Datasheet

TIMER
GATE
DRAIN
SENSE
PWRGD
HIGH
Analog
Circuit
Limit
Normal Mode
1
6
V
THVT
V
TLVT
V
CB
V
AC
6PA
4
Gate
Ramp-up
Normal Mode
32
5
60PA
240PA
TIMER
GATE
DRAIN
SENSE
PGOOD
Circuit Breaker
Limit
Normal Mode
1
V
THVT
V
TLVT
V
CB
V
AC
240PA
2
LM5068
SNVS254C –JANUARY 2004–REVISED MARCH 2013 www.ti.com
Figure 30. Circuit Breaker Current Limit Fault
The above timing waveform shows the circuit breaker current limit fault behavior. The timer capacitor is charged
with 240µA when the SENSE pin exceeds V
CB
. If the SENSE pin drops below V
CB
before the TIMER reaches
V
THVT
, the timer capacitor will be discharged with 6µA. In the above figure when TIMER exceeds V
THVT
, GATE is
pulled low immediately to disconnect power to the load.
Figure 31. Analog Current Limit Fault
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