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UC1525B-SP Scheda tecnica(PDF) 5 Page - Texas Instruments |
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UC1525B-SP Scheda tecnica(HTML) 5 Page - Texas Instruments |
5 / 13 page UC1525B-SP www.ti.com............................................................................................................................................................................................... SLUS874 – JANUARY 2009 ELECTRICAL CHARACTERISTICS (continued) VIN = 20 V, TA = TJ = –55°C to 125°C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Error Amplifier Section (VCM = 5.1 V) Input offset voltage 0.5 5 mV Input bias current 1 10 µA Input offset current 1 µA DC open loop gain RL ≥ 10 MΩ 60 75 dB Gain-bandwidth product (3) AV = 0 dB, TJ = 25°C 1 2 MHz Ouput low level 0.2 0.5 V Output high level 3.8 5.6 V Common mode rejection VCM = 1.5 V to 5.2 V 60 75 dB Supply voltage rejection VIN = 8 V to 35 V 50 60 dB PWM Comparator Minimum duty cycle 0 % Maximum duty cycle(4) 45 49 % Input threshold(4) Zero duty cycle 0.7 0.9 V Input threshold(4) Maximum duty cycle 3.3 3.6 V Input bias current 0.05 µA Shutdown Section Soft start current VSHUTDOWN = 0 V, VSOFTSTART = 0 V 25 50 80 µA Soft start low level VSHUTDOWN = 2.5 V 0.4 0.7 V Shutdown threshold To outputs, VSOFTSTART = 5.1 V, TJ = 25°C 0.6 0.8 1 V Shutdown input current VSHUTDOWN = 2.5 V 0.4 1 mA Shutdown delay(3) VSHUTDOWN = 2.5 V, TJ = 25°C 0.2 0.5 µs Output Drivers (Each OUtput) (VC = 20 V) ISINK = 20 mA 0.2 0.4 Output low level V ISINK = 100 mA 1 2 ISOURCE = 20 mA 18 19 Output high level V ISOURCE = 100 mA 17 18 Undervoltage lockout VCOMP and VSOFTSTART = High 6 7 8 V Collector leakage VC = 35 V 200 µA Rise time(3) CL = 1 nF, TJ = 25°C 100 600 ns Fall time(3) CL = 1 nF, TJ = 25°C 50 300 ns Cross conduction charge Per cycle, TJ = 25°C 30 nc Total Standby Current Supply current VIN = 35 V 14 20 mA (3) Parameters ensured by design and/or characterization, if not production tested. (4) Tested at fosc = 40 kHz (RT = 3.6 kΩ, CT = 0.01 µF, RD = 0 Ω). Approximate oscillator frequency is defined by: f = 1/(CT (0.7 x RT + 3RD)). Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): UC1525B-SP |
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