ir1155s International Rectifier Corp., ir1155s Datasheet - Page 8

• Manufacturer Part Number: ir1155s
• Description: Programmable Frequency, One Cycle Control Pfc Ic
• Manufacturer: International Rectifier Corp.

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Block Diagram
OVP
COMP
VFB
VOVP
Overvoltage
Comparator
(Stand-By Mode)
Comparator
Open Loop
VBIAS
VOLP
VSLEEP
(SLEEP MODE)
V BIAS
Comparator
V
Enable
REF
V BIAS
STNDBY
VBIAS
OVP
250mV
VCOMP Discharge
Threshold
Comparator
UVLO/SLEEP
SLEEP
V
m
V
COMP
Discharge
V BIAS
ISNS
V BIAS
S1
R
RAMP
Q
Q
RESET
VISNS(PK)
+
Overcurrent
Comparator
Peak
-
V BIAS
VSUMMER
VCOMP
0
8
OCP
V BIAS
OVP
PWM OFF
RESET
FREQ
GATE OFF
BLANK
Pulse at Ton
Blanking
OSC
OSCILLATOR
V BIAS
MAX
DUTY
VOLP = 19%V
DUTY CYCLE
VOUV = 50% V
VOVP = 106% V
LIMIT
MAX
80% V
VSLEEP
250mV
SET
V
REF
REF
REF
REF
© 2011 International Rectifier
REF
R1
S
VCC OK
Q
IR1155S
GATE OFF
SLEEP
(POWER
OFF)
Internal Rail
Reference
UVLO
Precision
&
V BIAS
VCC
GATE
COM
VCC