SMH4803A Ver la hoja de datos (PDF) - Summit Microelectronics
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SMH4803A Datasheet PDF : 19 Pages
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SMH4803A
Preliminary
Resetting FAULT#
When the circuit breaker trips the VGATE output is turned
off and FAULT# is driven low. There are two methods to
reset the circuit breaker which are selectable with the
MODE pin. When MODE is held high or left floating the
circuit breaker is in the duty-cycle mode, and the breaker
resets automatically after a time of tCYC. When the MODE
pin is held low the circuit breaker can be reset by bringing
RESET# low. T after bringing RESET# back high again
PDD
the VGATE output will attempt to restart the MOSFET slew
control circuitry. In either case, cycling power to the board
will also reset the circuit breaker. If the over current
condition still exists after the MOSFET switches back on
the circuit breaker will re-trip.
CBSENSE
<TCBD
VQCB
50mV
VGATE
TFSTSHTDN
2051 Fig04 1.0
Figure 4. Circuit Breaker Timing — Quick Trip
CBSENSE
TCBD 50mV
TCBD
OV / UV
2.5V
tUOFLTR
VGATE
TCYC
FAULT#
2051 Fig02 1.0
Figure 2. Circuit Breaker Cycle Mode, RESET# High
2051 Fig05 2.0
Figure 5. Under-/Over-Voltage Filter Timing
13
TCBD
50mV
CBSENSE
12
VGATE
TPDD
TRST
11
Temp, ºC
–40
0
25
85
10
125
RESET#
2051 Fig03 1.0
9
0
2
4
6
8
10
12
IDD (mA)
2051 Fig06
Figure 3. Circuit Breaker Timing — Reset Mode
Figure 6. Effect of Temperature on Current Con-
sumption Over Voltage Range
SUMMIT MICROELECTRONICS, Inc.
2051 4.4 3/15/01
9
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