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IR1167S Schematic ( PDF Datasheet ) - International Rectifier

Teilenummer IR1167S
Beschreibung SMARTRECTIFIER CONTROL IC
Hersteller International Rectifier
Logo International Rectifier Logo 




Gesamt 25 Seiten
IR1167S Datasheet, Funktion
IR1167(A,B)S
SMARTRECTIFIERTM CONTROL IC
Features
Secondary side high speed SR controller
DCM, CrCM and CCM flyback 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 / 14.5 V gate drive clamp
50ns turn-off propagation delay
Vcc range from 11.3 V to 20 V
Direct sensing of MOSFET drain voltage
Minimal component count
Simple design
Lead-free
Compatible with 1 W Standby, Energy Star, CECP, etc.
Product Summary
Topology
VD
VOUT
IR1167A
IR1167B
Io+ & I o- (typ.)
Turn on Propagation
Delay (typ.)
Turn off Propagation
Delay (typ.)
Package Options
Flyback
200 V
10.7 V
14.5 V
+2 A / -7 A
60 ns
40 ns
Typical Applications
LCD & PDP TV, Telecom SMPS, AC-DC
adapters, ATX SMPS, Server SMPS
8-Lead SOIC
Ordering Information
Base Part Number
IR1167AS
IR1167BS
Package Type
SOIC8N
Standard Pack
Form
Quantity
Tape and Reel
2500
Tape and Reel
2500
Complete Part Number
IR1167ASTRPBF
IR1167BSTRPBF
1 www.irf.com © 2013 International Rectifier
Nov 6, 2013






IR1167S Datasheet, Funktion
IR1167(A,B)S
Electrical Characteristics
The electrical characteristics involve the spread of values guaranteed within the specified supply voltage and
junction temperature range TJ from 25° C to 125°C. Typical values represent the median values, which are
related to 25°C. If not otherwise stated, a supply voltage of VCC =15V is assumed for test condition.
Supply Section
Parameters
Supply Voltage Operating
Range
VCC Turn On Threshold
VCC Turn Off Threshold
(Under Voltage Lock Out)
VCC Turn On/Off Hysteresis
IR1167A
Operating Current
IR1167B
Quiescent Current
Start-up Current
Sleep Current
Enable Voltage High
Enable Voltage Low
Enable Pull-up Resistance
Symbol
VCC
VCC ON
VCC UVLO
VCC HYST
ICC
IQCC
ICC START
ISLEEP
VENHI
VENLO
REN
Min.
12
9.8
8.4
1.4
2.15
1.2
Typ.
10.5
9
1.55
8.5
50
10.3
66
1.8
100
150
2.75
1.6
1.5
Max.
18
11.3
9.7
1.7
10
65
12
80
2.2
200
200
3.2
2
Units
GBD
V
Remarks
CLOAD=1nF, fsw=400kHz
CLOAD=10nF, fsw=400kHz
mA CLOAD=1nF, fsw=400kHz
CLOAD=10nF, fsw=400kHz
µA
VCC=VCC ON - 0.1V
VEN=0V, VCC =15V
V
MGBD
Comparator Section
Parameters
Turn-off Threshold
Turn-on Threshold
Hysteresis
Input Bias Current
Comparator Input Offset
Input CM Voltage Range
Symbol
VTH1
VTH2
VHYST
IIBIAS1
IIBIAS2
VOFFSET
VCM
Min.
-7
-15
-23
-150
-0.15
Typ.
-3.5
-10.5
-19
55
1
30
Max.
0
-7
-15
-50
7.5
100
2
2
Units
mV
Remarks
OVT = 0V, VS=0V
OVT floating, VS=0V
OVT = VCC, VS=0V
µA
VD = -50mV
VD = 200V
mV GBD
V
One-Shot Section
Parameters
Blanking pulse duration
Reset Threshold
Hysteresis
Symbol
tBLANK
VTH3
VHYST3
Min.
9
Typ.
15
2.5
5.4
40
Max.
25
Units
µs
V
mV
Remarks
VCC=10V - GBD
VCC=20V - GBD
VCC=10V - GBD
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Nov 6, 2013

6 Page









IR1167S pdf, datenblatt
IR1167(A,B)S
General Description
The IR1167 Smart Rectifier IC can emulate the operation of diode rectifier by properly driving a Synchronous Rectifier (SR)
MOSFET. The direction of the rectified current is sensed by the input comparator using the power MOSFET RDSon as a shunt
resistance and the GATE pin of the MOSFET is driven accordingly. Internal blanking logic is used to prevent spurious
transitions and guarantee operation in continuous (CCM), discountinuous (DCM) and critical (CrCM) conduction mode.
VGate
VTH2
VTH1
VTH3
VDS
Figure 1: Input comparator thresholds
Flyback Application
The modes of operation for a Flyback circuit differ mainly for the turn-off phase of the SR switch, while the turn-on phase of the
secondary switch (which corresponds to the turn off of the primary side switch) is identical.
Turn-on phase
When the conduction phase of the SR FET is initiated, current will start flowing through its body diode, generating a negative
VDS voltage across it. The body diode has generally a much higher voltage drop than the one caused by the MOSFET on
resistance and therefore will trigger the turn-on threshold VTH2.
At that point the IR1167 will drive the gate of MOSFET on which will in turn cause the conduction voltage VDS to drop down.
This drop is usually accompanied by some amount of ringing, that can trigger the input comparator to turn off; hence, a
Minimum On Time (MOT) blanking period is used that will maintain the power MOSFET on for a minimum amount of time.
The programmed MOT will limit also the minimum duty cycle of the SR MOSFET and, as a consequence, the max duty cycle
of the primary side switch.
DCM/CrCM Turn-off phase
Once the SR MOSFET has been turned on, it will remain on until the rectified current will decay to the level where VDS will
cross the turn-off threshold VTH1. This will happen differently depending on the mode of operation.
In DCM the current will cross the threshold with a relatively low dI/dt. Once the threshold is crossed, the current will start
flowing again through the body diode, causing the VDS voltage to jump negative. Depending on the amount of residual current,
VDS may trigger once again the turn on threshold: for this reason VTH2 is blanked for a certain amount of time (TBLANK) after
VTH1 has been triggered.
The blanking time is internally set. As soon as VDS crosses the positive threshold VTH3 also the blanking time is terminated and
the IC is ready for next conduction cycle.
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