Rectification Controller. NCP4302 Datasheet

NCP4302 Controller. Datasheet pdf. Equivalent

Part NCP4302
Description Synchronous Rectification Controller
Feature NCP4302 Secondary Side Synchronous Flyback Controller The NCP4302 is a full featured controller and.
Manufacture ON Semiconductor
Datasheet
Download NCP4302 Datasheet




NCP4302
NCP4302
Secondary Side
Synchronous Flyback
Controller
The NCP4302 is a full featured controller and driver that provide all
the control and protection functions necessary for implementing a
synchronous rectifier operation in a flyback converter. With the use of
the NCP4302, the space conscious flyback applications such as
Adaptors, chargers, set top boxes can achieve significant efficiency
improvements at minimal extra cost. In addition to the synchronous
rectifier control, the IC incorporates an accurate TL431 type shunt
regulator, current monitoring circuit and optocoupler driver to provide
a single IC secondary solution. The NCP4302 works with any type of
flyback topology (continuous mode, Quasiresonant mode or
discontinuous mode) – providing a high level of versatility.
Features
Selfcontained Control of Synchronous Rectifier in CCM, DCM, and
QR Flyback Applications
Interface to External Signal for CCM Mode
True Secondary Zero Current Detection
High Gate Drive Currents (2.5 A Source/Sink)
High Voltage Operation
Current Sense Flexibility (MOSFET RDS(on) OR CS Resistor)
Accurate Low Voltage Reference
NCP4302A 2.55 V, 1%
NCP4302B 1.275 V, 1%
Programmable Independent Secondary Side ton and toff Delays
Maximum Frequency of Operation up to 250 kHz
These are PbFree Devices
Typical Applications
Notebook Adapters
LCD TV Adapters
Consumer Appliances such as DVD, VCR
Power Over Ethernet Applications (IP phones, Wireless Access
Points)
Battery Chargers
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8
1
x
A
L
Y
W
G
SO8
D SUFFIX
CASE 751
MARKING
DIAGRAM
8
4302x
ALYW
G
1
= Reference Voltage (A or B)
= Assembly Location
= Wafer Lot
= Year
= Work Week
= PbFree Package
PIN CONFIGURATION
SYNC/CS 1
TRIG 2
CATH 3
VREF 4
8 VCC
7 DRV
6 GND
5 DLYADJ
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP4302ADR2G SO8 2500/Tape & Reel
(PbFree)
NCP4302BDR2G SO8 2500/Tape & Reel
(PbFree)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2015
May, 2015 Rev. 4
1
Publication Order Number:
NCP4302/D



NCP4302
NCP4302
PIN DESCRIPTION
Pin
Number
Symbol
1 SYNC/CS
2 TRIG
3 CATH
4 VREF
5 DLYADJ
6 GND
7 DRV
8 VCC
Description
Connected to the flyback winding. The current on this pin is sensed and used to turn on the Synchronous
Rectification MOSFET (SRFET). This pin is also used to sense the zero crossing of the MOSFET current
either using the RDS(on) of the SRFET or using an external current sense resistor connected between
drain of the SRFET and the flyback winding.
Input pin for direct turnoff of the MOSFET. Typically connected to a signal from primary controller (for
CCM mode) or a signal derived from the transformer (for QR mode). Has very short propagation delay to
output (<50 ns).
Feedback compensation pin for the TL431 shunt regulator. Has the capability to sinking 10 ma of opto
current.
Output voltage feedback through resistive divider connected to this pin. Regulated at 1.28 V (option B) or
2.55 V (option A).
A resistive divider between the power supply output and ground with the center point tied to the DLYADJ
input pin allows for independent adjustment of the minimum ton and toff delay time. The maximum extern-
al capacitance from this pin to ground is 25 pF.
Return pin for the controller – connected to the output return.
Drive output for external MOSFET – 2.5 A peak drive capability, internally clamped to 13.5 V (Maximum)
Bias voltage for the controller. Maximum voltage is 28 V.
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Input
Current
VCC 0.3 to 28
V
ICC 100 mA
Drive Voltage
Current
VDRV
0.3 to 18
100
V
mA
Drive Current
Source
Sink
IDRV
2.5
2.5
Apk
Analog and Logic Inputs
Maximum Voltage
Current
TRIG, VREF,
DLYADJ
SYNC/CS
0.3 to 10
100
10 to 95
100
V
mA
V
mA
Operating Junction Temperature Range
TJ 40 to 125 °C
Maximum Junction Temperature
TJmax
150
°C
Storage Temperature Range
TSmax
65 to 150
°C
Lead Temperature (Soldering, 10 s)
TLmax
300
°C
Reference input Current, continuous
IREF
0.05 to 10
mA
Total Power Dissipation
PD 225 mW
Thermal Resistance JunctiontoAmbient
qJA 178 °C/W
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. This device series contains ESD protection and exceeds the following tests:
Pin 18: Human Body Model 2000 V per JEDEC Standard JESD22, Method A114E.
Machine Model (MM) 200 V per JEDEC Standard JESD22, Method A115A.
2. This device contains Latchup protection and exceeds ±100 ma per JEDEC Standard JESD78
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