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READ_IOUT 0x8C
The A/D count is linear from zero to 125% of nominal output current resulting in a full scale count of 1023d.
Rated output current occurs at a count of 818d. 100% of rated currents are equal to 270-watts divided by the
above output voltages. The coefficient parameters used to translate the data to the actual percentage value of
rated output current information are given below.
Table 10 PMBus direct format coefficient parameters for READ_IOUT
READ_TEMPERATURE_1 0x8D
Returns a 10-bit unsigned integer of the temperature near main transformer. The sensor measurement range is
from -40 °C to 125 °C. The XL270 will shut down when the temperature reaches around 110 °C (data value of
930d). The parameters used to translate the data to the actual temperature information are given below.
Table 11 PMBus direct format coefficient parameters for READ_TEMPERATURE_1
MFR_SPECIFIC_01 0xD1 – Fan Speed Control, Read/Write Byte
Note: During non-default mode, internal thermostat control will override other modes and turn the fan
on at 100% duty cycle if the transformer temperature is above 85 °C.
706679 Rev 09-26-18
Parameter
m
b
R
Parameter
m
b
R
Data Byte
0x00
100% duty cycle (power-on default mode)
0x01
Fixed speed at 0% PWM duty cycle (off)
0x02
Fixed speed at 25% PWM duty cycle
0x03
Fixed speed at 50% PWM duty cycle
0x04
Fixed speed at 75% PWM duty cycle
0x05
Fixed speed at 100% PWM duty cycle (on)
0x06
Internal automatic PWM control:
transformer Temp
Above 74°C
61°C-73°C
48°C-60°C
35°C-47°C
Below 35°C
Table 12 Fan Speed Control Data Byte Usage
8 of 9
Value
8184d
0
-3d
Value
620d
24800d
-2d
Fan Speed Control Mode
Duty Cycle
100% duty cycle (on)
75% duty cycle
50% duty cycle
25% duty cycle
0% duty cycle (off)
E
D
NGINEERING
EPARTMENT
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