The AAT11732 is a triple-channel TFT LCD power solution that provides a boost PWM controller, two high voltage LDO drivers (one for positive VOUT2 voltage and one for negative VOUT3 voltage), five operational amplifiers, and one high voltage, which switches up to 40V for TFT LCD display.
The PWM controller consists of an on-chip voltage reference, oscillator, error amplifier, current sense circuit, comparator, under-voltage lockout protection and internal soft-start circuit. The thermal and power fault protection prevents internal circuit being damaged by excessive power.
The high voltage LDO drivers generate two regulated output voltage (VOUT2 and VOUT3) set by external resistor dividers. VGH voltage does not activate until DLY voltage exceeds 1.25V.
The AAT11732 contains 4+1 operational amplifiers.
VO1, VO2, VO4, and VO5 are for VGAMMA corrections and VO3 is for VCOM. In the short circuit condition, all operational amplifiers are capable of sourcing ±200mA current.
With the minimal external components, the AAT11732 offers a simple and economical solution for TFT LCD power.