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SC4150LISTRT Datasheet(PDF) 6 Page - Semtech Corporation |
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SC4150LISTRT Datasheet(HTML) 6 Page - Semtech Corporation |
6 / 12 page 6 2004 Semtech Corp. www.semtech.com SC4150 POWER MANAGEMENT Insertion of a power circuit board into a live backplane would draw enormous inrush currents. This is mostly due to the charging of the bulk electrolytic capacitors at the input of the power module being plugged in. The transient currents would send glitches all over the power system and could cause corruption of the signals and even a power down if the source isn’t able to handle these high surges. This section describes the components selection needed for a typical application utilizing the SC4150. Let’s assume the following requirements for a representative system: Input voltage range: 36V to 72V Nominal current: 2A typ. Over-current condition: 5A Bulk capacitance: Cload = 150µF The schematic in Figure 2 combines internal function blocks along with the external components of the application circuit. Resistors R1, R2 and R3 make up a voltage divider to set the Under-Voltage (UV) and Over-Voltage (OV) trip points. When the input power supply ramps up the UV trips at 1.273V and OV trips at 1.223V; during the ramp down transition the UV trips at 1.223V and OV trips at 1.198V. The 50mV hysteresis for UV and 25mV hysteresis for OV provide the necessary guard-bands to prevent false tripping during power up and power down conditions. As an additional noise killing and stabilizing measure, the capacitor C1 should be placed at the OV terminal with the value in range from 1,000 to 10,000pF. For the UV=38V and OV=70V the values of the resistor can be calculated as follows: Vuv = 1.273V · (R1+R2+R3) ÷ (R2+R3) Vov = 1.223V · (R1+R2+R3) ÷ R3 Applications Information Figure 2 60mV + _ _ + _ + _ + + _ +7V Delay DRAIN GATE SENSE Vee Vcc 12.5V Reg 1.223V 1.75V PWRGD 50uA UV OV Timer Q1 R4 Cload 150uF C3 R5 R1 R2 R3 C2 -48V +48V C1 R6 |
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