DatasheetsPDF.com

NCP4302 Dataheets PDF



Part Number NCP4302
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description Synchronous Rectification Controller
Datasheet NCP4302 DatasheetNCP4302 Datasheet (PDF)

NCP4302 Secondary Side Synchronous Flyback Controller The NCP4302 is a full featured controller and driver that provide all the control and protection functions necessary for implementing a synchronous rectifier operation in a flyback converter. With the use of the NCP4302, the space conscious flyback applications such as Adaptors, chargers, set top boxes can achieve significant efficiency improvements at minimal extra cost. In addition to the synchronous rectifier control, the IC incorporates .

  NCP4302   NCP4302


Document
NCP4302 Secondary Side Synchronous Flyback Controller The NCP4302 is a full featured controller and driver that provide all the control and protection functions necessary for implementing a synchronous rectifier operation in a flyback converter. With the use of the NCP4302, the space conscious flyback applications such as Adaptors, chargers, set top boxes can achieve significant efficiency improvements at minimal extra cost. In addition to the synchronous rectifier control, the IC incorporates an accurate TL431 type shunt regulator, current monitoring circuit and optocoupler driver to provide a single IC secondary solution. The NCP4302 works with any type of flyback topology (continuous mode, Quasi−resonant mode or discontinuous mode) – providing a high level of versatility. Features • Self−contained Control of Synchronous Rectifier in CCM, DCM, and QR Flyback Applications • Interface to External Signal for CCM Mode • True Secondary Zero Current Detection • High Gate Drive Currents (2.5 A Source/Sink) • High Voltage Operation • Current Sense Flexibility (MOSFET RDS(on) OR CS Resistor) • Accurate Low Voltage Reference − NCP4302A 2.55 V, 1% − NCP4302B 1.275 V, 1% • Programmable Independent Secondary Side ton and toff Delays • Maximum Frequency of Operation up to 250 kHz • These are Pb−Free Devices Typical Applications • Notebook Adapters • LCD TV Adapters • Consumer Appliances such as DVD, VCR • Power Over Ethernet Applications (IP phones, Wireless Access Points) • Battery Chargers www.onsemi.com 8 1 x A L Y W G SO−8 D SUFFIX CASE 751 MARKING DIAGRAM 8 4302x ALYW G 1 = Reference Voltage (A or B) = Assembly Location = Wafer Lot = Year = Work Week = Pb−Free Package PIN CONFIGURATION SYNC/CS 1 TRIG 2 CATH 3 VREF 4 8 VCC 7 DRV 6 GND 5 DLYADJ (Top View) ORDERING INFORMATION Device Package Shipping† NCP4302ADR2G SO−8 2500/Tape & Reel (Pb−Free) NCP4302BDR2G SO−8 2500/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 Specifications Brochure, BRD8011/D. © Semiconductor Components Industries, LLC, 2015 May, 2015 − Rev. 4 1 Publication Order Number: NCP4302/D NCP4302 PIN DESCRIPTION Pin Number Symbol 1 SYNC/CS 2 TRIG 3 CATH 4 VREF 5 DLYADJ 6 GND 7 DRV 8 VCC Description Connected to the flyback winding. The current on this pin is sensed and used to turn on the Synchronous Rectification MOSFET (SRFET). This pin is also used to sense the zero crossing of the MOSFET current either using the RDS(on) of the SRFET or using an external current sense resistor connected between drain of the SRFET and the flyback winding. Input pin for direct turn−off of the MOSFET. Typically connected to a signal from primary controller (for CCM mode) or a signal derived from the transformer (for QR mode). Has very short propagation delay to output (<50 ns). Feedback compensation pin for the TL431 shunt regulator. Has the capability to sinking 10 ma of opto current. Output voltage feedback through resistive divider connected to this pin. Regulated at 1.28 V (option B) or 2.55 V (option A). A resistive divider between the power supply output and ground with the center point tied to the DLYADJ input pin allows for independent adjustment of the minimum ton and toff delay time. The maximum external capacitance from this pin to ground is 25 pF. Return pin for the controller – connected to the output return. Drive output for external MOSFET – 2.5 A peak drive capability, internally clamped to 13.5 V (Maximum) Bias voltage for the controller. Maximum voltage is 28 V. MAXIMUM RATINGS Rating Symbol Value Unit Power Supply Input Current VCC −0.3 to 28 V ICC 100 mA Drive Voltage Current VDRV −0.3 to 18 100 V mA Drive Current Source Sink IDRV 2.5 −2.5 Apk Analog and Logic Inputs Maximum Voltage Current TRIG, VREF, DLYADJ SYNC/CS −0.3 to 10 100 − 10 to 95 100 V mA V mA Operating Junction Temperature Range TJ −40 to 125 °C Maximum Junction Temperature TJmax 150 °C Storage Temperature Range TSmax −65 to 150 °C Lead Temperature (Soldering, 10 s) TLmax 300 °C Reference input Current, continuous IREF −0.05 to 10 mA Total Power Dissipation PD 225 mW Thermal Resistance Junction−to−Ambient qJA 178 °C/W Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 1. This device series contains ESD protection and exceeds the following tests: Pin 1−8: Human Body Model 2000 V per JEDEC Standard JESD22, Method A114E. Machine Model (MM) 200 V per JEDEC Standard JESD22, Method A115A. 2. This device contains Latch−up protection and exceeds ±100 ma per JEDEC Standard JESD78 www.onsemi.com 2 NCP4302 VCC DRV GND CS in VCC Mngt. UVLO ON 10.4 V UVLO OFF.


IR3500 NCP4302 SP7680


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)