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UC2842AQ Datasheet(PDF) 6 Page - Texas Instruments |
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UC2842AQ Datasheet(HTML) 6 Page - Texas Instruments |
6 / 15 page UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ CURRENT-MODE PWM CONTROLLER SGLS164 – APRIL 2003 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics, TA = –40_C to 125_C, VCC = 15 V (see Note 1), RT = 10 kΩ, CT = 3.3 nF, and TA = TJ (unless otherwise stated) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS PWM Section Maximum duty cycle UC2842A, UC2843A 94 96 100 % Maximum duty cycle UC2844A, UC2845A 47 48 50 % Minimum duty cycle 0 % Total Standby Current Start-up current 0.3 0.5 mA Operating supply current FB = 0 V, SENSE = 0 V 11 17 mA VCC internal zener voltage ICC = 25 mA 30 34 V NOTES: 1. Adjust VCC above the start threshold before setting at 15 V. 2. Not production tested. 3. Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation: Temp Stability = VREF (max) – VREF (min) TJ (max) – TJ (min) . VREF (max) and VREF (min) are the maximum and minimum reference voltage measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in temperature. 4. Output frequency equals oscillator frequency for the UC2842A and UC2843A. Output frequency is one half oscillator frequency for the UC2844A and UC2845A. 5. This parameter is measured with RT = 10 kΩ to VREF. This contributes approximately 300 µA of current to the measurement. The total current flowing into the RT/C pin will be approximately 300 µA higher than the measured value. 6. Parameter measured at trip point of latch with VFB at 0 V. 7. Gain is defined by: A = DVCOMP DVSENSE ; 0 v VSENSE v 0.8 V. PA RAMETER MEASUREMENT INFORMATION Error Amp can source and sink up to 0.5 mA, and sink up to 2 mA. Figure 1. Error Amp Configuration |
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