SMH4803A datasheet(9/19 Pages) SUMMIT

9 / 19 page

2051 4.4 3/15/01

SMH4803A

Preliminary

SUMMIT MICROELECTRONICS, Inc.

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 t

CYC. When the MODE

pin is held low the circuit breaker can be reset by bringing

RESET# low. T

PDD after bringing RESET# back high again

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.

Figure 2. Circuit Breaker Cycle Mode, RESET# High

CBSENSE

VGATE

TCBD

TCYC

2051 Fig02 1.0

50mV

Figure 3. Circuit Breaker Timing — Reset Mode

Figure 4. Circuit Breaker Timing — Quick Trip

Figure 5. Under-/Over-Voltage Filter Timing

Figure 6. Effect of Temperature on Current Con-

sumption Over Voltage Range

2051 Fig03 1.0

CBSENSE

RESET#

VGATE

TCBD

TPDD

50mV

TRST

2051 Fig04 1.0

CBSENSE

VGATE

<TCBD

TFSTSHTDN

50mV

VQCB

2051 Fig05 2.0

OV / UV

FAULT#

tUOFLTR

2.5V

IDD (mA)

2051 Fig06

Temp, ºC

–40

125

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