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UC3825A Folha de dados(PDF) 3 Page - Texas Instruments |
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UC3825A Folha de dados(HTML) 3 Page - Texas Instruments |
3 / 9 page 3 UC1823A,B/1825A,B UC2823A,B/2825A,B UC3823A,B/3825A,B ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the UC1823A,B and UC1825A,B; –40°C to +85°C for the UC2823A,B and UC2825A,B; 0°C to +70°C for the UC3823A,B and UC3825A,B; RT = 3.65k, CT = 1nF, VCC = 12V, TA =TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Oscillator Section Initial Accuracy TJ = 25°C (Note 1) 375 400 425 kHz Total Variation Line, Temperature (Note 1) 350 450 kHz Voltage Stability 12V < VCC < 20V 1 % Temperature Stability TMIN < TA <TMAX (Note 1) 5 % Initial Accuracy RT = 6.6k, CT = 220pF, TA = 25°C (Note 1) 0.9 1 1.1 MHz Total Variation RT = 6.6k, CT = 220pF (Note 1) 0.85 1.15 MHz Clock Out High 3.7 4 V Clock Out Low 0 0.2 V Ramp Peak 2.6 2.8 3 V Ramp Valley 0.7 1 1.25 V Ramp Valley to Peak 1.6 1.8 2 V Oscillator Discharge Current RT = Open, VCT = 2V 9 10 11 mA Error Amplifier Section Input Offset Voltage 210 mV Input Bias Current 0.6 3 µA Input Offset Current 0.1 1 µA Open Loop Gain 1V < VO < 4V 60 95 dB CMRR 1.5V < VCM < 5.5V 75 95 dB PSRR 12V < VCC < 20V 85 110 dB Output Sink Current VEAOUT = 1V 1 2.5 mA Output Source Current VEAOUT = 4V –0.5 –1.3 mA Output High Voltage IEAOUT = –0.5mA 4.5 4.7 5 V Output Low Voltage IEAOUT = 1mA 0 0.5 1 V Gain Bandwidth Product F = 200kHz 6 12 MHz Slew Rate (Note 1) 6 9 V/ µs PWM Comparator RAMP Bias Current VRAMP = 0V –1 –8 µA Minimum Duty Cycle 0% Maximum Duty Cycle 85 % Leading Edge Blanking R = 2k, C = 470pF 300 375 450 ns LEB Resistor VCLK/LEB = 3V 8.5 10 11.5 kohm EAOUT Zero D.C. Threshold VRAMP = 0V 1.1 1.25 1.4 V Delay to Output VEAOUT = 2.1V, VRAMP = 0 to 2V Step (Note 1) 50 80 ns Current Limit/Start Sequence/Fault Section Soft Start Charge Current VSS = 2.5V 8 14 20 µA Full Soft Start Threshold 4.3 5 V Restart Discharge Current VSS = 2.5V 100 250 350 µA Restart Threshold 0.3 0.5 V ILIM Bias Current 0 < VILIM < 2V 15 µA Current Limit Threshold 0.95 1 1.05 V |
Nº de peça semelhante - UC3825A |
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Descrição semelhante - UC3825A |
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