IR11672AS
ADVANCED SMARTRECTIFIER
TM
CONTROL IC
Features
Secondary side high speed SR controller
DCM, CrCM flyback and Resonant half-bridge
topologies
200 V proprietary IC technology
Max 500 KHz switching frequency
Anti-bounce logic and UVLO protection
7 A peak turn off drive current
Micropower start-up & ultra low quiescent current
10.7 V gate drive clamp
50ns turn-off propagation delay
Vcc range from 11.3 V to 20 V
Direct sensing of MOSFET drain voltage
Enable function synchronized with MOSFET VDS
transition
Cycle by Cycle MOT Check Circuit prevents
multiple false trigger GATE pulses
Lead-free
Compatible with 0.3 W Standby, Energy Star,
CECP, etc.
Product Summary
Topology
VD
V
OUT
I
o+
& I
o-
(typ.)
Turn on Propagation
Delay (typ.)
Turn off Propagation
Delay (typ.)
Flyback,
Resonant Half-bridge
200 V
10.7 V
+2 A & -7 A
60 ns
50 ns
Package Options
8-Lead SOIC
Typical Applications
LCD & PDP TV, Telecom SMPS,
adapters, ATX SMPS, Server SMPS
AC-DC
Ordering Information
Standard Pack
Base Part Number
Package Type
Form
IR11672AS
SOIC8N
Tube/Bulk
Tape and Reel
Quantity
95
2500
IR11672ASPBF
IR11672ASTRPBF
Complete Part Number
1
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© 2013 International Rectifier
Nov 6, 2013
IR11672AS
Typical Connection Diagram
Vin
Rs
XFM
Cs
1
Ci
2
3
RMOT
4
Rdc
U1
VCC
OVT
MOT
EN
VGATE
GND
VS
VD
8
7
6
5
Rg
Cdc
Co
IR11672AS
IR11671
Rtn
Q1
2
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© 2013 International Rectifier
LOAD
Nov 6, 2013
IR11672AS
Table of Contents
Ordering Information
Description
Absolute Maximum Ratings
Electrical Characteristics
Functional Block Diagram
Input / Output Pin Equivalent Circuit Diagram
Lead Definitions
Lead Assignments
Detailed Pin Description
Application Information and Additional Details
Package Details
Tape and Reel Details
Part Marking Information
Qualification Information
Page
1
4
5
6
8
9
10
10
11
12
23
24
25
26
3
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© 2013 International Rectifier
Nov 6, 2013
IR11672AS
Description
IR11672A is a smart secondary-side driver IC designed to drive N-Channel power MOSFETs used as
synchronous rectifiers in isolated Flyback and resonant half-bridge converters. The IC can control one or more
paralleled N-MOSFETs to emulate the behavior of Schottky diode rectifiers. The drain to source voltage is sensed
differentially to determine the polarity of the current and turn the power switch on and off in proximity of the zero
current transition. The cycle-by-cycle MOT protection circuit can automatically detect no load condition and turn off
gate driver output to avoid negative current flowing through the MOSFETs. Ruggedness and noise immunity are
accomplished using an advanced blanking scheme and double-pulse suppression which allow reliable operation in
all operating modes.
4
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© 2013 International Rectifier
Nov 6, 2013
IR11672AS
Absolute Maximum Ratings
Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage
parameters are absolute voltages referenced to COM, all currents are defined positive into any lead. The thermal
resistance and power dissipation ratings are measured under board mounted and still air conditions.
Parameters
Supply Voltage
Enable Voltage
Cont. Drain Sense Voltage
Pulse Drain Sense Voltage
Source Sense Voltage
Gate Voltage
Operating Junction Temperature
Storage Temperature
Thermal Resistance
Package Power Dissipation
Switching Frequency
Symbol
V
CC
V
EN
V
D
V
D
V
S
V
GATE
T
J
T
S
R
P
D
fsw
Min.
-0.3
-0.3
-3
-5
-3
-0.3
-40
-55
Max.
20
20
200
200
20
20
150
150
128
970
500
Units
Remarks
V
V
CC
=20V, Gate off
°C
°C/W
mW
kHz
SOIC-8
SOIC-8, T
AMB
=25°C
Recommended Operating Conditions
For proper operation the device should be used within the recommended conditions.
Symbol
V
CC
V
D
T
J
Fsw
Definition
Supply voltage
Drain Sense Voltage
Junction Temperature
Switching Frequency
Min.
11.4
-3
-25
---
Max.
18
200
125
500
Units
V
°C
kHz
Recommended Component Values
Symbol
R
MOT
Component
MOT pin resistor value
Min.
5
Max.
75
Units
k
5
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© 2013 International Rectifier
Nov 6, 2013
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