Datasheet

ELECTRICAL CHARACTERISTICS (continued)
DC CHARACTERISTICS
Symbol Parameter Test Condition Min. Typ. Max. Unit Fig.
V
11on
Turn-on Threshold 10 11 12 V 7A
V
11 Hyst
Turn-off Hysteresys 1 V 7A
I
11Q
Quiescent Current V
8
=0; S1=D 13 19 mA 7A
I
11OQ
Operating Supply Current V8 = 0; S1 = B; S2 = B 16 23 mA 7A
I
20L
Out Leak Current V
i
= 55V; S3 = A; V
8
=0 2 mA 7A
SOFT START (pin 8)
Symbol Parameter Test Condition Min. Typ. Max. Unit Fig.
I
8
Soft Start Source Current V8 = 3V; V
9
= 0V 80 115 150 µA7B
V
8
Output Saturation Voltage I8 = 20mA; V
11
= 10V
I
8
= 200µA; V
11
= 10V
1
0.7
V
V
7B
7B
ERROR AMPLIFIER
Symbol Parameter Test Condition Min. Typ. Max. Unit Fig.
V
7H
High Level Out Voltage I
7
= 100µA; S1 = C
V
9
= 4.7V
6V7C
V
7L
Low Level Out Voltage I7 = 100µA; S1 = C
V
9
= 5.3V;
1.2 V 7C
I
7H
Source Output Current V
7
= 1V;V
7
= 4.7V 100 150 µA7C
-I
7L
Sink Output Current V7 = 6V;V
9
= 5.3V 100 150 µA7C
I
9
Input Bias Current S1 = B; RS =10KΩ 0.4 3 µA7C
G
V
DC Open Loop Gain S1 = A; R
S
=10Ω 60 dB 7C
SVR Supply Voltage Rejection 15 < V
i
< 50V 60 80 dB 7C
V
OS
Input Offset Voltage R
S
=50Ω S1 = A 2 10 mV 7C
RAMP GENERATOR (pin 18)
Symbol Parameter Test Condition Min. Typ. Max. Unit Fig.
V
18
Ramp Valley S1 = B; S2 = B 1.2 1.5 V 7A
V
18
Ramp Peak S1 = B Vi = 15V
S2 = B V
i
=45V
2.5
5.5
V
V
7A
7A
I
18
Min. Ramp Current S1 = A; I
17
= 100µA 270 300 µA7A
I
18
Max. Ramp Current S1 = A; I17 = 1mA 2.4 2.7 mA 7A
SYNC FUNCTION (pin 10)
Symbol Parameter Test Condition Min. Typ. Max. Unit Fig.
V
10
Low Input Voltage V
i
= 15V to 50V; V
8
=0;
S1 = B; S2 = B; S4 = B
–0.3 0.9 V 7A
V
10
High Input voltage V8 = 0;
S1 = B; S2 = B; S4 = B
2.5 5.5 V 7A
I
10L
Sync Input Current withLow
Input Voltage
V
10
=V
18
= 0.9V; S4 = B;
S1 = B; S2= B
0.4 mA 7A
I
10H
Input Current with High
Input Voltage
V10 = 2.5V 1.5 mA 7A
V
10
Output Amplitude 4 5 V –
t
W
Output Pulse Width V
thr
= 2.5V 0.3 0.5 0.8 µs–
L4972A-L4972AD
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