IR1150PBF International Rectifier, IR1150PBF Datasheet - Page 7

• Manufacturer Part Number: IR1150PBF
• Description: IC PFC CONTROLLER CCM 8-DIP
• Manufacturer: International Rectifier

Specifications of IR1150PBF

• Mode: Continuous Conduction (CCM)
• Frequency - Switching: 200kHz
• Current - Startup: 175µA
• Voltage - Supply: 15 V ~ 20 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

General Description
The µPFC IR1150 is intended for boost converters for
power factor correction operating at a fixed frequency in
continuous conduction mode. The IC operates with two
loops; an inner current loop and an outer voltage loop.
The inner current loop is fast, reliable and does not
require sensing of the input voltage in order to create a
current reference.
This inner current loop sustains the sinusoidal profile of
the average input current based on the dependency of
the pulse width modulator duty cycle on the input line
voltage in order to determine the analogous input line
current. Thus, the current loop uses the embedded
input voltage signal to control the average input current
to follow the input voltage.
The IR1150 enables excellent THD performance. In
light load conditions, a small distortion occurs at zero-
crossing due to the finite boost inductance but this is
negligible and well within EN61000-3-2 Class D
specifications.
The outer voltage loop controls the DC bus voltage.
This voltage is fed into the voltage error amplifier to
control the slope of the integrator ramp and sets the
amplitude of the average input current.
The two loops combine to control the amplitude, phase
and shape of the input current, with respect to the input
voltage, giving near-unity power factor.
The IC is designed for robust operation and provides
protection from system level over current, over voltage,
under voltage, and brownout conditions.
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IC Supply
The UVLO circuit monitors the VCC pin and maintains the
gate drive signal inactive until the VCC pin voltage
reaches the UVLO turn on threshold, (V
the VCC voltage exceeds this threshold, provided that the
V
will begin switching (under Soft Start) and increase the
pulse width to its maximum value as demanded by the
output voltage error amplifier. If the voltage on the VCC
pin falls below the UVLO turn off threshold, (V
IC turns off, gate drive is terminated, and the turn on
threshold must again be exceeded in order to re-start the
process and move into Soft Start mode
Soft Start
Soft Start controls the rate of rise of the output voltage
error amplifier in order to obtain a linear control of the
increasing duty cycle as a function of time. The Soft Start
time is controlled by voltage error amplifier compensation
components selected, and is user programmable based
on desired loop crossover frequency.
Frequency Select
The switching frequency of the IC is programmable by an
external
incorporates min/max restrictions such that the minimum
and maximum operating frequency fall within the range of
50-200kHz.
Gate Drive
The gate drive is a totem pole driver with 1.5A capability.
If higher currents are required, additional external drivers
can be used.
FB
IR1150(S)/IR1150I(S)(PbF)
pin voltage is greater than 20%VREF, the gate drive
resistor
at
the
FREQ
.
pin.
CC ON
). As soon as
The
CC UVLO
design
), the
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