SLVSH95 July 2024 TPS546C25
ADVANCE INFORMATION
| CMD Address | 41h |
| Write Transaction: | Write Byte |
| Read Transaction: | Read Byte |
| Format: | Unsigned Binary (1 byte) |
| NVM Backup: | EEPROM |
| Updates: | On-the-fly |
The VOUT_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an output over-voltage fault. This includes both the fault limit programmed into VOUT_OV_FAULT_LIMIT and the SEL_FIX_OVF selected in SYS_CFG_USER1. The device also:
Return to Supported PMBus Commands.
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RW | R | RW | RW | RW | R | R | R |
| IGNRZ_OV | 0 | RS_OV | TD_OV | ||||
| LEGEND: R/W = Read/Write; R = Read only |
| Bit | Field | Access | Reset | Description |
|---|---|---|---|---|
| 7 | IGNRZ_OV | RW | 1b | Output overvoltage response setting 0b: The device continues operation (i.e., ignores the fault) without interruption (note that the bit[7] IGNRZ_OV is active low so that when IGNRZ_OV=0, the fault is ignored). 1b: The device shuts down (disables the output) and responds according to the retry setting in bits RS_OV. Note that if an OV fault occurred while IGNRZ_OV is set to ignore the fault (0b) and if the fault status was not cleared through CLEAR_FAULTS, and if IGNRZ_OV is changed to 1b, the device will respond to the previous fault as programmed in RS_OV and TD_OV. |
| 6 | R | 0b | Not used and always set to 0. | |
| 5:3 | RS_OV | RW | NVM | Output voltage over voltage retry setting. 000b: Latch-off after the fault. A VCC power cycle or EN toggle can restart the power conversion. 111b: Automatically restart after a 52ms delay, without limitation on the number of restart attempts. Any value other than 000b or 111b will not be accepted and such an attempt shall be considered as invalid data or usupported data (ivd) and the device will respond as described in ivd. Since all 3 bits must be the same, only one bit (bit 5) is stored in EEPROM. |
| 2:0 | TD_OV | R | 000b | Output over voltage retry time delay setting. 000b: The device does not delay a restart, and is only supported with RS_OV = 000b. The output remains disabled until the fault is cleared. 111b: The device waits 52ms before it goes through a normal startup. This is only supported whel RS_OV = 111b. These bits are direct reflections of the RS_OV values. Any values written to these read only bits will be ignored. |