JAJSHS0C March 2019 – March 2021 TPS92682-Q1
PRODUCTION DATA
The PDRVx output is a function of the internal PWM signal and is capable of sinking and sourcing up to 50 mA of peak current to control a high-side series connected P-channel dimming FET. The PDRV switches between VCSP and (VCSP – 7 V) is based on the status of the PWM signal to completely turn off and turn on the external P-channel dimming FET. In CC mode, a series dimming FET is required to achieve high contrast ratio since it ensures fast rise and fall times of the LED current in response to the PWM input. Without any dimming FET, the rise and fall times are limited by the inductor slew rate and the closed-loop bandwidth of the system. In CC mode, leave the PDRVx pin unconnected if not used. In CV mode, the PDRVx together with CSPx and CSNx pins can be connected to GND to limit the shutdown current. The PDRVx can also be disabled by setting the CHxPDRVEN bit in Table 7-3 to zero.