Analog Devices LTM4683 Manual page 96

LTM4683
PMBus COMMAND DETAILS
IOUT_OC_FAULT_LIMIT
The IOUT_OC_FAULT_LIMIT command sets the value of the peak output current limit, in Amperes. When the control-
ler is in the current limit, the overcurrent detector will indicate an overcurrent fault condition. The following table lists
the programmable peak output current limit value in mV between I
+ –
limit is (I – I
SENSE SENSE
Based on Peak-to-Peak Inductor Current = 50% of 30A for Worse Case, These are Approximates, So use Guardband and Check.
MFR_PWM_MODE[7] = 1
HIGH CURRENT RANGE
(mV)
17.73
18.86
20.42
21.14
22.27
23.41
24.55
NOTE: This is the peak of the current waveform. The READ_IOUT command returns the average current. The peak
output current limits are adjusted with temperature based on the MFR_IOUT_CAL_GAIN_TC using the equation:
Peak Current Limit = IOUT_CAL_GAIN • (1 + MFR_IOUT_CAL_GAIN_TC • (READ_TEMPERTURE_1-27.0)).
The LTM4683 automatically convert currents to the appropriate internal bit value.
The I range is set with bit 7 of the MFR_PWM_MODE command.
OUT
The IOUT_OC_FAULT_LIMIT is ignored during TON_RISE and TOFF_FALL.
If the IOUT_OC_FAULT_LIMIT is exceeded, the device:
• Sets the IOUT bit in the STATUS word
• Sets the IOUT Overcurrent fault bit in the STATUS_IOUT
• Notifies the host by asserting ALERT, unless masked
This command has two data bytes and is formatted in Linear_5s_11s format.
96
)/IOUT_CAL_GAIN in Amperes.
~I PEAK (A) ~I (A)
L OUT
49.95 41.75
52.38 44.88
NA NA
NA NA
NA NA
NA NA
NA NA
For more information
+
and I
SENSE SENSE
MFR_PWM_MODE[7] = 0
LOW CURRENT RANGE (mV)
9.85
10.48
11.34
11.74
12.37
13.01
13.64
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–
. The actual value of the current
~I PEAK (A) ~I
L OUT
27.36 19.50
29.11 21.61
31.5 24
32.61 25.11
34.36 28.86
36.13 28.63
37.88 30.38
(A)
Rev. 0