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HV311LG-G Datasheet(PDF) 7 Page - Supertex, Inc |
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HV311LG-G Datasheet(HTML) 7 Page - Supertex, Inc |
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7 / 17 page  7 HV311 ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com Startup Timer The startup timer limits the startup to 100ms. Should there be an overload or short circuit during startup, then the exter- nal pass transistor will carry current for no more than 100ms. Upon tripping of the timer the RAMP and GATE voltages reset to zero, and the autoretry timer starts if enabled. Circuit Breaker The circuit breaker trips in less than 5.0μs when the voltage across the sense resistor reaches 100mV. Upon tripping of the circuit breaker the RAMP and GATE voltages reset to zero, and the autoretry timer starts if enabled. Autoretry Timer The retry interval is determined by charging and discharg- ing the C RAMP capacitor 256 times. One cycle corresponds to charging of C RAMP to 8.0V with a current of 2.5μA, and subse- quent discharging to zero with a current of 2.5μA. Hence: I CHARGE · tCYCLE = CRAMP · 2 · ΔV t CYCLE = (10n)(2)(8)/(2.5μ) t CYCLE = 64ms t AUTORETRY = (256)(64m) t AUTORETRY = 16.4s The autoretry timer can be disabled by adding a resistor at the RAMP pin. A resistor which keeps the RAMP voltage from rising to 8.0V will keep the timer from counting. This can accomplished by adding a resistor at the RAMP pin with a value of about 2.5MΩ. Note that this resistor forms an ad- ditional load during the startup, thereby causing the time in- tervals to increase somewhat. • • • • • Kelvin Connections In order to make an accurate measurement of power supply current it is advisable to make use of Kelvin connections. The idea is to not incur voltage drops in the sense leads due to the main power supply current. See diagram below. Paralleling External MOSFETs Equal current sharing may not be achievable due to the tol- erance issues with the threshold voltage and gain charac- teristics of the MOSFETs. Paralleling of devices is not rec- ommended. The issues with paralleling can be alleviated by using resistor ballasting. For this application the HV311 with active low PWRGD is recommended where the PWRGD pins of multiple hot swap circuits can be connected in a wired OR configuration. To Negative Terminal of Power Source To Source of MOSFET To V EE Pin Sense Resistor To SENSE Pin |
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