Datasheet
ELECTRICAL CHARACTERISTICS
(continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
SUPPLY VOLTAGE
V
CC
Operating Supply Voltage 19.5 V
OVER VOLTAGE PROTECTION COMPARATOR
V
thr
Rising Threshold Voltage V
ref
-20mV
5.1 V
ref
+20mV
V
V
3Hys
Hysteresis 180 250 320 mV
I
3
Input Bias Current 0.05 1 µA
t
d
Propagation delay to output V
OVP
= V
thr
+100mV 1 2 µs
OVER CURRENT PROTECTION COMPARATOR
V
th
Threshold Voltage ±30 mV
t
d
Propagation delay to Output V
OCP
= V
thr
-0.2V 0.4 0.9 µs
I
ipk
Current Source Generator V
IPK
= -0.1V
only for L4981A
65 85 105 µA
I
L
Leakage Current V
IPK
= -0.1V
only for L4981B
5 µA
CURRENT AMPLIFIER SECTION
V
offset
Input Offset Voltage V
MULT OUT
= V
SENSE
= 3.5V ±2mV
I
9bias
Input Bias Current V
SENSE
= 0V -500 50 500 nA
Open Loop Gain 1.1V ≤ V
CA OUT
≤ 6V 70 100 dB
SVR Supply Voltage Rejection 12V ≤ V
CC
≤ 19V
V
MULT OUT
= 3.5V V
SENSE
= 3.5V
68 90 dB
V
5H
Output High Voltage V
MULT OUT
= 200mV
I
CA OUT
= -0.5mA, V
IAC
= 0V
6.2 V
V
5L
Output Low Voltage V
MULT OUT
= -200mV
I
CA OUT
= 0.5mA, V
IAC
= 0V
0.9 V
-I
5
Output Source Current V
MULT OUT
= 200mV,
V
IAC
= 0V, V
CA-OUT
= 3.5V
210 mA
I
5
Output Sink Current 2 10 mA
OUTPUT SECTION
V
20L
Output Voltage Low I
SINK
= 250mA 0.5 0.8 V
V
20H
Output Voltage High I
SOURCE
= 250mA
V
CC
= 15V
11.5 12.5 V
t
r
Output Voltage Rise Time C
OUT
= 1nF 50 150 ns
t
f
Output Voltage Fall Time C
OUT
= 1nF 30 100 ns
V
GDRV
Voltage Clamp I
SOURCE
= 0mA 13 16 19 V
TOTAL STANDBY CURRENT SECTION
I
19start
Supply Current before start up V
CC
= 14V 0.3 0.5 mA
I
19on
Supply Current after turn on V
IAC
= 0V, V
COSC
= 0,
Pin17 = Open
812mA
I
19
Operating Supply Current Pin20 = 1nF 12 16 mA
V
CC
Zener Voltage (*) 20 25 30 V
UNDER VOLTAGE LOCKOUT SECTION
V
th ON
Turn on Threshold 14.5 15.5 16.5 V
V
th OFF
Turn off Threshold 9 10 11 V
Programmable Turn-on Threshold Pin 15 to V
CC
= 220K
Pin15 to GND = 33K
10.6 12 13.4 V
LOAD FEED FORWARD
I
LFF
Bias Current V
6
= 1.6V 70 140 µA
V
6
= 5.3V 200 300 µA
V
I
Input Voltage Range 1.6 5.3 V
(*) Maximum package power dissipation limits must be observed.
L4981A - L4981B
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