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SMH4812 Datasheet(PDF) 10 Page - Summit Microelectronics, Inc. |
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SMH4812 Datasheet(HTML) 10 Page - Summit Microelectronics, Inc. |
10 / 19 page 10 SMH4812 2055 4.0 12/22/00 SUMMIT MICROELECTRONICS, Inc. Preliminary Current Regulation The current regulation mode is an optional feature that provides a means to regulate current through the MOS- FET for a programmable period of time. See Figures 5a and 5b. If enabled the device will start the internal timer when the voltage at CBSENSE exceeds 50mV (A & G, H). Also, it attempts to limit the voltage at CBSENSE to 60mV by regulating the VGATE output (B & C vs. I). The circuit breaker will trip if the over-current condition remains after the time-out (D, E, F; & J, K, L). However, if CBSENSE drops below 50mV before the timer ends, the timer is reset and VGATE resumes normal operation. If the Quick-Trip level is exceeded then the device will bypass the current regulation timer and shut down immediately. The Current Regulation feature is disabled in the default configuration. Non-Volatile Fault Latch The SMH4812 also provides an optional nonvolatile fault latch (NVFL) circuit breaker feature. The nonvolatile fault latch essentially provides a programmable fuse on the circuit breaker. When enabled the nonvolatile fault latch will be set whenever the circuit breaker trips. Once set, it cannot be reset by cycling power. NOTE: THE DEVICE REMAINS PERMANENTLY DISABLED UNTIL IT IS REPROGRAMMED AT THE FACTORY . As long as the NVFL is set, the FAULT# output will be driven active. The Non-Volatile Fault Latch feature is disabled in the default configuration. Resetting FAULT# When the circuit breaker trips the VGATE output is turned off and FAULT# is driven low. In the default condition the breaker resets automatically after a time of tCYC. In the latched condition cycling power to the board or toggling the EN/TS input 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 5.a. Current Regulation & Shutdown Figure 5.b. Current Regulation & Shutdown VGATE 0V 0V FAULT# CBSENSE 50mV 12V 1 0 A D C B E F 2055 Fig05a VGATE 0V 0V FAULT# CBSENSE 50mV 12V 1 0 G J H K I L 2055 Fig05b |
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