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UC2854DW 데이터시트(PDF) 5 Page - Texas Instruments |
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UC2854DW 데이터시트(HTML) 5 Page - Texas Instruments |
5 / 13 page GT Drv (Pin 16) (gate drive): The output of the PWM is a totem pole MOSFET gate driver on GT Drv. This output is internally clamped to 15V so that the IC can be operated with VCC as high as 35V. Use a series gate resistor of at least 5 ohms to prevent interaction between the gate im- pedance and the GT Drv output driver that might cause the GT Drv output to overshoot excessively. Some over- shoot of the GT Drv output is always expected when driv- ing a capacitive load. TYPICAL CHARACTERISTICS at TA = TJ = 25 °C UC1854 UC2854 UC3854 Load Capacitance, µF ns 0 100 200 300 400 500 600 700 0 0.01 0.02 0.03 0.04 0.05 Rise Time Fall Time RSET, k Ω Duty Cycle 70% 75% 80% 85% 90% 95% 100% 1 10 100 I, A AC µ Multiplier Output µA 0 100 200 300 400 500 600 0 100 200 300 400 500 600 700 800 Mult Out=1 Mult Out=2V Mult Out=3V Mult Out=0V V =2V, VA Out=5V RMS R, k SET Ω Frequency kHz 10 100 1000 1 10 100 100pF 200pF 5nF 10nF 3nF 500pF 2nF 1nF Frequency kHz Phase Margin degrees Open-Loop Gain dB -20 0 20 40 60 80 100 120 0.1 1 10 100 1000 10000 Frequency kHz Phase Margin degrees Open-Loop Gain dB -20 0 20 40 60 80 100 120 0.1 1 10 100 1000 10000 PIN DESCRIPTIONS (cont.) Voltage Amplifier Gain and Phase vs Frequency Current Amplifier Gain and Phase vs Frequency Gate Drive Rise and Fall Time Gate Drive Maximum Duty Cycle Multiplier Output vs Voltage on Mult Oscillator Frequency vs RSET and CT 5 |
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