IRAC1166-100W International Rectifier, IRAC1166-100W Datasheet - Page 8

• 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: -

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
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
on the amount of residual current, V
once again the turn on threshold: for this reason V
www.irf.com
V
V
V
I
V
I
PRIM
I
I
PRIM
SEC
SEC
PRIM
PRIM
SEC
SEC
Primary and secondary currents and
Primary and secondary currents and
T1
T1
voltages for CrCM mode
voltages for DCM mode
DS
DS
T2
will cross the turn-off threshold V
voltage to jump negative. Depending
T2
T3
DS
may trigger
time
time
time
TH1
time
TH2
.
is blanked for a certain amount of time (T
V
The blanking time is internally set. As soon as V
crosses the positive threshold V
time is terminated and the IC is ready for next
conduction cycle.
CCM Turn-off phase
In CCM mode the turn off transition is much steeper
and dI/dt involved is much higher. The turn on phase
is identical to DCM or CrCM and therefore won’t be
repeated here.
During the SR FET conduction phase the current will
decay linearly, and so will VDS on the SR FET.
Once the primary switch will start to turn back on, the
SR FET current will rapidly decrease crossing V
and turning the gate off.
The turn off speed is critical to avoid cross conduction
on the primary side and reduce switching losses.
also in this case a blanking period will be applied, but
given the very fast nature of this transition, it will be
reset as soon as V
TH1
V
V
I
I
PRIM
SEC
SEC
PRIM
Primary and secondary currents and
has been triggered.
T1
voltages for CCM mode
T2
DS
crosses V
TH3
TH3
IR1166S
.
also the blanking
BLANK
) after
time
time
TH1
DS
8