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ZXGD3101N8TC

P1-P3P4-P6P7-P9P10-P12P13-P14
ZXGD3101N8
Document Number DS31945 Rev. 1 - 2
4 of 14
www.diodes.com
June 2010
© Diodes Incorporated
ZXGD3101N8
A
Product Line o
f
Diodes Incorporated
SYNCHRONOUS RECTIFIER CONTROLLER
Schematic Symbol and Pin Out Details
Differential
amplifier
High volt
comparator
Threshold
voltage
control
Driver
Gate drive
amplitude
control
Turn-on/off
control
+
+
-
-
GATEH
GATEL
Vcc
GND
DRAIN
REF BIAS
Pin No. Symbol Description and function
1 NC
No connection
This pin can be connected to GND
2 REF
Reference
This pin is connected to V
CC
via resistor, R
REF
. R
REF
should be selected to source approximately 3mA into this pin.
(Note 8)
3 GATEL
Gate turn off
This pin sinks current, I
SINK
, from the synchronous MOSFET Gate.
4 GATEH
Gate turn on
This pin sources current, I
SOURCE
, to the synchronous MOSFET Gate.
5
V
CC
Power Supply
This is the supply pin. It is recommended to decouple this point to ground closely with a ceramic capacitor.
6 GND
Ground
This is the ground reference point. Connect to the synchronous MOSFET Source terminal.
7 BIAS
Bias
This pin is connected to V
CC
via resistor, R
BIAS
. R
BIAS
should be selected to source 1.6 times I
REF
into this pin.
(Note 9)
8 DRAIN
Drain connection
This pin connects directly to the synchronous MOSFET Drain terminal.
Notes: 8. REF pin should be assumed to be at GND +0.7V.
9. BIAS pin should be assumed to be at GND +0.3V.
ZXGD3101N8
Document Number DS31945 Rev. 1 - 2
5 of 14
www.diodes.com
June 2010
© Diodes Incorporated
ZXGD3101N8
A
Product Line o
f
Diodes Incorporated
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.
Drain
current
zero
Body Diode
Conduction
MOSFET
Gate Current
ZXGD3101N8
Document Number DS31945 Rev. 1 - 2
6 of 14
www.diodes.com
June 2010
© Diodes Incorporated
ZXGD3101N8
A
Product Line o
f
Diodes Incorporated
SYNCHRONOUS RECTIFIER CONTROLLER
1a) Continuous Conduction Mode (CCM)
1b) Critical Conduction Mode (CrCM)
1c) Discontinuous Conduction Mode (DCM)
Figure 1: Typical waveforms
P1-P3P4-P6P7-P9P10-P12P13-P14

ZXGD3101N8TC

Mfr. #:
Buy ZXGD3101N8TC
Manufacturer:
Diodes Incorporated
Description:
Gate Drivers SYNC REC Controller Vcc 15V 25mA 490mA
Lifecycle:
New from this manufacturer.
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