TDA4817 データシートの表示（PDF） - Infineon Technologies

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TDA4817

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

Infineon Technologies 

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. During no load

conditions output pulses are suppressed completely whenVAOUT 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.

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.

3

2005-02-17

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