ZHCSLC6B May 2020 – January 2022 TPS92200
PRODUCTION DATA
The device is protected from several kinds of fault conditions, such as LED open and short, sense resistor open and short, and thermal shutdown.
| TYPE | CRITERION | BEHAVIOR |
|---|---|---|
| LED open load | VFB close to 0 mV | The device keeps maximum duty cycle turn-on. |
| LED+ and LED– short circuit | VFB > VFB_OVP | When VFB > VFB_OVP, the device keeps the minimum on-time, and starts the auto-retry timer. During the auto-retry mode, the device is protected by the overcurrent limits. |
| LED+ short-to-GND | High-side or low-side NMOS current limit triggered | When the high-side or low-side MOSFET current limit is triggered, the device starts the auto-retry timer. |
| Sense-resistor open load | VFB > VFB_OVP | When VFB > VFB_OVP, the device keeps the minimum on-time, and starts the auto-retry timer. |
| Sense-resistor short circuit to GND | High-side or low-side MOSFET current limit triggered | When the high-side or low-side MOSFET current limit is triggered, the device starts the auto-retry timer. |
| Thermal shutdown | TJ > TTSD | Disable the device when TJ>TTSD, re-activate the device when TJ falls below the hysteresis level. |