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TDA4862 Datasheet(PDF) 3 Page - Siemens Semiconductor Group

Part No. TDA4862
Description  Power-Factor Controller PFC IC for High Power Factor and Active Harmonic Filter
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Maker  SIEMENS [Siemens Semiconductor Group]
Homepage  http://www.siemens.com/
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 3 page
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TDA 4862
Semiconductor Group
3
1998-02-16
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 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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