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

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.

ABSOLUTE MAXIMUM RATINGS

Symbol

Pin

Parameter

Value

Unit

19

≤50mA) (*)

selflimit

V

20

Gate driv. output peak current (t = 1

µs)

SINK

2

Α

.

SOURCE

1.5

A

Gate driv. output voltage t = 0.1

µs-1

V

Voltages at pins 3, 14, 7, 6, 12, 15

-0.3 to 9

V

13

Error Amplifier Voltage

-0.3 to 8.5

V

4

AC Input Current

5

mA

Voltages at pin 8, 9

-0.5 to 7

V

5

Current Amplifier Volt. (Isource = -20mA; Isink = 20mA)

-0.3 to 8.5

V

17

Voltage at pin 17

-0.3 to 3

V

11, 18

Voltage at pin 11, 18

-0.3 to 7

V

18

Input Sink Current

15

mA

16

Frequency Modulation Sink Current (L4981B)

5

mA

16

Sync. Voltage (L4981A)

-0.3 to 7

V

2

Voltage at pin 2

Voltage at Pin 2 t = 1

µs

-0.3 to 5.5

-2

V

V

°C

(DIP20)

1

W

°C

(SO20)

0.6

W

Operating Ambient Temperature

-40 to 125

°C

StorageTemperature

-55 to 150

°C

(*) Maximum package power dissipation limits must be observed.

PIN CONNECTIONS (Top views)

L4981A

L4981B

L4981A - L4981B

2/17