Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies

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Overview

The NCP4305 is high performance driver tailored to control a synchronous rectification MOSFET in switch mode power supplies. Thanks to its high performance drivers and versatility, it can be used in various topologies such as DCM or CCM flyback, quasi resonant flyback, forward, and half bridge resonant LLC.

The combination of externally adjustable minimum off-time and on-time blanking periods helps to fight the ringing induced by the PCB layout and other parasitic elements. A reliable and noise less operation of the SR system is insured due to the Self Synchronization feature. The NCP4305 also utilizes Kelvin connection of the driver to the MOSFET to achieve high efficiency operation at full load and utilizes a light load detection architecture to achieve high efficiency at light load.

The precise turn−off threshold, extremely low turn−off delay time and high sink current capability of the driver allow the maximum synchronous rectification MOSFET conduction time and enables maximum SMPS efficiency. The high accuracy driver and 5 V gate clamp enables the use of GaN MOSFETs.

  • High Power Density AC/DC Power Supplies
  • Notebook Adapters
  • Server Power Supplies
  • ATX & All-in-one Power Supplies
  • High Density USB Adapters
  • Precise True Secondary Zero Current Detection with Adjustable Threshold
  • Typically 20 ns Turn off Delay from Current Sense Input to Driver
  • Zero Current Detection Pin Capability up to 200 V
  • Optional Ultrafast (7ns) Trigger Input
  • Disable Input
  • Adjustable Minimum ON Time and Minimum OFF Time
  • Self Synchronization
  • 8 A Sink, 4 A Source Drive capability
  • Light Load Detection with Modulated Gate Drive
  • 4.5 V & 9 V UVLO Options and 36 V(Max)

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Reference Price

NCP4305ADR2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-8

3

260

REEL

2500

N

37

N/A

0.0056

-40

125

Price N/A

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NCP4305AMTTWG

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Lifetime

CAD Model

Pb

A

H

P

WDFN-8

1

260

REEL

3000

N

37

N/A

0.0056

-40

125

$0.5333

More Details

NCP4305DDR2G

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Active

CAD Model

Pb

A

H

P

SOIC-8

3

260

REEL

2500

N

37

N/A

0.006

-40

125

$0.5573

More Details

NCP4305DMNTWG

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Active

CAD Model

Pb

A

H

P

DFN-8

1

260

REEL

4000

N

37

N/A

0.006

-40

125

$0.56

More Details

NCP4305DMTTWG

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Active

CAD Model

Pb

A

H

P

WDFN-8

1

260

REEL

3000

N

37

N/A

0.006

-40

125

$0.5333

More Details

NCP4305QDR2G

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Last Shipments

CAD Model

Pb

A

H

P

SOIC-8

3

260

REEL

2500

N

37

N/A

0.006

-40

125

Price N/A

More Details

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