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PDF ZXGD3101T8 Data sheet ( Hoja de datos )
| Número de pieza | ZXGD3101T8 | |
| Descripción | Synchronous rectifier controller | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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A Product Line of
Diodes Incorporated
ZXGD3101T8
www.datashSeety4un.cocmhronous rectifier controller for flyback converters.
Zero Point Detector Driver ‘ZPDD’
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.
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
• Low component count
• Halogen free
• 5-15V VCC range
Pin out detail
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.
Applications
Flyback converters in:
• Adaptors
• LCD monitors
• Server PSU’s
• Set top boxes
Refer to documents; AN54, DN90 and DN91
available from the website
Typical configuration
Transformer
N/C
REF
GATEL
GATEH
18
27
36
45
SM8
DRAIN
BIAS
GND
V
CC
R
REF
R
B IA S
REF BIAS Vcc
D R AIN
ZXGD
3101
GATEL GATEH GND
C1
S yn ch ro n o u s R e ctifie r
M OS FE T
Ordering information
Device
Status
ZXGD3101T8TA Active
Package
SM8
Part Mark
ZXGD3101
Reel size
(inches)
7
Tape width
(mm)
12
Quantity
per reel
1000
Issue 3 - November 2008
© Diodes Incorporated 2008
1
www.zetex.com
www.diodes.com
1 page  
ZXGD3101T8
Operation
Normal Operation
www.datasheet4u.com
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 D iode
2 C onduction
MOSFET
D rain Voltage 1
D rain
current
zero
MOSFET
Gate Voltage 3
6
5
MOSFET
Gate Current
4
7
Issue 3 - November 2008
© Diodes Incorporated 2008
5
www.zetex.com
www.diodes.com
5 Page 
www.datasheet4u.com
ZXGD3101T8
R REF
3 kΩ
R BIAS
1.8kΩ
Vcc
REF BIAS Vcc
VD
DRAIN
ZXGD
3101
RH
GATEL GATEH GND
R
L
C2
2200 pF
X7R
C1
1μF
X7R
VG
GND
Figure 4: Test circuit
VD
-600mV
VG
Body Diode
Conduction
Zero
voltage
transition
0V
td1
tr
20mV
tf
90% -20mV
10%
td2
NOTE: GATE H AND GATE L ARE CONNECTED
Figure 5: Timing diagram
Issue 3 - November 2008
© Diodes Incorporated 2008
11
www.zetex.com
www.diodes.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ZXGD3101T8.PDF ] | |
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