ISL78229 Datasheet, PDF (64/71 Pages) Intersil Corporation – 2-Phase Boost Controller with Drivers

ISL78229
OC_AVG_FAULT_LIMIT (D6h)
Definition: Set/Read the input average overcurrent fault threshold. The input average overcurrent fault is generated by a comparator
comparing the IMON pin voltage with 2V threshold as default. This command sets the OC_AVG fault threshold with 8 options ranging
from 1V to 2V. The default is set at 07h meaning 2V for V_IMON.
Use Equation 33 to convert the OC_AVG fault thresholds in following table to the actual total boost input average current protection
thresholds.
This fault detection is active at the beginning of soft-start (t₅ as shown in Figure 67 on page 30).
When an OC_AVG fault occurs, the corresponding bit in the FAULT_STATUS register is set to 1 and the SALERT pin is pulled low. The
OC_AVG fault protection is by default active and the fault response is either Hiccup or Latch-off determined by the corresponding bit of
FAULT_RESPONSE register of which default value is determined by the HIC/LATCH pin.
For related description, refer to “Average Overcurrent Fault (OC_AVG)” on page 38, Table 3 on page 41 and the related commands in
“PMBus™ Command Summary” on page 43 to deactivate this fault and configure the fault response.
Data Length in Bytes: 1
Data Format: Bit Field
Type: R/W
Protectable: Yes
Default Value: 07h, which equals to 0000_0111b, meaning 2V threshold for the IMON pin voltage (V_IMON) to detect OC_AVG fault.
Units: V
COMMAND
Format
Bit Position
Access
Function
Default Value
7
R/W
0
6
R/W
0
5
R/W
0
OC_AVG_FAULT_LIMIT (D6h)
Bit Field
4
3
R/W
R/W
See Following Table
0
0
2
R/W
1
1
R/W
1
0
R/W
1
BITS 7:3
(NOT USED)
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
BITS 2:0
000
001
010
011
100
101
110
111
OC_AVG THRESHOLD FOR V_IMON (V)
1
1.15
1.25
1.4
1.55
1.7
1.85
2
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FN8656.3
February 12, 2016