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UC3844G-S08-R Datasheet(PDF) 5 Page - Unisonic Technologies |
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UC3844G-S08-R Datasheet(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.D ELECTRICAL CHARACTERISTICS(Cont.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT CURRENT SENSE SECTION Current Sense Input Voltage Gain GV (Note 2, 3) 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 (Note4) 70 dB Propagation Delay tPLH(IN/OUT) 150 300 ns OUTPUT SECTION ISINK=20mA 0.1 0.4 Low VOL ISINK=200mA 1.6 2.2 V ISINK=20mA 13 13.5 Output Voltage High VOH ISINK=200mA 12 13.4 V 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 UC3844 14.5 16.0 17.5 Startup Threshold UC3845 VTHR 7.8 8.4 9.0 V UC3844 8.5 10.0 11.5 Minimum Operating Voltage After Turn-On UC3845 VCC(MIN) 7.0 7.6 8.2 V PWM SECTION Max DCMAX 47 48 50 % Duty Cycle Min DCMIN 0 % TOTAL DEVICE Power Supply Zener Voltage VZ ICC=25mA 30 36 - V UC3845 VCC=6.5V 0.5 1.0 Power Supply Current (Note 4) UC3844 ICC VCC=14V 12 17 mA Note: 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: ΔV Output Compensation AV= ΔV Current Sense Input 4. Adjust VCC above the startup threshold before setting to 15V. |
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