ZHCSFB9B June 2016 – March 2019 TPS63070
PRODUCTION DATA.
The PS/SYNC pin has two functions:
The power save mode is disabled when PS/SYNC is set low. The device then operates in forced fixed frequency PWM mode independent of the output current.
TPS6307x can be synchronized to an external clock applied at pin PS/SYNC. Details about the voltage level and frequency range can be found in the electrical characteristics. When an external clock is detected, TPS6307x switches from internal clock or power save mode to fixed frequency operation based on the external clock frequency. When the external clock is removed, TPS6307x switches back to internal clock or power save mode depending on the average inductor current and status of the PS/SYNC pin. The PS/SYNC pin has two parallel input stages, a slow one with the precise threshold for PWM/PFM mode change and a fast digital input stage for an external clock signal for synchronization.
It is recommended to not connect PS/SYNC directly to VIN but use a resistor in series in the range of 1kΩ to 1MΩ. If several inputs like EN and PS/SYNC are connected to VIN, the resistor can be shared. No resistor is required if the pin is driven from an analog or digital signal rather than a supply voltage.