TDA4863 datasheet(7/27 Pages) INFINEON

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TDA4863

Overview

Data Sheet

V1.0, 2003-05

Pin Definitions and Functions

Symbol

Description

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.

VAOUT

Voltage Amplifier Output

VAOUT 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.

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. 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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