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SMH4812 数据表(PDF) 3 Page - Summit Microelectronics, Inc. |
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SMH4812 数据表(HTML) 3 Page - Summit Microelectronics, Inc. |
3 / 19 page 3 2055 4.0 12/22/00 SMH4812 SUMMIT MICROELECTRONICS, Inc. Preliminary PIN CONFIGURATION PIN DESCRIPTIONS DRAIN SENSE (1) The DRAIN SENSE input monitors the voltage at the drain of the external power MOSFET switch with respect to VSS. An internal 10µA source pulls the DRAIN SENSE signal towards the 5V reference level. DRAIN SENSE must be held below 2.5V to enable the PG outputs. EN/TS (3) The Enable/Temperature Sense input is the master en- able input. If EN/TS is less than 2.5V, VGATE will be disabled. This pin has an internal 200kW pull-up to 5V. PD1#, PD2# (4, 5) These are logic level active low inputs that can optionally be employed to enable VGATE and the PG outputs when they are at VSS. These pins each have an internal 50kW pull-up to 5V. CBSENSE (7) The circuit breaker sense input is used to detect over- current conditions across an external, low value sense resistor (RS) tied in series with the Power MOSFET. A voltage drop of greater than 50mV across the resistor for longer than tCBD will trip the circuit breaker. A program- mable Quick-Trip sense point is also available. UV (9) The UV pin is used as an under-voltage supply monitor, typically in conjunction with an external resistor ladder. VGATE will be disabled if UV is less than 2.5V. Program- mable internal hysteresis is available on the UV input, adjustable in increments of 62.5mV. Also available is a filter delay on the UV input. OV (10) The OV pin is used as an over-voltage supply monitor, typically in conjunction with an external resistor ladder. VGATE will be disabled if OV is greater than 2.5V. A filter delay is available on the OV input. VGATE (2) The VGATE output activates an external power MOSFET switch. This signal supplies a constant current output (100µA typical), which allows easy adjustment of the MOSFET turn on slew rate. FAULT# (6) FAULT# is an open-drain, active-low output that indicates the fault status of the device. 5VREF (11) This is a precision 5V output reference voltage that may be used to expand the logic input functions on the SMH4812. The reference output is with respect to VSS. 2.5VREF (12) This is a precision 2.5V output reference voltage that may be used to expand the logic input functions on the SMH4812. The reference output is with respect to VSS. FS# (13) The Forced Shutdown (FS#) pin is an active low input that causes VGATE and PG outputs to be shut down at any time after an internal hold-off timer has expired. The hold- off timer allows supervisory circuits on the secondary side (which are not powered up initially) to control shut down of the SMH4812 via an opto-isolator. This input has no pull- up resistor. DRAIN SENSE VGATE EN/TS PD1# PD2# FAULT# CBSENSE VSS VDD PG# ENPG FS# 2.5VREF 5VREF OV UV 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 2055 PCon 2.0 |
类似零件编号 - SMH4812 |
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类似说明 - SMH4812 |
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