Datasheet

RT/CLK

TPS54061

Clock

Source

PLL

RT/CLK

TPS54061

Hi-Z

Clock

Source

PLL

TPS54061

SLVSBB7C –MAY 2012–REVISED JANUARY 2014

www.ti.com

Figure 19. Synchronizing to a System Clock

Overvoltage Protection

The TPS54061 incorporates an output over-voltage transient protection (OVP) circuit to minimize voltage

overshoot when recovering from output fault conditions or strong unload 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 VSENSE pin voltage is lower than the

internal reference voltage for a considerable time, the output of the error amplifier will respond by clamping the

error amplifier output to a high voltage. Thus, requesting the maximum output current. Once the condition is

removed, the regulator output rises and the error amplifier output transitions to the steady state duty cycle. In

some applications, the power supply output voltage can respond faster than the error amplifier output can

respond, this actuality leads to the possibility of an output overshoot.

The OVP feature minimizes the output overshoot when using a low value output capacitor by comparing the

VSENSE pin voltage to OVP threshold which is 109% of the internal voltage reference. If the VSENSE pin

voltage is greater than the OVP threshold, the high side MOSFET is disabled to minimize output overshoot.

When the VSENSE voltage drops lower than the OVP threshold, the high side MOSFET resumes normal

operation.

Thermal Shutdown

The device implements an internal thermal shutdown until the junction temperature exceeds 176°C. The thermal

shutdown forces the device to stop switching until the junction temperature falls below the thermal trip threshold.

Once the die temperature decreases below 176°C, the device reinitiates the power up sequence by restarting the

internal slow start.

Product Folder Links: TPS54061