TDA4862 データシートの表示（PDF） - Siemens AG

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TDA4862

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

Siemens AG 

TDA 4862

Pin Definitions and Functions

Pin Symbol Function

1 VSENSE Voltage Amplifier Inverting Input;

VSENSE is connected via a resistive divider to the boost converter output.

With a capacitor connected to VAOUT it forms an integrator.

2

VAOUT

Voltage Amplifier Output;

VAOUT 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

ISENSE

Current Sense Minus;

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. 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. VCC 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 VCC

Positive Supply Voltage;

VCC 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 VCC absorbs supply current spikes required to

charge external MOSFET gate capacitances.

Semiconductor Group

3

1998-02-16

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