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5962-8670408VXA Datasheet(PDF) 4 Page - Texas Instruments |
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5962-8670408VXA Datasheet(HTML) 4 Page - Texas Instruments |
4 / 11 page 4 UC1842A/3A/4A/5A UC2842A/3A/4A/5A UC3842A/3A/4A/5A PARAMETER TEST CONDITIONS UC184xA\UC284xA UC384xA UNITS MIN. TYP. MAX. MIN. TYP. MAX. Under-Voltage Lockout Section Start Threshold x842A/4A 15 16 17 14.5 16 17.5 V x843A/5A 7.8 8.4 9.0 7.8 8.4 9.0 V Min. Operation Voltage After x842A/4A 9 10 11 8.5 10 11.5 V Turn On x843A/5A 7.0 7.6 8.2 7.0 7.6 8.2 V PWM Section Maximum Duty Cycle x842A/3A 94 96 100 94 96 100 % x844A/5A 47 48 50 47 48 50 % Minimum Duty Cycle 0 0 % Total Standby Current Start-Up Current 0.3 0.5 0.3 0.5 mA Operating Supply Current VPIN 2 =VPIN 3 = 0V 11 17 11 17 mA VCC Zener Voltage ICC = 25mA 30 34 30 34 V Note 2: Ensured by design, but not 100% production tested. Note 3: Parameter measured at trip point of latch with VPIN2 = 0. Note 4: Gain defined as: A VPIN VPIN = ∆ ∆ 1 3 ;0 VPIN 3 0.8V. Note 5: Adjust VCC above the start threshold before setting at 15V. Note 6: Output frequency equals oscillator frequency for the UC1842A and UC1843A. Output frequency is one half oscillator fre- quency for the UC1844A and UC1845A. Note 7: “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 & minimum reference volt- age measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in temperature.” Note 8: This parameter is measured with RT = 10k to VREF.This contributes approximately 300 A of current to the measurement. The total current flowing into the RT/C pin will be approximately 300 A higher than the measured value. ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –55 °C ≤ TA ≤ 125°C for the UC184xA; –40 °C ≤ TA ≤ 125°C for the UC284xAQ; –40°C ≤ TA ≤ 85°C for the UC284xA; 0 ≤ TA ≤ 70°C for the UC384xA; VCC = 15V (Note 5); RT = 10k; CT = 3.3nF; TA =TJ; Pin numbers refer to DIL-8. Error Amp Configuration Error Amp can Source and Sink up to 0.5mA, and Sink up to 2mA. |
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