L4981A - L4981B
put filter; both the operating frequency modes
working with an average current mode PWM con-
troller, maintaining sinusoidal line current without
slope compensation.
Besides power MOSFET gate driver, precise volt-
age reference (externally available), error ampli-
fier, undervoltage lockout, current sense and the
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
I
GDRV
V
GDRV
V
VA-OUT
I
AC
V
CA-OUT
V
ROSC
I
COSC
I
FREQ-MOD
V
SYNC
V
IPK
P
tot
T
op
T
stg
13
4
5
17
11, 18
18
16
16
2
Pin
19
20
.
Gate driv. output voltage t = 0.1µs
Voltages at pins 3, 14, 7, 6, 12, 15
Error Amplifier Voltage
AC Input Current
Voltages at pin 8, 9
Current Amplifier Volt. (Isource = -20mA; Isink = 20mA)
Voltage at pin 17
Voltage at pin 11, 18
Input Sink Current
Frequency Modulation Sink Current (L4981B)
Sync. Voltage (L4981A)
Voltage at pin 2
Voltage at Pin 2 t = 1µs
Power Dissipation at T
amb
= 70°C
Power Dissipation at T
amb
= 70°C
Operating Ambient Temperature
StorageTemperature
(DIP20)
(SO20)
Parameter
Supply Voltage (I
CC
≤50mA)
(*)
Gate driv. output peak current (t = 1µs)
SINK
SOURCE
Value
selflimit
2
1.5
-1
-0.3 to 9
-0.3 to 8.5
5
-0.5 to 7
-0.3 to 8.5
-0.3 to 3
-0.3 to 7
15
5
-0.3 to 7
-0.3 to 5.5
-2
1
0.6
-40 to 125
-55 to 150
Unit
V
Α
A
V
V
V
mA
V
V
V
V
mA
mA
V
V
V
W
W
°C
°C
soft start are included. To limit the number of the
external components, the device integrates pro-
tections as overvoltage and overcurrent. The
overcurrent level can be programmed using a
simple resistor for L4981A. For a better precision
and for L4981B an external divider must be used.
(*) Maximum package power dissipation limits must be observed.
PIN CONNECTIONS
(Top views)
L4981A
L4981B
2/16
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