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UC3844L-D08-T Datasheet(PDF) 4 Page - E-Tech Electronics LTD |
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UC3844L-D08-T Datasheet(HTML) 4 Page - E-Tech Electronics LTD |
4 / 6 page UC3844/45 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 4 of 6 www.unisonic.com.tw QW-R103-010.E 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 (Note4) 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 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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