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UC3856 Datasheet(PDF) 4 Page - E-Tech Electronics LTD |
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UC3856 Datasheet(HTML) 4 Page - E-Tech Electronics LTD |
4 / 9 page UC3856 Preliminary LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 4 of 9 www.unisonic.com.tw QW-R103-077.a ABSOLUTE MAXIMUM RATINGS (TA=25°C, VDD =15V, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VDD 30 V Input Voltage to FB Pin VFB -0.3~7 V Input Voltage to CS Pin VSENSE -0.3~7 V Junction Temperature TJ +150 C Operating Temperature TOPR -40~+125 °C Storage Temperature TSTG -50~+150 C Notes: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. OPERATING RANGE PARAMETER SYMBOL RATINGS UNIT Supply Voltage VDD 10~26 V ELECTRICAL CHARACTERISTICS (TA=25°C, VDD=15V, RI =100KΩ,unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT HV START Supply Current from ST Pin IST 2 2.8 5 mA Start Pin Leakage Current After Startup IEAKAGE 10 μA SUPPLY SECTION Start Up Current ISTR VDD=VDD(ON)-0.1V 5 20 μA IC Operating current IOP VFB=3.5V 1.5 5 mA VDD Over Voltage Protection (Latchoff) VDD_CLAMP I_CLAMP=20mA 26.5 2.80 29.5 mA UNDER-VOLTAGE LOCKOUT SECTION Start Threshold Voltage VTHD(ON) 12 13 14 V Min. Operating Voltage VDD(MIN) 5.5 6.5 7.5 V CONTROL SECTION VFB Open Loop Voltage Level VFB-OPEN 5.15 5.45 5.75 V PWM Input Gain AVCS ∆VFB/∆VCS 3 V/V Burst-Mode Out FB Voltage VFB(OUT) VSENSE =0 1.87 V Reduce-Frequency end FB Voltage VFB(END) VSENSE =0 2.5 V Burst-Mode Enter FB Voltage VFB(IN) VSENSE =0 1.56 V Switch Frequency Normal FSW VFB=3.5V, RI=100KΩ 55 62 67 KHz Power-Saving Before enter burst mode 22 KHz Duty Cycle DMAX VFB=3.5V, VSENSE=0 75 % Frequency Hopping FJ(SW) -4 +4 % Frequency VDD Stability FDV VDD=12V~20V 5 % Frequency Temperature Stability FDT T=-20~100°C 1.5 5 % Feedback Resistor RFB 11 KΩ PROTECTION SECTION VCC Over Voltage Protection Threshold VOVP 27.2 V FB PIN Over Load Protection Threshold VOLP 4.0 4.5 5.5 V Over Load Protection Delay-Time TDelay VFB=3~5V (OLP) 98 mS OTP threshold T(THR) VFB=4.2V 145 °C CURRENT LIMITING SECTION Over Current Flat Threshold Voltage VCS VFB=4.2V 0.65 0.75 0.85 V Lead Edge Blanking Time TLEB 400 ns DRIVER OUTPUT SECTION Output Voltage Low State VOL VDD=16,IO=-20mA 0.8 V Output Voltage High State VOH VDD=16,IO=20mA 10 V Output Voltage Rise Time tR CL=1.0nF 110 ns Output Voltage Fall Time tF CL=1.0nF 70 ns |
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