an8021ns Panasonic Corporation of North America, an8021ns Datasheet - Page 2

• Manufacturer Part Number: an8021ns
• Description: External Excitation Flyback Ac-dc Switching Power Supply Control Ic
• Manufacturer: Panasonic Corporation of North America

AN8021NS
Notes)
2
Pin No.
Supply voltage
OVP pin allowable application voltage
CLM pin allowable application voltage
Supply current
Steady-state output current
Peak output current
IFB pin allowable application current
Power dissipation
Operating temperature
Storage temperature
Pin Descriptions
Absolute Maximum Ratings
1
2
3
4
5
6
7
8
1. *1: Items other than the storage temperature and operating temperature are all stipulated for an ambient temperature T
2. Currents or voltages may not be applied to any pins not stipulated above. For circuit currents, a positive ( ) value
TIM/OVP
*2: Applies when T
indicates current flowing into the IC, and a negative ( ) value indicates current flowing out of the IC.
Symbol
Parameter
V
CLM
GND
V
IFB
CT
RT
OUT
CC
25 C.
*2
*1
*1
Direct power MOSFET drive output
Power supply. This pin monitored, and has threshold voltages for startup, stop, OVP reset,
and other functions.
OVP (overvoltage protection) and timer latch functions.
OVP:
Accepts a power supply overvoltage detection signal. When a high-level signal is input,
internal circuits are turned off and this state is latched. To reset this OVP latched state,
the V
Timer latch:
The IC detects output voltage drops due to overcurrent states in the power supply output by
monitoring the magnitude of the current input to the IFB pin. In particular, when the current
I
this pin externally. When that capacitor is charged to the OVP threshold voltage, OVP
operates and the IC keeps a stopped state.
Input for the current feedback signal provided from a photocoupler of the power supply
output.
Connection for the resistor that determines the charge and discharge currents of the triangular
wave. In this device, the charge and discharge currents are the same.
Connection for the capacitor used to generate the triangular wave.
Pulse-by-pulse overcurrent protection input. Normally, an external filter is required.
Ground
IFB
has fallen below a certain level, a charge current flows into the capacitor connected to
a
CC
85 C for the independent IC without a heat sink.
voltage should be lowered to below the release voltage.
Symbol
V
V
V
IFB
T
T
I
I
P
CLM
I
OVP
CC
OP
opr
CC
O
stg
D
Description
55 to 150
0.3 to 7.0
30 to 85
Rating
V
1 000
122
35
150
CC
5
Voltage Regulators
Unit
mW
mA
mA
mA
mA
V
V
V
C
C
a