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UC2855BDWG4 데이터시트(PDF) 6 Page - Texas Instruments |
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UC2855BDWG4 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 12 page 6 UC2855A/B UC3855A/B ZVS: This pin senses when the drain voltage of the main MOSFET switch has reached approximately zero volts, and resets the ZVT latch via the ZVT comparator. A mini- mum and maximum ZVTOUT pulse width are program- mable from this pin. To directly sense the ≈400V drain voltage of the main switch, a blocking diode is connected between ZVS and the high voltage drain. When the drain reaches 0V, the level on ZVS is ≈0.7V which is below the 2.6V ZVT comparator threshold. The maximum ZVTOUT pulse width is approximately equal to the oscillator blank- ing period time. ZVTOUT: The output of the ZVT block is a 750mA peak totem pole MOSFET gate driver on ZVTOUT. Since the ZVT MOSFET switch is typically 3X smaller than the main switch, less peak current is required from this out- put. Like GTOUT, a series gate resistor and Schottky di- ode to GND are recommended. This pin may also be used as a high current synchronization output driver. PIN DESCRIPTIONS (cont.) log f -60 -40 -20 0 20 40 60 0 80 -45 Phase Degrees 100 -90 120 10kHz 1MHz 10MHz 100kHz Gain Phase 5.992 496 516 MHz Figure 1. Current Amplifier Frequency Response Frequency kHz Phase Margin degrees Open-Loop Gain dB -20 0 20 40 60 80 100 120 0.1 1 10 100 1000 10000 Figure 2. Voltage Amplifier Gain Phase vs Frequency 10 12 14 16 18 20 22 24 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE °C Figure 4. Supply Current ON 2.90 2.92 2.94 2.96 2.98 3.00 3.02 3.04 3.06 3.08 3.10 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE °C Figure 3. Voltage Amplifier Input Threshold For more information see Unitrode Applications Note U-153. |
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