TDA4862G datasheet(3/18 Pages) INFINEON

No de pièce	TDA4862G

Description	Power-Factor Controller (PFC) IC for High Power Factor and Active Harmonic Filter

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TDA 4862

3

200

5-02-17

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. During no load

conditions output pulses are suppressed completely when

V

AOUT falls

below 2.2 V.

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.

3MULTIN 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.

5DETIN

Zero Current Detector Input;

DETIN is connected to an auxiliary winding monitoring the zero crossing

of the inductor current.

6GND

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.

7GTDRV

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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