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FAN5070 데이터시트(PDF) 2 Page - Fairchild Semiconductor |
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FAN5070 데이터시트(HTML) 2 Page - Fairchild Semiconductor |
2 / 14 page FAN5070 2 REV. 1.0.1 8/7/01 Pin Assignments 20 19 18 17 16 15 14 13 12 11 FAN5070 HIDRV SW GNDA VID4 VID3 VID2 VID1 VID0 VREF NC VCCP LODRV GNDP VCCA VFB DROOP ILIM PWRGD SS/ENABLE NC 1 2 3 4 5 6 7 8 9 10 Pin Definitions Pin Number Pin Name Pin Function Description 1 HIDRV High Side FET Driver. Connect this pin to the gate of an N-channel MOSFET. The trace from this pin to the MOSFET gate should be <0.5". 2SW High Side Driver Source and Low Side Driver Drain Switching Node. Together with DROOP and ILIM pins allows FET sensing for VCC current. 3 GNDA Analog Ground. Return path for low power analog circuitry. This pin should be connected to a low impedance system ground plane to minimize ground loops. 4-8 VID4-0 Voltage Identification Code Inputs. These open collector/TTL compatible inputs will program the output voltage over the ranges specified in Table 1. 9 VREF DAC Output for Test Only. Do not load externally. 10, 11 NC NC. No Connect. 12 ENABLE/SS Output Enable. A logic LOW on this pin will disable all outputs. An internal current source allows for open collector control. This pin also doubles as soft start for all outputs. 13 PWRGD Power Good Flag. An open collector output that will be logic LOW if any output voltage is not within ±14% of the nominal output voltage setpoint. 14 ILIM VCC Current Feedback. Pin 11 is used in conjunction with pin 2 as the input for the VCC current feedback control loop. Layout of these traces is critical to system performance. See Application Information for details. 15 DROOP Droop Set. Use this pin to set magnitude of active droop. 16 VFB Vcc Voltage Feedback. Pin 13 is used as the input for the VCC voltage feedback control loop. See Application Information for details regarding correct layout. 17 VCCA Analog VCC. Connect to system 5V supply and decouple with a 0.1µF ceramic capacitor. 18 GNDP Power Ground. Return pin for high currents flowing in pin 17 (VCCP). 19 LODRV VCC Low Side FET Driver. Connect this pin to the gate of an N-channel MOSFET for synchronous operation. The trace from this pin to the MOSFET gate should be <0.5". 20 VCCP Power VCC. For all FET drivers. Connect to system 12V supply through a 33Ω, and decouple with a 1µF ceramic capacitor. |
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