TPS546C23 Datasheet, PDF (53/97 Pages) Texas Instruments – 4.5-V to 18-V, 35-A Stackable Synchronous Buck Converters With PMBus

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TPS546C23
SLUSCC7A – JULY 2016 – REVISED AUGUST 2016
The IOUT_OC_WARN_LIMIT takes a two byte data word formatted as shown below:
COMMAND
Format
Bit Position
Access
Function
Default Value
IOUT_OC_WARN_LIMIT
Linear, two's complement binary
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
r
r
r
r
r
r
r
r
r
r/w r/w r/w r/w r/w r/w r/w
Exponent
Mantissa
See Below
7.6.24.1 Exponent
default: 11111 (binary) –1 (decimal) (0.5 A)
These default settings are not programmable.
7.6.24.2 Mantissa
The upper four bits are fixed at 0.
Lower seven bits are programmable.
The actual output warning current level for a given mantissa and exponent is:
I_{OUT (OCW )} = Mantissa × 2^Exponent
Mantissa
=2
The default values and allowable ranges for each device are summarized below:
TPS546C23
DEVICE
OC_WARN_LIMIT
MIN
DEFAULT
MAX
4
37
50
(11)
UNIT
A
7.6.25 OT_FAULT_LIMIT (4Fh)
The OT_FAULT_LIMIT command sets the value of the temperature, in degrees Celsius, that causes an
overtemperature fault condition, when the sensed temperature from the external sensor exceeds this limit.
The OT_FAULT_LIMIT must always be greater than the OT_WARN_LIMIT. Writing a value to OT_FAULT_LIMIT
less than or equal to OT_WARN_LIMIT causes the device to set the CML bit in the STATUS_BYTE and the
invalid data (ivd) bit in the STATUS_CML registers as well as asserts the SMBALERT signal. The contents of
this register can be stored to nonvolatile memory using the STORE_DEFAULT_ALL command.
The OT_FAULT_LIMIT takes a two byte data word formatted as shown below.
COMMAND
Format
Bit Position
Access
Function
Default Value
OT_FAULT_LIMIT
Linear, two's complement binary
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
r
r
r
r
r
r
r
r
r/w^E r/w^E r/w^E r/w^E r/w^E r/w^E r/w^E r/w^E
Exponent
Mantissa
0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
7.6.25.1 Exponent
default: 00000 (binary) 0 (decimal) (represents mantissa with steps of 1 degree Celcius)
These default settings are not programmable.
7.6.25.2 Mantissa
default: 000 1001 0001 (binary) 145 (decimal) (145°C)
Minimum: 000 0111 1000 (binary) (equivalent OTF = 120°C)
Maximum: 000 1010 0101 (binary) (equivalent OTF = 165°C)
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