NCP4304A, NCP4304B Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies www.onsemi.com The NCP4304A/B is a full featured controller and driver tailored to control synchronous rectification circuitry in switch mode power supplies. Due to its versatility, it can be used in various topologies such 8 as flyback, forward and Half Bridge Resonant LLC. 1 1 The combination of externally adjustable minimum on and off times SOIC8 DFN8 helps to fight the ringing induced by the PCB layout and other D SUFFIX MN SUFFIX parasitic elements. Therefore, a reliable and noise less operation of the CASE 751 CASE 488AF SR system is insured. The extremely low turn off delay time, high sink current capability MARKING DIAGRAMS of the driver and automatic package parasitic inductance 8 compensation system allow to maximize synchronous rectification NCP 4304x 4304x MOSFET conduction time that enables further increase of SMPS ALYW ALYW efficiency. 1 Finally, a wide operating V range combined with two versions of CC driver voltage clamp eases implementation of the SR system in 24 V SOIC8 DFN8 output applications. 4304x = Specific Device Code x = A or B A = Assembly Location Features L = Wafer Lot Self-Contained Control of Synchronous Rectifier in CCM, DCM, Y = Year and QR Flyback Applications W = Work Week Precise True Secondary Zero Current Detection with Adjustable = PbFree Package Threshold (*Note: Microdot may be in either location) Automatic Parasitic Inductance Compensation Input PINOUT INFORMATION Typically 40 ns Turn off Delay from Current Sense Input to Driver Zero Current Detection Pin Capability up to 200 V VCC DRV 1 8 2 7 MIN TOFF GND Optional Ultrafast Trigger Interface for Further Improved MIN TON 3 6 COMP Performance in Applications that Work in Deep CCM 4 5 TRIG/DIS CS Disable Input to Enter Standby or Low Consumption Mode (NOTE: For DFN the exposed pad must be either Adjustable Minimum On Time Independent of V Level CC unconnected or preferably connected to ground. Adjustable Minimum Off Time Independent of V Level CC The GND pin must be always connected to ground.) 5 A/2.5 A Peak Current Sink/Source Drive Capability ORDERING INFORMATION Operating Voltage Range up to 30 V Gate Drive Clamp of Either 12 V (NCP4304A) or 6 V (NCP4304B) Device Package Shipping Low Startup and Standby Current Consumption NCP4304ADR2G SOIC8 2,500 / (PbFree) Tape & Reel Maximum Frequency of Operation up to 500 kHz NCP4304BDR2G SOIC8 2,500 / SOIC8 Package (PbFree) Tape & Reel These are PbFree Devices NCP4304AMNTWG DFN8 4,000 / (PbFree) Tape & Reel Typical Applications NCP4304BMNTWG DFN8 4,000 / Notebook Adapters (PbFree) Tape & Reel High Power Density AC/DC Power Supplies For information on tape and reel specifications, Gaming Consoles including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications All SMPS with High Efficiency Requirements Brochure, BRD8011/D. Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: March, 2016 Rev. 6 NCP4304/DNCP4304A, NCP4304B NCP4304 C2 R VCC DRV MIN TOFF MIN TOFF GND MIN TON COMP TRIG/DIS CS R MIN TON +Vbulk +Vout TR1 M1 M3 N2 + C4 LLC STAGE RTN CONTROL N1 M2 N3 M4 C1 NCP4304 C3 R MIN TOFF VCC DRV MIN TOFF GND MIN TON COMP TRIG/DIS CS R MIN TON D1 OK1 Figure 1. Typical Application Example LLC Converter Vbulk TR1 + C1 R1 C2 +Vout D3 + V CC M2 C5 + D4 GND C3 FLYBACK CONTROL CIRCUITRY C4 DRV M1 R MIN TOFF VCC R3 DRV FB CS MIN TOFF GND MIN TON COMP R2 TRIG/DIS R4 CS R MIN TON R5 D5 OK1 R6 Figure 2. Typical Application Example DCM or QR Flyback Converter www.onsemi.com 2