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HV302DB1 Datasheet(PDF) 1 Page - Supertex, Inc |
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HV302DB1 Datasheet(HTML) 1 Page - Supertex, Inc |
1 / 2 page HV302DB1 Hotswap Controller rev 0 21MAY021 1 Introduction The Supertex HV302DB1 demo board contains all circuitry necessary to demonstrate the features of the HV302 hotswap controller. Intended primarily as a negative hotswap controller, the HV302 controls the negative supply path. Four sequenced power-good signals are provided, with timing controlled via 3 resistors. Included on board is a 100+F capacitor to provide a capacitive load for testing. Additional capacitance may be connected to the VOUT terminals. Or the 100+F may be removed altogether The board may be modified to meet custom requirements. Instructions are provided on the next page for modifications. Specifications Input Voltage 10V to 90V Inrush Limit 1A ±20% Circuit Breaker Trip 6.7A ±20% Retry Interval 16sec typ On Resistance 40m 8 max Undervoltage Trip 38.0V on, 32.2V off Overvoltage Trip 64.5V on, 70.0V off Power Good Signals PWRGD A PWRGD B PWRGD C PWRGD D Active High ~5ms after CLOAD charged ~200ms after ‘A’ ~100ms after ‘B’ ~5ms after ‘C’ Board Layout and Connections VIN Connect the supply voltage to these terminals. Supply voltage may range from 10 volts to 90 volts. A high source impedance may cause oscillations when the input voltage is near the undervoltage trip point. A high source impedance results in a large voltage drop when loaded, causing undervoltage lockout to kick in, disconnecting the load. With the load removed, input voltage rises, causing undervoltage to release and reconnecting the load. The cycle repeats, resulting in oscillations. Source impedance must be less than the following to avoid oscillations: LOAD SOURCE I R V 3 < VOUT Connect the power supply or other load to these terminals. VOUT+ is connected to VIN+, it is VOUT– that is switched. Application of a DC load during start-up extends the time inrush limiting is active. If this time exceeds 100ms, the HV302 shuts off, retrying as quickly as 12s later. For this reason, DC load at start-up should be less than 900mA. Note that DC start-up load limitation decreases with added load capacitance. Connecting additional load capacitance alters the inrush current limit. See the HV302/312 data sheet for details. PWRGD Connect to the power supply’s ENABLE inputs. Depending on the power supply, it may be necessary to level-translate this signal via opto-isolator or discrete circuit. Refer to the HV302/312 data sheet for a description of PWRGD and related application circuits. PWRGD is an open-drain output. During start-up and whenever VIN is lower than the undervoltage trip point or greater than the overvoltage trip point, PWRGD is pulled down to VIN–. Once VIN is within the proper range and the load capacitance has fully charged, PWRGD assumes a high impedance state. HV302 R10 R9 R8 R4 C3 R7 C4 R6 C2 C1 R5 Q1 C6 DC/DC Converter DC/DC Converter DC/DC Converter DC/DC Converter + – + – + – + – enable enable enable enable VIN first enabled last enabled |
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