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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 R DSon 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.
V Gate
V DS
V TH2
V TH1
V TH3
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
V DS 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 V TH2 .
At that point the IR1167 will drive the gate of MOSFET on which will in turn cause the conduction voltage V DS 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 V DS will
cross the turn-off threshold V TH1 . 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 V DS voltage to jump negative. Depending on the amount of residual current,
V DS may trigger once again the turn on threshold: for this reason V TH2 is blanked for a certain amount of time (T BLANK ) after
V TH1 has been triggered.
The blanking time is internally set. As soon as V DS crosses the positive threshold V TH3 also the blanking time is terminated and
the IC is ready for next conduction cycle.
12
www.irf.com
? 2013 International Rectifier
Nov 6, 2013
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