JAJSIO4A February 2020 – September 2020 TPS546A24A
PRODUCTION DATA
| CMD Address | 56h |
| Write Transaction: | Write Byte |
| Read Transaction: | Read Byte |
| Format: | Unsigned Binary (1 byte) |
| Phased: | No |
| NVM Back-up: | EEPROM |
| Updates: | On-the-fly |
The VIN_OV_FAULT_RESPONSE command instructs the device on what action to take in response to a PVIN Overvoltage Fault. Upon triggering the PVIN overvoltage fault, the converter responds per the data byte below, and the following actions are taken:
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RW | RW | RW | RW | RW | RW | RW | RW |
| VINOVF_RESP | VINOVF_RETRY | VIN_OVF_DLY | |||||
| LEGEND: R/W = Read/Write; R = Read only |
Bit | Field | Access | Reset | Description |
|---|---|---|---|---|
7:6 | VIN_OVF_ RESP | RW | NVM | PVIN Overvoltage fault response 00b: Ignore. Continue operating without interruption. 01b: Delayed Shutdown Continue Operating for a number of switching cycles defined by VIN_OVF_DLY, then if fault persists, shut down and restart according to VIN_OV_RETRY. 10b: Immediate Shutdown. Shut down and restart according to VIN_OV_RETRY. 11b: Invalid / Not Supported |
5:3 | VIN_OVF_ RETRY | RW | NVM | PVIN Overvoltage retry 0d: Do not attempt to restart (latch off). 1d-6d: After shutting down, wait one HICCUP period, and attempt to restart up to 1 - 6 times. After 1 - 6 failed restart attempts, do not attempt to restart (latch off). Restart attempts that occur while PVIN voltage is above VIN_OV_FAULT_LIMIT will not be observable but will be counted 7d: After shutting down, wait one HICCUP period, and attempt to restart indefinitely, until commanded OFF, or a successful start-up occurs. |
2:0 | VIN_OVF_ DLY | RW | NVM | PVIN Overvoltage delay time for respond after delay and HICCUP 0d: Shutdown delay of three PWM_CLK, HICCUP equal to TON_RISE 1d: Shutdown delay of three PWM_CLK, HICCUP equal to TON_RISE 2d - 4d: Shutdown delay of five PWM_CLK, HICCUP equal to 2 - 4 times TON_RISE 5d - 7d: Shutdown delay of nine PWM_CLK, HICCUP equal to 5 - 7 times TON_RISE |
If Section 7.6.46 is configured to ignore a VIN_OV_FAULT, and a VIN_OV_FAULT is present at the time of enabling the device, the device will not start up. To ensure the part will ignore any potential VIN_OV_FAULT at start-up, it is recommended to set the Section 7.6.45 greater than the maximum possible input voltage applied during start-up.
Attempts to write Section 7.6.46 to any value outside those specified as valid will be considered invalid/unsupported data and cause the TPS546A24A to respond by flagging the appropriate status bits and notifying the host according to the PMBus 1.3.1 Part II specification section 10.9.3.