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NCP5383 Dataheets PDF



Part Number NCP5383
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description 2 Phase Buck Controller
Datasheet NCP5383 DatasheetNCP5383 Datasheet (PDF)

NCP5383 2 Phase Buck Controller with Integrated Gate Drivers and AVP The NCP5383 is a two phase buck controller used in low voltage, high current power supplies. Dual-edge pulse-width modulation (PWM) combined with inductor current sensing and adaptive voltage positioning (AVP) reduces system cost by providing the fastest initial response to transient loads thereby requiring less bulk and ceramic output capacitors to satisfy transient load-line requirements. A high performance operational error .

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NCP5383 2 Phase Buck Controller with Integrated Gate Drivers and AVP The NCP5383 is a two phase buck controller used in low voltage, high current power supplies. Dual-edge pulse-width modulation (PWM) combined with inductor current sensing and adaptive voltage positioning (AVP) reduces system cost by providing the fastest initial response to transient loads thereby requiring less bulk and ceramic output capacitors to satisfy transient load-line requirements. A high performance operational error amplifier is provided, which allows for easy compensation of the system. Protection features include overcurrent protection, undervoltage lockout (UVLO), www.DataSheet4U.com thermal shutdown and power good monitor. Features http://onsemi.com MARKING DIAGRAM 1 24 PIN QFN, 4x4 MN SUFFIX CASE 485L 5383 ALYWG G •ăDual-edge PWM for Fastest Initial Response to Transient Loading •ăHigh Performance Operational Error Amplifier •ă1% Internal Reference Voltage Accuracy •ăPhase-to-Phase Current Balancing •ă“Lossless” Differential Inductor Current Sensing •ăDifferential Current Sense Amplifiers for Each Phase •ăAdaptive Voltage Positioning (AVP) •ăFrequency Range: 100 kHz – 400 kHz Set by the Resistor •ăPower Good Output with Internal Delays •ăProgrammable Soft Start Time •ăIntegrated Gate Drivers •ăThis is a Pb-Free Device Applications 5383 A L Y W G = Specific Device Code = Assembly Location = Wafer Lot = Year = Work Week = Pb-Free Package (Note: Microdot may be in either location) PIN CONNECTIONS PG BST1 TG1 SWN1 PGND1 BG1 ROSC ILIM VCC AGND SS COMP VFB VDRP CS1 CSN CS2 EN (Top View) VCCP BG2 PGND2 SWN2 TG2 BST2 •ăPentium IV Processors •ăGraphics Cards •ăLow Voltage, High Current Power Supplies ORDERING INFORMATION Device NCP5383MNR2G Package Shipping† QFN-24 4000 / Tape & Reel (Pb-Free) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. ©Ă Semiconductor Components Industries, LLC, 2007 1 December, 2007 - Rev. 3 Publication Order Number: NCP5383/D NCP5383 SS Vcore 2 FAULT SS 23 BST1 OVP (125% of VFB) UVP (75% of VFB) FB 7 PG + 22 TG1 Gate Driver I 21 18 SWN1 VCCP AGND 4 6 COMP www.DataSheet4U.com VDRP 8 0.8 V 19 Droop Amplifier + 0.8 V 20 BG1 PGND1 CS1 CSN CS2 9 10 + - + - 13 BST2 14 11 + + 15 Gate Driver II VCCP 17 TG2 SWN2 ROSC 1 OSCILLATOR BG2 ILIM 2 + Fault Logic + UVLO 16 24 PGND2 PG EN VCC 12 3 + 9V Figure 1. Simplified Block Diagram http://onsemi.com 2 NCP5383 VCC NCP5383 ROSC ILIM PG SS VCC VCCP BST1 3 18 23 12 V VCCP 1 2 24 5 5V TG1 SWN1 22 21 Vcore BG1 19 www.DataSheet4U.com PGND1 20 VCCP VCC 7 VFB BST2 13 14 15 Vcore TG2 SWN2 6 8 9 10 COMP VDRP CS1 BG2 17 PGND2 CSN EN 11 CS2 AGND 16 12 4 Figure 2. Typical Application Schematic http://onsemi.com 3 NCP5383 PIN DESCRIPTIONS Pin No. 1 Symbol ROSC Description A resistance from this pin to ground programs the oscillator frequency according to fSW = 1 / (ROSC w 100ĂpF). Also, this pin supplies a trimmed output voltage of 2.00 V so it may be used to form a voltage divider at the ILIM pin to set the over current shutdown threshold as shown in the Applications Schematics. Over current shutdown threshold. To program the shutdown threshold, connect this pin to the ROSC pin via a resistor divider as shown in the Applications Schematics. To disable the over current feature connect this pin directly to the ROSC pin. To guarantee correct operation, this pin should only be connected to the voltage generated by the ROSC pin – do not connect this pin to any externally generated voltages. Power for the internal control circuits. Power supply return for the analog circuits that control output voltage. A capacitor from this pin to ground programs the soft-start time. Output of the error amplifier and input to the inverting pin of the PWM comparators. Voltage feedback pin and error amplifier inverting input. Connect a resistor from this pin to VCORE. The value of this resistor and the amount of current from the droop resistor (RDRP) will set the amount of output voltage droop (AVP) during load. Current signal output for Adaptive Voltage Positioning (AVP). The offset of this pin above the no-load set-point is proportional to the output current. Connect a resistor from this pin to VFB to set the amount of AVP current into the feedback resistor (RFB) that will result in output voltage droop. Leave this pin open for no AVP. Non-inverting input to current sense amplifier #x, x = 1, 2 Inverting input to current sense amplifier #x, x = 1 (Tie to VCORE) When this pin is pulled High the controller is enabled. When it is pulled Low the controller will be disabled. Either an open-collector output (with a pull-up resistor) or a logic gate (CMOS or totem-pole output) may be used to drive this pin. A Low to High transition on this pin will induce soft start. If the Enable function is not required, this pin shou.


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