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Rectifier Driver. NCP81178 Datasheet

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Rectifier Driver. NCP81178 Datasheet
















NCP81178 Driver. Datasheet pdf. Equivalent













Part

NCP81178

Description

Secondary Synchronous Rectifier Driver



Feature


NCP81178 Secondary Synchronous Rectifier Driver for Forward Converters The NCP8 1178 is a secondary−side synchronous rectifier driver designed for isolated power converters, especially actively c lamped forward and fly−back, and asym metric half−bridge converters. The NC P81178 drives two N−channel MOSFETs o n the secondary side in a complementary manner. It accepts a PWM .
Manufacture

ON Semiconductor

Datasheet
Download NCP81178 Datasheet


ON Semiconductor NCP81178

NCP81178; input signal derived from the secondary winding or an auxiliary winding on the main power transformer. It can also tak e a PWM signal from the primary−side controller through a pulse transformer or other isolators. Features • N−Ch annel Synchronous Rectifier MOSFET Driv er • PWM Input Derived from a Winding on the Main Transformer or Directly fr om a Pulse Transformer • I.


ON Semiconductor NCP81178

nternally Generated PWM Threshold Voltag e that can be Programmed Externally • Pre−bias Startup Capability • Prim ary Shutdown Detection • Frequency De tection Window • Wide VIN/VCC Range: 4.5 V to 14 V • 6 V/150 mA LDO for VC C Supply • 4.5 A/3.8 A Sink and 3 A S ource Drive Capability • 12 ns PWM Pr opagation Time • 12 ns Rise Time/10 n s Fall Time at CL = 4700 pF @ VCC = .


ON Semiconductor NCP81178

6 V • VCC under−voltage lockout • Will support converter output voltages as high as 28 V • Pb−Free 10−pin DFN 3 mm x 3 mm Package • This is a P b−Free Device Typical Applications High−Efficiency Isolated DC/DC Powe r Supplies • Server Power, 48 V Telec om and Data−com Applications www.ons emi.com 1 DFN10 MN SUFFIX CASE 506AA M ARKING DIAGRAM 81178 ALYWG G A = Assembly .




Part

NCP81178

Description

Secondary Synchronous Rectifier Driver



Feature


NCP81178 Secondary Synchronous Rectifier Driver for Forward Converters The NCP8 1178 is a secondary−side synchronous rectifier driver designed for isolated power converters, especially actively c lamped forward and fly−back, and asym metric half−bridge converters. The NC P81178 drives two N−channel MOSFETs o n the secondary side in a complementary manner. It accepts a PWM .
Manufacture

ON Semiconductor

Datasheet
Download NCP81178 Datasheet




 NCP81178
NCP81178
Secondary Synchronous
Rectifier Driver for Forward
Converters
The NCP81178 is a secondary−side synchronous rectifier driver
designed for isolated power converters, especially actively clamped
forward and fly−back, and asymmetric half−bridge converters. The
NCP81178 drives two N−channel MOSFETs on the secondary side in
a complementary manner. It accepts a PWM input signal derived from
the secondary winding or an auxiliary winding on the main power
transformer. It can also take a PWM signal from the primary−side
controller through a pulse transformer or other isolators.
Features
N−Channel Synchronous Rectifier MOSFET Driver
PWM Input Derived from a Winding on the Main Transformer or
Directly from a Pulse Transformer
Internally Generated PWM Threshold Voltage that can be
Programmed Externally
Pre−bias Startup Capability
Primary Shutdown Detection
Frequency Detection Window
Wide VIN/VCC Range: 4.5 V to 14 V
6 V/150 mA LDO for VCC Supply
4.5 A/3.8 A Sink and 3 A Source Drive Capability
12 ns PWM Propagation Time
12 ns Rise Time/10 ns Fall Time at CL = 4700 pF @ VCC = 6 V
VCC under−voltage lockout
Will support converter output voltages as high as 28 V
Pb−Free 10−pin DFN 3 mm x 3 mm Package
This is a Pb−Free Device
Typical Applications
High−Efficiency Isolated DC/DC Power Supplies
Server Power, 48 V Telecom and Data−com Applications
www.onsemi.com
1
DFN10
MN SUFFIX
CASE 506AA
MARKING DIAGRAM
81178
ALYWG
G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
SDDET 1
RRAMP 2
PBSS 3
PWMTH 4
PWM 5
Flag 11
GND
(Top View)
10 VIN
9 VCC
8 GFW
7 DL
6 GFR
© Semiconductor Components Industries, LLC, 2016
December, 2016 − Rev. 4
ORDERING INFORMATION
Device
NCP81178MNTXG
Package
DFN10
(Pb−Free)
Shipping
3000 / Tape &
Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
1
Publication Order Number:
NCP81178/D




 NCP81178
NCP81178
VIN
5V – 14V
16.5 kW
470 pF
SDDET
VIN
RRAMP
10 nF
CPBSS
RRAMP
VCC
PWMTH
GFW
PBSS
DL
PWM
GND
GFR
1 mF
1 mF
4.02 kW
1 nF 300 W
15 pF
RPBSS 45.3 kW
QFR
QFW
Figure 1. Typical Application Circuit − Secondary Synchronous Rectifier Driver
VOUT
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2




 NCP81178
NCP81178
VIN 10
VCC 9
PWM 5
LDO
Regulator
(6 V )
VCC UVLO
Comparator
4.3 V
VCC UVLO
Hysteresis 400 mV
SDDET fault
Frequency fault
1.25 V
PWMTH 4
Fault
PWM_D
Minimum Off0
Timers, Non−
Overlap and
Driver Logic
Slow Ramp
3V
PBSS < 3 V
Shutdown Detection
Comparator
PBSS 3
RRAMP 2
Fault
SLOW _ RAMP
Generator
FAST _ RAMP
Generator
1 .25 V
PBSS Onset
Threshold
Comparator
Prebias Soft−Start
Comparator
SDDET
fault
PWM _ D
VCC _ UVLO
Slow Ramp
Frequency
Detection
Frequency
fault
PWM_D
VCC_UVLO
PBSS< 3 V
SLOW_RAMP
PWM _ D
1 .25 V
SDDET
Control
DL Pulldown
Control
Flag 11
GND
Figure 2. Simplified Block Diagram
6 GFR
8 GFW
1 SDDET
7 DL
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3




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