AN8038S Panasonic Semiconductor, AN8038S Datasheet - Page 6

• Manufacturer Part Number: AN8038S
• Description: AC-DC switching power supply control IC with RCC local resonance circuit for improved conformance with energy conservation laws
• Manufacturer: Panasonic Semiconductor

AN8038, AN8038S
6
Pin No.
Terminal Equivalent Circuits (continued)
2
3
4
5
6
V
V
REF
V
REF
V
REF
V
REF
Comp.
FB
Comp.
Comp.
20 k
Equivalent Circuit
1
CF
V
GND
FB
CLM
6
CF
3
5
17.5 k
17.5 k
IFB
4
1 k
5
I
OFF
RSTB
2
I
ON
RSTB:
Adjusts the light-load detection level that deter-
mines the time when the IC switches from RCC
to discontinuous operation. When the voltage
which is I-V conversion of current feedback sig-
nal goes up higher than this pin, operating fre-
quency is reduced.
external pull-down resistor.
CF:
Connection for the capacitor that determines the
on- and off-periods of the IC output (Out).
The on- and off-periods are corrected by I
which is proportional to the flowing out cur-
rent at the TR pin, and I
to the current at IFB pin.
IFB:
Connection for the photocoupler used for the
power supply output error-voltage feedback.
This input can decrease the photocoupler dark
current by about 250 A.
CLM:
Input to the pulse-by-pulse overcurrent protec-
tion circuit. Normally, we recommend adding
an external filter for this input.
GND:
An arbitrary level can be set by inserting an
IC ground.
Description
OFF
which corresponds
Voltage Regulators
ON
I/O
I
I