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Q67040-S4621 Datasheet(PDF) 7 Page - Infineon Technologies AG |
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Q67040-S4621 Datasheet(HTML) 7 Page - Infineon Technologies AG |
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7 / 27 page  TDA4863-2 Overview Data Sheet 7 V1.2, 2004-02 Pin Definitions and Functions Pin Symbol Description 1 VSENSE Voltage Amplifier Inverting Input VSENSE is connected via a resistive divider to the boost converter output. With a capacitor connected to VAOUT the internal error amplifier acts as an integrator. 2 VAOUT Voltage Amplifier Output VVAOUT is connected internally to the first multiplier input. To prevent overshoot the input voltage is clamped internally at 5 V. If V VAOUT is less than 2.2 V the gate driver is inhibited. If the current flowing into this pin exceeds an internal threshold the multiplier output voltage is reduced to prevent the MOSFET from overvoltage damage. 3MULTIN Multiplier Input MULTIN is the second multiplier input and is connected via a resistive divider to the rectifier output voltage. 4 ISENSE Current Sense Input ISENSE 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. A leading edge blanking circuitry suppresses voltage spikes when turning the MOSFET on. 5DETIN Zero Current Detector Input DETIN is connected to an auxiliary winding and monitors the zero crossing of the inductor current. 6GND Ground 7GTDRV Gate Driver Output GTDRV is the output of a totem-pole circuitry for direct driving a MOSFET. Compared with TDA4863 the TDA4863-2 can drive 20A MOSFETS. To achieve this the gate output voltage V GTLat IGT=0A has been set to 0.85 V. An active shutdown circuitry ensures that GTDRV is set to low if the IC is switched off. 8VCC Positive Voltage Supply If V CC exceeds the turn-on threshold the IC is switched on. When VCC falls below the turn-off threshold the IC is switched off. In switch off mode power consumption is very low. Two capacitors should be connected to VCC. An electrolytic capacitor and 100 nF ceramic capacitor which is used to absorb fast supply current spikes. Make sure that the electrolytic capacitor is discharged before the IC is plugged into the application board. |
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