L4981 STMicroelectronics, L4981 Datasheet - Page 2

• Manufacturer Part Number: L4981
• Description: L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode
• Manufacturer: STMicroelectronics

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
(*) Maximum package power dissipation limits must be observed.
PIN CONNECTIONS (Top views)
2/16
I
Symbol
FREQ-MOD
V
V
V
V
V
I
I
CA-OUT
VA-OUT
V
V
GDRV
COSC
P
T
GDRV
ROSC
SYNC
T
I
AC
IPK
CC
stg
tot
op
11, 18
Pin
19
20
13
17
18
16
16
4
5
2
.
L4981A
Supply Voltage (I
Gate driv. output peak current (t = 1 s)
Gate driv. output voltage t = 0.1 s
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 = 1 s
Power Dissipation at T
Power Dissipation at T
Operating Ambient Temperature
StorageTemperature
CC
50mA) (*)
Parameter
amb
amb
= 70 C
= 70 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.
(DIP20)
(SO20)
SOURCE
SINK
L4981B
-0.3 to 8.5
-0.3 to 8.5
-0.3 to 5.5
-40 to 125
-55 to 150
-0.3 to 9
-0.5 to 7
-0.3 to 3
-0.3 to 7
-0.3 to 7
selflimit
Value
1.5
0.6
15
-1
-2
2
5
5
1
Unit
mA
mA
mA
°C
°C
W
W
V
A
V
V
V
V
V
V
V
V
V
V