ISL78226 Datasheet, PDF (53/94 Pages) Intersil Corporation – Cycle-by-cycle peak current limiting

ISL78226
BAT48 Output Overvoltage Fault (Warning) Control Bit (0xB2: Bit 1:0)
When the individual fault response enable/disable control bit (0xB0[7]) is “1”, the device selects the fault response when BAT48
exceeds the first 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 output voltage exceeds the first overvoltage threshold, the corresponding fault status register (0xD2[4])
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 output voltage exceeds the first overvoltage threshold, the corresponding fault status register (0xD2[4])
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 output voltage exceeds the first overvoltage threshold, the corresponding fault status register (0xD2[4])
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 Output Undervoltage Fault (Warning) Control Bit (0xB2: Bit 3:2)
When the individual fault response enable/disable control bit (0xB0[7]) is “1”, the device selects the fault response when BAT48 output
voltage become lower than the first level of undervoltage 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 output voltage becomes lower than the first overvoltage threshold, the corresponding fault status
register (0xD2[5]) 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 output voltage becomes lower than the first overvoltage threshold, the corresponding fault status
register (0xD2[5]) 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 output voltage become lower than the first Under voltage threshold, corresponding fault status register
(0xD2[5]) 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