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TDA4863 Datasheet(PDF) 7 Page - Infineon Technologies AG

Part No. TDA4863
Description  Boost Controller
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Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
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 7 page
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TDA4863
Overview
Data Sheet
7
V1.0, 2003-05
Pin Definitions and Functions
Pin
Symbol
Description
1
VSENSE Voltage Amplifier Inverting Input
VSENSE is connected via a resistive divider to the boost converter
output. With a capacitor connected to VAOUT the internal error
amplifier acts as an integrator.
2
VAOUT
Voltage Amplifier Output
V
VAOUT is connected internally to the first multiplier input. To prevent
overshoot the input voltage is clamped internally at 5 V. If V
VAOUT is
less than 2.2 V the gate driver is inhibited. If the current flowing into
this pin exceeds an internal threshold the multiplier output voltage is
reduced to prevent the MOSFET from overvoltage damage.
3MULTIN
Multiplier Input
MULTIN is the second multiplier input and is connected via a resistive
divider to the rectifier output voltage.
4
ISENSE
Current Sense Input
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. A leading edge blanking circuitry
suppresses voltage spikes when turning the MOSFET on.
5DETIN
Zero Current Detector Input
DETIN is connected to an auxiliary winding and monitors the zero
crossing of the inductor current.
6GND
Ground
7GTDRV
Gate Driver Output
GTDRV is the output of a totem-pole circuitry for direct driving a
MOSFET. An active shutdown circuitry ensures that GTDRV is set to
low if the IC is switched off.
8VCC
Positive Voltage Supply
If V
CC exceeds the turn-on threshold the IC is switched on. When VCC
falls below the turn-off threshold the IC is switched off. In switch off
mode power consumption is very low. Two capacitors should be
connected to VCC. An electrolytic capacitor and 100 nF ceramic
capacitor which is used to absorb fast supply current spikes. Make
sure that the electrolytic capacitor is discharged before the IC is
plugged into the application board.




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