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MIC4416 Datasheet(PDF) 7 Page - Micrel Semiconductor |
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MIC4416 Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 10 page May 2005 7 MIC4416/4417 MIC4416/4417 Micrel, Inc. Functional Description Refer to the functional diagram. The MIC4416 is a noninverting driver. A logic high on the CTL (control) input produces gate drive output. The MIC4417 is an inverting driver. A logic low on the CTL (control) input produces gate drive output. The G (gate) output is used to turn on an external N-channel MOSFET. Supply VS (supply) is rated for +4.5V to +18V. External capacitors are recommended to decouple noise. Control CTL (control) is a TTL-compatible input. CTL must be forced high or low by an external signal. A floating input will cause unpredictable operation. A high input turns on Q1, which sinks the output of the 0.3mA and the 0.6mA current source, forcing the input of the first inverter low. Hysteresis The control threshold voltage, when CTL is rising, is slightly higher than the control threshold voltage when CTL is falling. When CTL is low, Q2 is on, which applies the additional 0.6mA current source to Q1. Forcing CTL high turns on Q1 which must sink 0.9mA from the two current sources. The higher current through Q1 causes a larger drain-to-source voltage drop across Q1. A slightly higher control voltage is required to pull the input of the first inverter down to its threshold. Functional Diagram Logic-Level Input VS CTL G MIC4417 INVERTING MIC4416 NONINVERTING 0.3mA 0.6mA R1 2k GND VSWITCHED VSUPPLY D1 D4 D2 D5 D3 35V Q1 Q2 Q3 Q4 Functional Diagram with External Components Q2 turns off after the first inverter output goes high. This reduces the current through Q1 to 0.3mA. The lower current reduces the drain-to-source voltage drop across Q1. A slightly lower control voltage will pull the input of the first inverter up to its threshold. Drivers The second (optional) inverter permits the driver to be manu- factured in inverting and noninverting versions. The last inverter functions as a driver for the output MOSFETs Q3 and Q4. Gate Output G (gate) is designed to drive a capacitive load. V G (gate output voltage) is either approximately the supply voltage or approximately ground, depending on the logic state applied to CTL. If CTL is high, and VS (supply) drops to zero, the gate output will be floating (unpredictable). ESD Protection D1 protects VS from negative ESD voltages. D2 and D3 clamp positive and negative ESD voltages applied to CTL. R1 isolates the gate of Q1 from sudden changes on the CTL input. D4 and D5 prevent Q1’s gate voltage from exceeding the supply voltage or going below ground. |
Similar Part No. - MIC4416_05 |
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Similar Description - MIC4416_05 |
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