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TDA4862G 데이터시트(PDF) 3 Page - Siemens Semiconductor Group |
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TDA4862G 데이터시트(HTML) 3 Page - Siemens Semiconductor Group |
3 / 17 page TDA 4862 Semiconductor Group 3 1998-02-16 Pin Definitions and Functions Pin Symbol Function 1 V SENSE Voltage Amplifier Inverting Input; V SENSE is connected via a resistive divider to the boost converter output. With a capacitor connected to V AOUT it forms an integrator. 2 V AOUT Voltage Amplifier Output; V AOUT is connected internally to the first multiplier input. To prevent overshoot the input voltage will be clamped at 5 V. Input voltage less than 2.2 V is inhibiting the gate driver. If the current flowing into this pin is exceeding an internal defined margin the multiplier output voltage is reduced to prevent the MOSFET from overvoltage damage. 3 MULTIN Multiplier Input; MULTIN is the second multiplier input and connected via a resistive divider to the rectifier output voltage. 4 I SENSE Current Sense Minus; I SENSE is connected to a sense resistor controlling the MOSFET source current. The input is internally clamped at – 0.3 V to prevent negative input voltage interaction. An internal low pass filter suppresses voltage spikes when turning the MOSFET on. 5 DETIN Zero Current Detector Input; DETIN is connected to an auxiliary winding monitoring the zero crossing of the inductor current. 6 GND Ground; All voltages are measured with respect to GND. V CC should be bypassed directly to GND with a 0.1 µF or larger ceramic capacitor. 7 GTDRV Gate Drive Output; GTDRV is the output of a totem-pole circuitry for direct driving a MOSFET. A clamping network bypasses low state source current and high state sink current. 8 V CC Positive Supply Voltage; V CC should be connected to a stable source slightly above the VCC turn-ON threshold for normal operation. A 100 nF or lager ceramic capacitor connected to V CC absorbs supply current spikes required to charge external MOSFET gate capacitances. |
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