Vout1

Vout2

SS/TR

FB

R1

R2

R3

R4

TPSM8281x

Figure 9-29. Schematic for Output Voltage Tracking

Figure 9-30. Output Voltage Tracking

9.3.2 Synchronizing to an External Clock

The TPSM8281x can be synchronized by applying a clock on the MODE/SYNC pin. There is no need for

any additional circuitry. See Figure 10-23. The clock can be applied, changed, and removed during operation.

The value of the RCF resistor is recommended to be chosen such that the internally defined frequency and

the externally-applied frequency are close to each other to have a fast settling time to the external clock.

Synchronizing to a clock is not possible, if the COMP/FSET pin is connected to Vin or GND. Figure 10-24 and

Figure 10-25 show the external clock being applied and removed. When an external clock is applied, the device

operates in PWM mode.

Figure 9-31. Frequency Synchronization

TPSM82810, TPSM82813

SLUSDN6B – SEPTEMBER 2019 – REVISED JULY 2024

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