Maker : Wuxi Youda electronics
Part No. : YD3843

  Datasheet PDF : YD3843.pdf
  Cross Reference : YD3843 Cross Reference
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Shortcut : YD3842  YD3843 

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www.DataSheet4U.com 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 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 Fax： 86-755-83741418 SHENZHEN OFFICE Tel： 86-755-83740369 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) Supply Voltage(Icc＜30mA) Output Current Output Energy(Capacitive Load) Analog Inputs(pin 2, 3) Error Amplifier Output Sink Current Power Dissipation Lead Temperature Storage Temperature Note 1:Ta＞25℃, PD derated with 8mW/℃. VI(ANA) lSINK(EA) PD Tlead Tstg SYMBOL Vcc Vcc Io VALUE 30 Self Limiting ±1 5 -0.3 to +6.3 10 At Tamb≤25℃ 1.0 300 -65—+150 YD3843 UNIT V V A μJ V mA W ℃ ℃ ELECTRICAL CHARACTERISTICS (Vcc=15V, RT =10kΩ, CT =3.3nF, Tamb=0℃～70℃, 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 lsink VI(EA) lBIAS 2≤Vo≤4V Tj=25℃(note 2) 12≤Vcc≤25V Vpin2=2.7V, Vpin 1=1.1V 60 0.7 60 2 Vpin 1=2.5V 2.42 2.50 -0.3 90 1 70 6 6.0 2.58 -2 V μA dB mHz dB mA Vosc f △ △ SYMBOL VREF △ △ TEST CONDITIONS Tj=25℃, Io=1mA 12≤VIN≤25V 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 VREF VREF 1≤lo=20mA 10Hz≤f≤10kHz, Tj=25℃(note 2) Ta=25℃, 1000Hrs(note 2) Vose lsc Tj=25℃ 12≤Vcc≤25V Tmin≤TA≤Tmax(note 2) Vpin 4 peak to peak -30 47 -100 52 0.2 5 1.7 f/ Vcc WuXi YouDa Electronics Co., Ltd 2 of 4 Website: www.e-youda.com www.DataSheet4U.com YOUDA INTEGRATED CIRCUIT Output Source Current Vout High Vout Low 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) 7.8 7.6 13 12 0.1 1.5 13.5 13.5 50 50 0.7 8.4 8.0 lBIAS Vpin 3=0 to 2V Gv VI(MAX) (note 3, 4) Vpin 1=5V(note 3) 12≤Vcc≤25V 2.85 0.9 3 1 70 -2 150 lsource VOH VOL Vpin 2=2.3V, Vpin 1=5V Vpin 2=2.3V, RL=15kΩ to GND Vpin 2=2.7V, Vpin 1=1.1V -0.5 5 -0.8 6 0.7 YD3843 mA V 1.1 V 3.15 1.1 V/V V dB -10 300 0.4 2.2 μA ns V V V V Output High Level Rise Time Fall Time UVLO Saturation 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 150 150 1.2 9.0 8.4 ns ns V V V Under-Voltage Lockout Output Section D(MAX) D(MIN) 95 07 100 0 % % lST Icc(OPR) Vz Vpin 2=Vpin 3=0V Icc=25mA 0.5 11 34 1 17 mA mA V WuXi YouDa Electronics Co., Ltd 3 of 4 Website: www.e-youda.com www.DataSheet4U.com YOUDA INTEGRATED CIRCUIT APPLICATION CIRCUIT YD3843 Vref 4.7ＫΩ RT 100ＫΩ 1 2 3 4 CT 8 7 6 5 0.1μＦ A 0.1μＦ VCC Error Amp Adjust 4.7ＫΩ Isense Adjust 5κΩ 1κΩ /1Ｗ OUTPUT OUTLINE DRAWING WuXi YouDa El...

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