IR1168 SmartRectifier™ IC - International Rectifier

AC-DC SYSTEMS
THE POWER MANAGEMENT LEADER
IR1168 SmartRectifier IC
Features
• 200V proprietary IC technology
• Maximum 500kHz switching frequency
• Anti-bounce logic and UVLO protection
• 4A peak turn-off gate drive current
• Micropower start-up and ultra low
quiescent current
• 10.7V gate drive clamp
70ns turn-off propagation delay
• Wide V CC
operating range
• Direct sensing for both Synchronous Rectifiers
• Minimal component count
• Simple design
• Lead-free
Advantages
• Decides turn-on and turn-off based on
secondary signals independently from primary
side for ease of implementation.
• Supports burst mode operation.
• Decides turn-on and turn-off based on MOSFET
drain sensing voltage to allow higher efficiency
than sensing current via transformer.
• Requires only a few passive external components.
Increase System Efficiency 1.5%; Reduce Rectifier Device
Temperature by 25°C; Shrink PCB Size by Two Thirds
The IR1168 200V dual smart secondary-side rectifier driver IC is designed to drive two
N-Channel power MOSFETs used as synchronous rectifiers (SR) in resonant halfbridge
topologies. In contrast to traditional current transformer SR methods, the IR1168
accurately determines turn-on and turn-off based on MOSFET drain sensing voltage in
close proximity to zero current transition, eliminating the need for additional components
to simplify design.
While synchronous rectification provides significant energy savings compared to diodebased
designs, traditional SR methods are complex and require a high component count.
Using only two gate resistors and a supply capacitor, the IR1168 delivers a lower system
temperature and increased power density for even greater efficiency and reliability than
existing SR methods while simplifying design and drastically reducing component count
to shrink PCB size.
SmartRectifier and DirectFET ® are registered trademarks of
International Rectifier Corp.
Co-designed with IR’s DirectFET ® MOSFETs, which feature IR’s latest Trench silicon and
packaging technology, the IR1168-based solution delivers an efficiency improvement of
1.5 % for a standard 240 W LCD TV SMPS and a reduction of rectifier device temperature
of 25 °C while shrinking board size by two thirds.
For more information, call 310.252-7105 or visit us at www.irf.com
10305FS

IR1168 SmartRectifier IC, continued
Smarter, Cooler, Smaller
240W LCD TV SMPS
12V Rail Rectifier 2
24V Rail Rectifier 2
SMPS efficiency: + 1.5%
Rectifier temperature: -25°C
Input: 240 VRMS, 50/60Hz; Outputs: 24V/7.5A, 12V/3A, 5V/4A , 5Vsb/1A
SmartRectifier ICs
Part Number Package Voltage
Sw. Freq. Max.
(kHz)
V cc
min V cc
max I out
VGate Clamp (V)
IR1168SPbF SO-8 200 V 500 8.6 V 18 V + 1 A/ -4 A 10.7 V
IR1168STRPbF SO-8 200 V 500 8.6 V 18 V + 1 A/ -4 A 10.7 V
DirectFET ® MOSFETs
R
Part Number Package V BRDSS
(V)
DS(on)
Max 10V
(mOhms)
Qg Typ (nC)
Qgd Typ (nC)
IRF6648 DirectFET MN 60 7.0 36.0 14.0
IRF6646 DirectFET MN 80 9.5 36.0 12.0
IRF6668 DirectFET MZ 80 15.0 22.0 7.8
IRF6644 DirectFET MN 100 13.0 35.0 11.5
IRF6662 DirectFET MZ 100 22.0 22.0 6.8
IRF6645 DirectFET SJ 100 35.0 14.0 4.8
IRF6655 DirectFET SH 100 62.0 8.7 2.8
IRF6643 DirectFET MZ 150 34.5 39.0 11.0
IRF6641 DirectFET MZ 200 59.9 34.0 9.5
STANDARD MOSFETs
Part Number V BRDSS
(V) R DS(on)
Package
IRFB3206PbF 60V 3.0mOhm TO-220
IRFB3306PbF 60V 4.2mOhm TO-220
IRF7855PbF 60V 9.4mOhm SO-8
IRFB3307PbF 75V 6.3mOhm TO-220
IRFB3507PbF 75V 8.8mOhm TO-220
IRF7854PbF 80V 13.4mOhm SO-8
IRFB4110PbF 100V 6.3mOhm TO-220
IRFB4310PbF 100V 7mOhm TO-220
IRFB4410PbF 100V 10mOhm TO-220
IRFB4610PbF 100V 14mOhm TO-220
IRF7853PbF 100V 18mOhm SO-8
IRFB4227PbF 200V 26mOhm TO-220
For more information, call 310.252-7105 or visit us at www.irf.com
10305FS