TPS40400 Datasheet, PDF (42/56 Pages) Texas Instruments – 3.0-V TO 20-V PMBus SYNCHRONOUS BUCK CONTROLLER

TPS40400
SLUS930A – APRIL 2011 – REVISED JULY 2011
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IOUT/POUT:
An output current warning or fault has occurred. The PMBus specification states that this also
applies to output power. TPS40400 does not support output power warnings or faults.
POWER_GOOD:
The power good signal is negated.
STATUS_VOUT (7Ah)
The STATUS_VOUT command returns one byte of information relating to the status of the converter's output
voltage related faults. The only bits of this register supported by TPS40400 are VOUT_OV Fault and VOUT_UV
Fault.
Command
STATUS_VOUT
Format
Unsigned binary
Bit Position
7
6
5
4
3
2
1
0
Access
r
r
r
r
r
r
r
r
Function
VOUT OV Fault X
X
VOUT UV Fault
X
X
X
X
Default Value
0
0
0
0
0
0
0
0
A "1" in any of these bit positions indicates that:
VOUT OV Fault:
The device has seen the output voltage rise above the VOUT_OV_FAULT_LIMIT threshold.
VOUT UV Fault:
The device has seen the output voltage fall below the VOUT_UV_FAULT_LIMIT threshold.
STATUS_IOUT (7Bh)
The STATUS_IOUT command returns one byte of information relating to the status of the converter’s output
current related faults. The only bits of this register supported by TPS40400 are IOUT_OC Fault and IOUT_OC
Warning.
Command
STATUS_IOUT
Format
Unsigned binary
Bit Position
7
6
5
4
3
2
1
0
Access
r
r
r
r
r
r
r
r
Function
IOUT_OV Fault
X
IOUT OC Warning
X
X
X
X
X
Default Value
0
0
0
0
0
0
0
0
A "1" in any of these bit positions indicates that:
IOUT_OV Fault:
The device has seen the output current rise above the level set by IOUT_OC_FAULT_LIMIT.
VOUT_UV Fault:
The device has seen the output current rise relating to the level set by IOUT_OC_WARN_LIMIT.
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