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UC3825B Scheda tecnica(PDF) 4 Page - Texas Instruments |
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UC3825B Scheda tecnica(HTML) 4 Page - Texas Instruments |
4 / 9 page 4 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 Current Limit/Start Sequence/Fault Section (cont.) Over Current Threshold 1.14 1.2 1.26 V ILIM Delay to Output VILIM = 0 to 2V Step (Note 1) 50 80 ns Output Section Output Low Saturation IOUT = 20mA 0.25 0.4 V IOUT = 200mA 1.2 2.2 V Output High Saturation IOUT = 20mA 1.9 2.9 V IOUT = 200mA 2 3 V UVLO Output Low Saturation IO = 20mA 0.8 1.2 V Rise/Fall Time CL = 1nF (Note 1) 20 45 ns UnderVoltage Lockout Start Threshold UCX823B and X825B only 16 17 V Stop Threshold UCX823B and X825B only 9 10 V UVLO Hysteresis UCX823B and X825B only 5 6 7 V Start Threshold UCX823A and X825A only 8.4 9.2 9.6 V UVLO Hysteresis UCX823A and X825A only 0.4 0.8 1.2 V Supply Current Startup Current VC = VCC = VTH(start) –0.5V 100 300 µA Icc 28 36 mA Note 1:Guaranteed by design. Not 100% tested in production. OSCILLATOR The UC3823A,B/3825A,B oscillator is a saw tooth. The rising edge is governed by a current controlled by the RT pin and value of capacitance at the CT pin. The falling edge of the sawtooth sets dead time for the outputs. Se- lection of RT should be done first, based on desired maximum duty cycle. CT can then be chosen based on desired frequency, RT, and DMAX. The design equations are: () () RT V mA DMAX = 3 10 1 – () () CT D RT F MAX = • • 16 . Recommended values for RT range from 1k to 100k. Control of DMAX less than 70% is not recommended. Oscillator APPLICATIONS INFORMATION UDG-95102 |
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