ZHCSKK3B December 2019 – February 2022 TPS6594-Q1
PRODUCTION DATA
The TPS6594-Q1 device supports spread-spectrum modulation of the switching clock signal used by the BUCK regulators. Three factory-selectable modulation modes are available: the first mode is modulation from external input clock at the SYNCCLKIN pin; the second mode is modulating the input clock at the SYNCCLKIN pin using the DPLL; the third mode is modulating the internal 20-MHz RC-Oscillator clock using the DPLL.
The spread-spectrum modulation mode is pre-configured in NVM. Changing this modulation mode during operation is not supported.
The modulation frequency range is limited by the DPLL bandwidth. The max frequency spread for the input clock to the DPLL is ±18% to secure parametric compliance of the BUCK output performance.
The internal modulation is disabled by default and can be enabled and configured after power up. Internal modulation is activated by setting the SS_EN control bit. The internal modulation must be disabled (SS_EN = 0) when changing the following parameter:
When internal modulation is enabled and configured, it can be disabled by the system MCU during operation. The device transition to different mission states does not impact internal modulation when it is enabled and configured.