ON Semiconductor NCP4306 User Manual
EVBUM2520/D
NCP4306 Synchronous
Rectification
Evaluation
Board User'sManual
Description
This evaluation board user’s manual describes a high efficiency
synchronous rectification evaluation board that can easily replace a
secondary side rectification diode in an SMPS.
The NCP4306 is used as synchronous rectification controller. The
evaluation board has very few external components and illustrates
how small and effective such a design can be.
The NCP4306 features a very precise 0 mV turn−off comparator
that supports even very low current flowing through the MOSFET
even when very low RDSON synchronous MOSFETs is used.
NCP4306 can be used in application working in CCM without
external synchronization thanks to very low propagation delay and
strong driver.
Key Features
• Precise Turn−off Comparator
• Wide Input Voltage Range
• High Operation Frequency
• Strong MOSFET Driver
• High Efficiency
• Adjustable Minimum On and Off Times
• Adjustable Light Load Detection Feature
• Capable to Operate in Positive and Negative Branch
• Small Size
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EVAL BOARD USER’S MANUAL
Figure 1. Evaluation Board Photo
Table 1.
SMPS Type Supply Voltage Reverse Voltage Effective Resistance
Flyback, QR 3.5 − 35 V 150 V
© Semiconductor Components Industries, LLC, 2017
November, 2017 − Rev. 0
10 mW
1 Publication Order Number:
EVBUM2520/D
EVBUM2520/D
CONNECTION DIAGRAM
a) b)
Figure 2. Possible Connections into Circuit
The evaluation board can be connected in circuit where
the rectification diode is in the positive or negative branch.
When connection to a positive branch is used, it is necessary
to use an external power supply (or auxiliary winding with
rectification) to provide power to the evaluation board. VCC
should be referenced to A1 or A2 points.
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EVBUM2520/D
EVALUATION BOARD SCHEMATIC
Figure 3. Schematic of the NCP4306
The evaluation board was designed to support a minimal
external component count implementation. C1 is
decoupling capacitor that should be placed as close as
possible to the VCC and GND pins. Resistors RMIN_TON
and RMIN_TOFF are used to set the protection interval
when the synchronous MOSFET is turned on and off. It may
be needed to adjust them according to used SMPS. RLLD
sets light load detection time and CLLD is optional for LLD
voltage decoupling. Components CSNB, RSNB1 and
RSNB2 form a snubber circuit.
Transistor M1 is 150 V V
capable with R
DS
DSON
of
9.3 mW typ@10 V.
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3
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