TDA4863-2_05 datasheet(7/27 Pages) INFINEON

部品番号	TDA4863-2

部品情報	Power-Factor Controller (PFC) IC for High Power Factor and Low THD

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Pin Definitions and Functions

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. IfV

VAOUT is

less then 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.

3

MULTIN

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 spits 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

7

GTDRV

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 0.85V. An active shutdown circuitry ensures that GTDRV

is set to low if the IC is switched off.

8

VCC

Positive Voltage Supply

If V

CC excees 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 100nF cermanic

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.

TDA4863-2

Overview

Version 2.1

7

22 Feb 2005

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