an8021l Panasonic Corporation of North America, an8021l Datasheet - Page 5

• Manufacturer Part Number: an8021l
• Description: Ac-dc Switching Power Supply Control Ic
• Manufacturer: Panasonic Corporation of North America

Voltage Regulators
Note) The number in ( ) shows the pin number for the AN8021SB.
Pin No.
(3)(4)
Terminal Equivalent Circuits (continued)
(2)
(5)
(6)
6
7
8
9
V
SV
REF
PV
CC
CC
comp.
PWM
Equivalent circuit
Comp.
conversion
5 A
I/V
6 V
8
500
(5)
9
500
(6)
(2)
6
V
The terminal for directly driving a power
MOSFET.
V
Supply voltage terminal.
It monitors the supply voltage and has operat-
ing threshold value for start/stop/OVP reset.
TIM/OVP:
The terminal with double functions such as OVP
(overcurrent protection) and timer latch termi-
nal.
[OVP]
When it receives the overvoltage signal of the
power supply output and high is input to the
terminal, internal circuit is turned off. At the
same time, this condition (latch) is hold. To re-
set the OVP latch, it is necessary to reduce V
under the release voltage.
[Timer latch]
The output voltage drop due to the overcurrent
condition of power supply output is detected
through the current level for IFB-input. When
I
charge current flows into the capacitor con-
nected to this terminal. When the capacitor is
charged to the threshold voltage of OVP, OVP
starts to operate and the IC stays stop.
IFB :
The terminal into which the current feedback
signal is input from the photocoupler of the
power supply output.
IFB
OUT
CC
becomes less than current of a certain value,
, (PV
:
CC
), (SV
Description
CC
):
AN8021L, AN8021SB
CC
I/O
O
I
I
5