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MIC3838 Datasheet(PDF) 3 Page - Micrel Semiconductor |
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MIC3838 Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 11 page August 2003 3 MIC3838/3839 MIC3838/3839 Micrel Pin Description Pin Number Pin Name Pin Function 7, 8 OUTB, OUTA Alternating high current output stages. Both stages are capable of driving the gate of a power MOSFET. Each stage is capable of 500mA peak source current, and 1A peak sink current. The output stages switch at half the oscillator frequency, in a push/pull configuration. When the voltage on the RC pin is rising, one of the two outputs is high, but during fall time, both outputs are off. This “dead time” between the two outputs, along with a slower output rise time than fall time, insures that the two outputs can not be on at the same time. This dead time is typically 60ns to 200ns and depends upon the values of the timing capacitor and resistor. The high-current output drivers consist of MOSFET output devices, which switch from V DD to GND. Each output stage also provides a very low impedance to overshoot and undershoot. This means that in many cases, external Schottky clamp diodes are not required. 9 VDD The power input connection for this device. Total V DD current is the sum of quiescent V DD current and the average gate drive (OUT) current. Knowing the operating frequency and the MOSFET gate charge (Qg), average OUT current can be calculated from IOUT = Qg • F, where Qg is the total gate change of all MOSFETs (OUTA and OUTB) and F is oscillator switching frequency. To prevent noise problems, bypass VDD to GND with a ceramic capacitor as close to the chip as possible. A 1 µF decoupling capacitor is recommended. 10 VREF Internal 3V supply. Will source 1mA maximum. |
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