ZHCSD04E November 2014 – March 2022 TPS65400
PRODUCTION DATA
The TON_TRANSITION_RATE command sets the soft-start ramp rate for the selected output. This command is ignored by default because soft-start is set externally through the SSx/ PG pin. Only when the SSx/ PG pin is configured as PG through PIN_CONFIG_01 will TON_TRANSITION_RATE determine the soft-start rate.
The soft-start ramp rate refers to the rate at which the reference voltage is increased. The time to complete the soft-start can be calculated from the target reference voltage as Equation 6.
For example, if VREF is set to 0.6 V and the default soft-start ramp rate of 0.5 V/ms is selected, then the soft-start time would be 1.2 ms. If VREF is set to 1 V and the soft-start ramp rate of 0.25 V/ms is selected, then the soft-start time would be 4 ms.
BITS | NAME | READ / WRITE | DEFAULT VALUE | BINARY VALUE | VALUE | MEANING |
---|---|---|---|---|---|---|
7:2 | — | R | 000000 | — | — | — |
1:0 | TON_RAMP_RATE | R/W | 10 | 00 | 2 V/ms | Soft-start ramping rate |
01 | 1 V/ms | |||||
10 | 0.5 V/ms | |||||
11 | 0.25 V/ms |
PAGE support is for outputs 0x00 through 0x03.