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UC3844G-S08-R Scheda tecnica(PDF) 5 Page - Unisonic Technologies |
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UC3844G-S08-R Scheda tecnica(HTML) 5 Page - Unisonic Technologies |
5 / 7 page UC3844/45 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 5 of 7 www.unisonic.com.tw QW-R103-010.H ELECTRICAL CHARACTERISTICS(Cont.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT CURRENT SENSE SECTION Current Sense Input Voltage Gain (Note 2, 3) GV 2.85 3.0 3.15 V/V Maximum Current Sense Input Threshold (Note 2) VI(THR) 0.9 1.0 1.1 V Input Bias Current II(BIAS) -2.0 -10 μA Power Supply Rejection Ratio PSRR VCC=12V ~ 25V (Note 4) 70 dB Propagation Delay tPLH(IN/OUT) 150 300 ns OUTPUT SECTION Output Voltage Low VOL ISINK=20mA 0.1 0.4 V ISINK=200mA 1.6 2.2 High VOH ISINK=20mA 13 13.5 V ISINK=200mA 12 13.4 Output Voltage with UVLO Activated VOL(UVLO) VCC=6.0V, ISINK=1.0mA 0.1 1.1 V Output Voltage Rise Time tR CL=1.0nF,TJ=25°C 50 150 ns Output Voltage Fall Time tF CL=1.0nF,TJ=25°C 50 150 ns UNDERVOLTAGE LOCKOUT SECTION Startup Threshold UC3844 VTHR 14.5 16.0 17.5 V UC3845 7.8 8.4 9.0 Minimum Operating Voltage After Turn-On UC3844 VCC(MIN) 8.5 10.0 11.5 V UC3845 7.0 7.6 8.2 PWM SECTION Duty Cycle MAX DCMAX 47 48 50 % MIN DCMIN 0 % TOTAL DEVICE Power Supply Zener Voltage VZ ICC=25mA 30 36 V Power Supply Current (Note 4) UC3845 ICC VCC=6.5V 0.5 1.0 mA UC3844 VCC=14V 12 17 Startup Current ISTART-UP VCC=14V, UVLO Active 0.3 0.5 mA Notes: 1. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 2.This parameter is measured at the latch trip point with VFB=0V. 3.Comparator gain is defined as: V Output Compensation AV= V Current Sense Input 4. Adjust VCC above the startup threshold before setting to 15V. |
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