ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

SUPPLY VOLTAGE

Operating Supply Voltage

19.5

V

OVER VOLTAGE PROTECTION COMPARATOR

Rising Threshold Voltage

-20mV

5.1

+20mV

V

Hysteresis

180

250

320

mV

Input Bias Current

0.05

1

µA

Propagation delay to output

1

2

µs

OVER CURRENT PROTECTION COMPARATOR

Threshold Voltage

±30

mV

Propagation delay to Output

0.4

0.9

µs

Current Source Generator

only for L4981A

65

85

105

µA

Leakage Current

only for L4981B

5

µA

CURRENT AMPLIFIER SECTION

Input Offset Voltage

±2mV

Input Bias Current

-500

50

500

nA

Open Loop Gain

1.1V

70

100

dB

SVR

Supply Voltage Rejection

12V

68

90

dB

Output High Voltage

6.2

V

Output Low Voltage

0.9

V

Output Source Current

210

mA

Output Sink Current

2

10

mA

OUTPUT SECTION

Output Voltage Low

0.5

0.8

V

Output Voltage High

11.5

12.5

V

Output Voltage Rise Time

50

150

ns

Output Voltage Fall Time

30

100

ns

Voltage Clamp

13

16

19

V

TOTAL STANDBY CURRENT SECTION

Supply Current before start up

0.3

0.5

mA

Supply Current after turn on

Pin17 = Open

812

mA

Operating Supply Current

Pin20 = 1nF

12

16

mA

Zener Voltage

(*)

20

25

30

V

UNDER VOLTAGE LOCKOUT SECTION

Turn on Threshold

14.5

15.5

16.5

V

Turn off Threshold

9

10

11

V

Programmable Turn-on Threshold

Pin15 to GND = 33K

10.6

12

13.4

V

LOAD FEED FORWARD

Bias Current

70

140

µA

200

300

µA

Input Voltage Range

1.6

5.3

V

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

L4981A - L4981B

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