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HV311 Datasheet(PDF) 1 Page - Supertex, Inc |
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HV311 Datasheet(HTML) 1 Page - Supertex, Inc |
1 / 17 page ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com HV311 Features 10 to 90V operation, positive or negative supply UV/OV lock out & power-on-reset Circuit breaker 100ms startup timer Automatic retry or latched operation Low Power, 400µA sleep mode Active low power good 8-Lead SOIC package Applications 48V central office switching 24V cellular and fixed wireless systems 24V PBX systems Line cards 48V powered ethernet for VoIP Distributed power systems Power supply control 48V storage networks Electronic circuit breaker ► ► ► ► ► ► ► ► ► ► ► ► ► ► ► ► ► General Description The Supertex HV311 Hot Swap Controller provides inrush current limiting and other power supply support functions for hot swap equipment. Current limiting is provided by control of an external MOSFET which is placed in the return line of the power supply connection. Placement in the return allows use of an N-channel MOSFET without the need for high side driving. An internal clamp at the GATE pin activates when full bias for the HV311 is not available, thus keeping the MOSFET in the off-state during the initial insertion phase. As soon as adequate bias is available for the main control circuits, the UV (undervoltage) and OV (overvoltage) pins check for normal operating voltage on the power supply input. Once normal operating voltage is present, the GATE voltage for the external MOSFET ramps up at a constant rate. The rate is controlled by the value of an external capacitor placed at the RAMP pin. At some point the external MOSFET channel is enhanced, allowing power supply current to flow, thereby energizing downstream power supply capacitors. During the GATE ramp up the power supply current is monitored with the aid of an external sense resistor which forces reduction in the ramp rate when the power supply current reaches a set limit. The limit is set by the value of the external sense resistor and the threshold of the current sense amplifier (50mV). Once inrush current subsides, the GATE voltage resumes its rise to the output voltage of an internal regulator V REG, with an output voltage ranging from 8.5 to 12V. When GATE is within 1.2V of V REG, GATE is pulled high to VREG with an internal switch, the open-drain PWRGD pin pulls low, and the HV311 enters a low power mode. The HV311 includes a start-up timer and a circuit breaker function to protect the MOSFET from excessive power dissipation. The start-up timer trips when the start-up phase exceeds 100ms. The circuit breaker trips at double the current limit threshold (100mV). Upon tripping of either the start-up timer or the circuit breaker the MOSFET is turned off, and the PWRGD pin becomes high impedance. Thereafter, a programmable automatic retry timer allows the MOSFET to cool down before resetting and restarting. The automatic retry can be disabled by adding an external resistor at the RAMP pin (about 2.5MΩ, see applications section). Typical Application Circuit Hot Swap Controller VDD UV OV VEE SENSE GATE -48V R4 12.5mΩ R1 487kΩ R2 6.81kΩ R3 9.76kΩ Q1 IRF530 C LOAD +5.0V HV311 8 3 2 5 4 COM DC/DC PWM CONVERTER 1 GND NOTES: 1. Undervoltage threshold (UV) set to 35V. 2. Overvoltage threshold (OV) set to 65V. 3. Startup current set to 4A. 4. Circuit breaker set to 8A. 5. 100ms max startup time. 6. Automatic retry enabled. PWRGD ENABLE 6 RAMP 7 C1 10nF -48V |
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