IRAC1166-100W International Rectifier, IRAC1166-100W Datasheet - Page 7

• Manufacturer Part Number: IRAC1166-100W
• Description: BOARD DEMO 100W FOR IR1166
• Manufacturer: International Rectifier

Specifications of IRAC1166-100W

• Main Purpose: AC/DC, Secondary Side
• Outputs And Type: 1, Isolated
• Power - Output: 100W
• Voltage - Output: 16V
• Current - Output: 6.25A
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: Flyback
• Board Type: Fully Populated
• Utilized Ic / Part: IR1166S, IRF7853
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -

STATES OF OPERATION
UVLO/Sleep Mode
The IC remains in the UVLO condition until the voltage
on the VCC pin exceeds the VCC turn on threshold
voltage, V
During the time the IC remains in the UVLO state, the
gate drive circuit is inactive and the IC draws a
quiescent current of I
accessible from any other state of operation whenever
the IC supply voltage condition of VCC < V
occurs.
The sleep mode is initiated by pulling the EN pin below
2.5V (typ). In this mode the IC is essentially shut down
and draws a very low quiescent supply current.
Normal Mode
The IC enters in normal operating mode once the
UVLO voltage has been exceeded. At this point the
gate driver is operating and the IC will draw a
maximum of I
www.irf.com
CC ON
CC
.
from the supply voltage source.
CC START
. The UVLO mode is
CC UVLO
GENERAL DESCRIPTION
The IR1166 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
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.
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
correspond 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
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
At that point the IR1166 will drive the gate of MOSFET
on which will in turn cause the conduction voltage V
to drop down. This drop is usually accompained 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
V
TH2
Input comparator thresholds
V
TH1
V
Gate
DS
voltage across it. The body
IR1166S
V
TH3
TH2
DSon
.
V
DS
DS
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