5V Vpin 2=2.3V, RL=15k to GND Vpin 2=2.7V, Vpin 1=1.1V 2 of 4 60 0.7 60 2 -0.5 5 Vpin 1=2.5V 2.42 2.50 -0.3 90 1 70 6 -0.8 6 0.7 1.1 6.0 2.58 -2 V A dB mHz dB mA mA V V Vosc f f/Vcc SYMBOL VREF VREF VREF TEST CONDITIONS Tj=25, Io=1mA 12VIN25V MIN 4.90 TYP 5.00 6 6 50 5 MAX 5.10 20 25 6 25 -180 57 1 UNIT V mV MV mV mV mA kHz % % V 1lo=20mA 10Hzf10kHz, Tj=25(note 2) Ta=25, 1000Hrs (note 2) Vose lsc Tj=25 12Vcc25V TminTATmax (note 2) Vpin 4 peak to peak -30 47 -100 52 0.2 5 1.7 WuXi YouDa Electronics Co., Ltd Website: www.e-youda.com YOUDA INTEGRATED CIRCUIT Current Sense Section Gain Maximum Input Signal PSRR Input Bias Current Delay to Output Output Section Output Low Level VOL VOH tR tF lsink=20mA lsink=200mA lsource=20mA lsource=200mA Tj=25, CL=1nF (note 2) Tj=25, CL=1nF(note 2) Vcc=5V, lsink=10mA VTH(ST) VOPR(min) 14.5 8.5 13 12 0.1 1.5 13.5 13.5 50 50 0.7 16 10 lBIAS Vpin 3=0 to 2V Gv VI(MAX) (note 3, 4) Vpin 1=5V(note 3) 12Vcc25V 2.85 0.9 3 1 70 -2 150 YD3842 3.15 1.1 -10 300 0.4 2.2 V/V V dB A ns V V V V Output High Level Rise Time Fall Time UVLO Saturation 150 150 1.2 17.5 11.5 ns ns V V V Under-Voltage lockout Output Section Start Threshold Min. Operating Voltage After Turn On PWM Section Maximum Duty Cycle Minimum Duty Cycle Total Standby Current Start-up Current Operating Supply Current Vcc Zener Voltage lST Icc(OPR) Vz Vpin 2=Vpin 3=0V Icc=25mA 0.5 11 34 1 17 mA mA V D(MAX) D(MIN) 95 07 100 0 % % APPLICATION CIRCUIT Vref 4.7 RT 100 1 2 3 4 CT 8 7 6 5 0.1 A 0.1 VCC Error Amp Adjust 4.7 Isense Adjust 5 1 /1 OUTPUT WuXi YouDa Electronics Co., Ltd 3 of 4 Website: www.e-youda.com YOUDA INTEGRATED CIRCUIT OUTLINE DRAWING YD3842 WuXi YouDa Electronics Co., Ltd 4 of 4 Website: www.e-youda.com |
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