TDA4863 Datasheet, PDF (7/27 Pages) Infineon Technologies AG – Boost Controller

TDA4863
Overview
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.
3 MULTIN 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.
5 DETIN Zero Current Detector Input
DETIN is connected to an auxiliary winding and monitors the zero
crossing of the inductor current.
6 GND Ground
7 GTDRV 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.
8 VCC
Positive Voltage Supply
If V_CC exceeds the turn-on threshold the IC is switched on. When V_CC
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.
Data Sheet
7
V1.0, 2003-05