PRELIMINARY
Nov 3, 2010
IR1145SPBF
FIXED 66kHz FREQUENCY, µPFC ONE CYCLE CONTROL PFC
IC WITH BROWN-OUT PROTECTION
Features
• PFC IC with IR proprietary “One Cycle Control”
• Continuous conduction mode boost type PFC
• Fixed 66kHz switching frequency
• Average current mode control
• Input line sensed brownout protection
• Output overvoltage protection
• Open loop protection
• Cycle by cycle peak current limit
• VCC under voltage lockout
• Programmable soft start
• Micropower startup
• User initiated micropower “Sleep Mode”
• 750mA peak gate drive
• Latch immunity and ESD protection
Description
IR1145 power factor correction IC, based on IR proprietary "One Cycle
Control" (OCC) technique, provides for high PF and excellent DC Bus
regulation while enabling drastic reduction in component count, PCB
area and design time as compared to traditional solutions. The IC is
designed to operate in 85-264VAC universal input, continuous
conduction mode Boost PFC at fixed 66kHz switching frequency.
IR1145 features include input-line sensed brown-out protection,
overvoltage protection, cycle by cycle peak current limit, open loop
protection, V
CC
UVLO, soft-start and micropower startup current of less
than 150µA. In addition, for standby power requirements, the IC can be
driven into a micropower sleep mode by pulling the OVP/EN pin low
where the current consumption is less than 150uA. The IR1145 is
available in SO-8 packages.
Package
IR1145 Application Diagram
ACIN1
-
+
VCC
VOUT
ACIN2
1
2
3
4
COM
COMP
ISNS
GATE
VCC
VFB
8
7
6
5
+
BOP OVP/EN
IR1145
RTN
www.irf.com
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