ISL78226 Datasheet, PDF (64/94 Pages) Intersil Corporation – Cycle-by-cycle peak current limiting

ISL78226
BAT48 Input Overvoltage Limit Fault Control Bit (0xB8: Bit 5:4)
If the individual fault response enable/disable control bit (0xB0[7]) is “1”, the device selects the fault response when BAT48 input
voltage exceeds the second level of overvoltage threshold. When the individual fault response enable/disable control bit (0xB0[7]) is
“0”, the “MODE” pin setting will be used for the fault control and this register setting will be ignored.
BIT1
BIT0
DESCRIPTION
0
0
Flagging only (Default)
When BAT48 input voltage exceeds the second overvoltage threshold, the corresponding fault status register
(0xD7[6]) will be set to “1”, and XALERT will be pulled low. The system continues to operate. No hiccup or latch-off
responses.
0
1
Hiccup (Auto Restart)
When BAT48 input voltage exceeds the second overvoltage threshold, the corresponding fault status register
(0xD7[6]) will be set to “1”, and XALERT will be pulled low. At the same time, the system stops PWM switching. The
PWM switching will recover automatically 500ms (typical) after the overvoltage condition is removed.
1
0
Latch-off
When BAT48 input voltage exceeds the second overvoltage threshold, the corresponding fault status register
(0xD7[6]) will be set to “1”, and XALERT will be pulled low. At the same time, the system stops PWM switching. The
PWM switching will not recover automatically when the overvoltage condition is removed. To recover the switching,
toggle PWM_EN or EN.
1
1
Flagging only (same as “0,0”)
BAT48 Input Undervoltage Limit Fault Control Bit (0xB8: Bit 7:6)
If the individual fault response enable/disable control bit (0xB0[7]) is “1”, the device selects the fault response when BAT12 becomes
lower than the second level of undervoltage threshold. If the individual fault response enable/disable control bit (0xB0[7]) is “0”, the
“MODE” pin setting will be used for the fault control and this register setting will be ignored.
BIT1
BIT0
DESCRIPTION
0
0
Flagging only (Default)
When BAT48 input voltage becomes lower than the second undervoltage threshold, the corresponding fault status
register (0xD7[7]) will be set to “1”, and XALERT will be pulled low. The system continues to operate. No hiccup or
latch-off responses.
0
1
Hiccup (Auto Restart)
When BAT48 input voltage becomes lower than the second undervoltage threshold, the corresponding fault status
register (0xD7[7]) will be set to “1”, and XALERT will be pulled low. At the same time, the system stops PWM
switching. The PWM switching will recover automatically 500ms (typical) after the undervoltage condition is
removed.
1
0
Latch-off
When BAT48 input voltage becomes lower than the second undervoltage threshold, the corresponding fault status
register (0xD7[7]) will be set to “1”, and XALERT will be pulled low. At the same time, the system stops PWM
switching. The PWM switching will not recover automatically when the undervoltage condition is removed. To recover
the switching, toggle PWM_EN or EN.
1
1
Flagging only (same as “0,0”)
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FN8887.0
November 7, 2016