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RC5057 数据表(PDF) 2 Page - Fairchild Semiconductor |
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RC5057 数据表(HTML) 2 Page - Fairchild Semiconductor |
2 / 20 page RC5057 PRODUCT SPECIFICATION 2 REV. 1.2.0 2/10/00 Pin Assignments Pin Definitions Pin Number Pin Name Pin Function Description 1 ENABLE/SS Output Enable/Softstart. A logic LOW on this pin will disable the output. An internal current source allows for open collector control. This pin also doubles as soft start. 2 PWRGD Power Good Flag. An open collector output that will be logic LOW if the output voltage is not within ±12% of the nominal output voltage setpoint. 3 IFB Current Feedback. Pin 3 is used in conjunction with pin 10, as the input for the current feedback control loop. Layout of these traces is critical to system performance. See Application Information for details. 4 VFB Voltage Feedback. Pin 4 is used as the input for the voltage feedback control loop. See Application Information for details regarding correct layout. 5 VCCA Analog VCC. Connect to system 5V supply and decouple with a 0.1µF ceramic capacitor. 6 GNDP Power Ground. Return pin for high currents flowing in pin 8 (VCCP). Connect to a low impedance ground. 7 LODRV 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". 8 VCCP Power VCC. For both high side and low side FET drivers. Connect to system 12V supply, and decouple with a 4.7µF tantalum and a 0.1µF ceramic capacitor. 9 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". 10 SW High side driver source and low side driver drain switching node. Together with IFB pin allows FET sensing for current. 11 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. 12–16 VID0-4 Voltage Identification Code Inputs. These open collector/TTL compatible inputs will program the output voltage over the ranges specified in Table 2. Pull-up resistors are internal to the controller. 1 2 3 4 5 6 7 8 9 10 11 12 16 15 14 13 RC5057 ENABLE/SS PWRGD IFB VFB VCCA GNDP LODRV VCCP VID0 VID1 VID2 VID3 VID4 GNDA SW HIDRV |
类似零件编号 - RC5057 |
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类似说明 - RC5057 |
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