NCP1500
Thermal Shutdown
Internal Thermal Shutdown circuitry is provided to
protect the integrated circuit in the event at the maximum
junction temperature is exceeded. When activated, typically
at 150 ° C, the PWM latch is reset and the linear regulator
control circuitry is disabled. The thermal shutdown circuit
is designed with 25 ° C of hysteresis. This means that the
V IN
SHD
PWM latch and the regulator control circuitry cannot be
re ? enabled until the die temperature drops by this amount.
This feature is provided to prevent catastrophic failures from
accidental device overheating. It is not intended as a
substitute for proper heatsinking . The NCP1500 is
contained in the Micro8 package.
1.5 V
1.3 V
1.0 V
1.8 V
V O
CB0
CB1
Figure 7. Power ? Up and Power ? Down Sequence
http://onsemi.com
9
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