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PDF ZXGD3101N8 Data sheet ( Hoja de datos )
| Número de pieza | ZXGD3101N8 | |
| Descripción | SYNCHRONOUS RECTIFIER CONTROLLER | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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A Product Line of
Diodes Incorporated
ZXGD3101N8
SYNCHRONOUS RECTIFIER CONTROLLER
Description
The ZXGD3101 is intended to drive MOSFETS configured as ideal
diode replacements. The device is comprised of a differential amplifier
detector stage and high current driver. The detector monitors the
reverse voltage of the MOSFET such that if body diode conduction
occurs a positive voltage is applied to the MOSFET’s Gate pin.
Once the positive voltage is applied to the Gate the MOSFET
switches on allowing reverse current flow. The detectors’ output
voltage is then proportional to the MOSFET Drain-Source reverse
voltage drop and this is applied to the Gate via the driver. This action
provides a rapid turn off as current decays.
Application
• Flyback Converters in:
• Adaptors
• LCD Monitors
• Server PSU’s
• Set Top Boxes
• LLC Converter in:
• High Power Adaptors
• LCD TV
• Street Lighting
Refer to documents: AN54, AN69, DN90, DN91 and DN94 available
from the website
Features
• Turn-off propagation delay 15ns and turn-off time 20ns.
• Suitable for Discontinuous Mode (DCM), Critical
Conduction Mode (CrCM) and Continuous Mode (CCM)
operation
• Compliant with Energy Star V2.0 and European Code of
Conduct V3
• Halogen Free part
• 5-15V Vcc range
Mechanical Data
• Case: SO-8
• Marking Information: See Page 13
Ordering Information
Product
ZXGD3101N8TC
Status
Active
Package
SO-8
Marking
ZXGD3101
Reel size (inches)
13
Tape width (mm)
12
Quantity per reel
2500
ZXGD3101N8
Document Number DS31945 Rev. 1 - 2
1 of 14
www.diodes.com
June 2010
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
A Product Line of
Diodes Incorporated
ZXGD3101N8
SYNCHRONOUS RECTIFIER CONTROLLER
Operation
Normal Operation
The operation of the device is described step-by-step with reference to the timing diagram below.
1. The detector monitors the MOSFET Drain-Source voltage.
2. When, due to transformer action, the MOSFET body diode is forced to conduct there is approximately -0.6V on the Drain pin.
3. The detector outputs a positive voltage with respect to ground, this voltage is then fed to the MOSFET driver stage and current is sourced out of
the GATEH pin.
4. The current out of the GATEH pin is sourced into the synchronous MOSFET Gate to turn the device on.
5. The GATEH output voltage is now proportional to the Drain-Source voltage drop across the MOSFET due to the current flowing through the
MOSFET.
6. MOSFET conduction continues until the drain current reaches zero.
7. At zero current the detector output voltage is zero and the synchronous MOSFET Gate voltage is pulled low by the GATEL, turning the device
off.
Body Diode
Conduction
Drain
current
zero
MOSFET
Gate Current
ZXGD3101N8
Document Number DS31945 Rev. 1 - 2
5 of 14
www.diodes.com
June 2010
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
A Product Line of
Diodes Incorporated
ZXGD3101N8
SYNCHRONOUS RECTIFIER CONTROLLER
Figure 4: Example connections for LLC converter
Figure 5: Example connections for Forward converter
ZXGD3101N8
Document Number DS31945 Rev. 1 - 2
11 of 14
www.diodes.com
June 2010
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
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