ZHCSG01C February 2017 – August 2018 DRV8320 , DRV8320R , DRV8323 , DRV8323R
PRODUCTION DATA.
The LMR16006 device incorporates an overvoltage transient protection (OVTP) circuit to minimize voltage overshoot when recovering from output fault conditions or strong unloaded transients on power supply designs with low-value output capacitance. For example, when the power supply output is overloaded, the error amplifier compares the actual output voltage to the internal reference voltage. If the voltage of the FB pin is lower than the internal reference voltage for a considerable time, the output of the error amplifier responds by clamping the error amplifier output to a high voltage, therefore requesting the maximum output current. When the condition clears, the regulator output rises and the error amplifier output transitions to the steady-state duty cycle. In some applications, the output voltage of the power supply can respond faster than the error amplifier output can respond which can result in output overshoot. The OVTP feature minimizes the output overshoot when using a low-value output capacitor by implementing a circuit to compare the FB pin voltage to the OVTP threshold which is 108% of the internal voltage reference. If the FB pin voltage is greater than the OVTP threshold, the high-side MOSFET is disabled preventing current from flowing to the output and minimizing output overshoot. When the FB voltage drops lower than the OVTP threshold, the high-side MOSFET can turn on at the next clock cycle.