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UC3851NG4 Datasheet(PDF) 3 Page - Texas Instruments |
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UC3851NG4 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 12 page ELECTRICAL CHARACTERISTICS: PARAMETER TEST CONDITIONS UC1851 / UC2851 UC3851 UNITS MIN TYP MAX MIN TYP MAX Ramp Generator Ramp Current, Minimum ISENSE = −10µA -11 -14 -11 -14 µA Ramp Current, Maximum ISENSE = 1.0mA -0.9 -.95 -0.9 -.95 mA Ramp Valley 0.3 0.4 0.6 0.3 0.4 0.6 V Ramp Peak Clamping Level 3.9 4.2 4.5 3.9 4.2 4.5 V Error Amplifier Input Offset Voltage VCM = 5.0V 0.5 5 2 10 mV Input Bias Current 0.5 2 1 5 µA Input Offset Current 0.5 0.5 µA Open Loop Gain ∆VO = 1 to 3V 60 66 60 66 dB Output Swing (Max Output ≤ Ramp Peak - 100mV) Minimum Total Range 0.3 3.5 0.3 3.5 V CMRR VCM = 1.5 to 5.5V 70 80 70 80 dB PSRR VIN = 8 to 30V 70 80 70 80 dB Short Circuit Current VCOMP = 0V -4 -10 -4 -10 mA Gain Bandwidth (Note 1) TJ = 25°C, AVOL = 0dB 1 2 1 2 MHz Slew Rate (Note 1) TJ = 25°C, AVCL = 0dB 0.8 0.8 V/ µs PWM Section Continuous Duty Cycle Range (other than zero) (Note 1) Minimum Total Continuous Range Ramp Peak < 4.2V 246 2 46 % Output High Level ISOURCE = 20mA 18 18.5 18 18.5 V ISOURCE = 200mA 17 18.5 17 18.5 V Rise Time (Note 1) TJ = 25°C, CL = 1nF 50 150 50 150 ns Fall Time (Note 1) TJ = 25°C, CL = 1nF 50 150 50 150 ns Output Saturation IOUT = 20mA 0.2 0.4 0.2 0.4 V IOUT = 200mA 1.7 2.2 1.7 2.2 V Comparator Delay (Note 1) Pin 8 to Pin 12, TJ = 25°C, RL = 1k Ω 300 500 300 500 ns Sequencing Functions Comparator Thresholds Pins 2, 3, 5 2.8 3.0 3.2 2.8 3.0 3.2 V Input Bias Current Pins 3, 5 = 0V -1.0 -4.0 -1.0 -4.0 µA Input Leakage Pins 3, 5 = 10V 0.1 2.0 0.1 2.0 µA Start/UV Hysteresis Current Pin 2 = 2.5V 170 200 220 170 200 230 µA Ext. Stop Threshold Pin 4 0.8 1.6 2.4 0.8 1.6 2.4 V Error Latch Activate Current Pin 4 = 0V, Pin 3 > 3V -120 -200 -120 -200 µA Driver Bias Saturation Voltage, VIN-VOH IB = -50mA 2 3 2 3 V Driver Bias Leakage VB = 0V -0.1 -10 -0.1 -10 µA Slow-Start Saturation IS = 10mA 0.2 0.5 0.2 0.5 V Slow-Start Leakage VS = 4.5V 0.1 2.0 0.1 2.0 µA Current Control Current Limit Offset 0 5 0 10 mV Current Shutdown Offset 370 400 430 360 400 440 mV Input Bias Current Pin 7 = 0V -2 -5 -2 -5 µA Common Mode Range (Note 1) -0.4 3.0 -0.4 3.0 V Current Limit Delay (Note 1) TJ = 25°C, Pin 7 to 12, RL = 1k 200 400 200 400 ns Note 1:Guaranteed by design. Not 100% tested in production. UC1851 UC2851 UC3851 Unless otherwise stated, these specifications apply for TA = -55°C to +125°C for the UC1851, -40°C to +85°C for the UC2851, and 0°C to 70°C for the UC3851; VIN = 20V, RT = 20k Ω, CT = .001 mfd, RR = 10kΩ, CR = .001mfd. Current Limit Threshold = 200mV, TA = TJ. 3 |
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