TDA4862 Datasheet, PDF (3/17 Pages) Siemens Semiconductor Group – Power-Factor Controller PFC IC for High Power Factor and Active Harmonic Filter

TDA 4862
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. 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
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.
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. V_CC 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 V_CC
Positive Supply Voltage;
V_CC should be connected to a stable source slightly above the V_CC
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.
Semiconductor Group
3
1998-02-16