Datasheet

ELECTRICAL CHARACTERISTICS
(continued)
RESET AND POWER FAIL FUNCTIONS
Symbol Parameter Test Condition Min. Typ. Max. Unit Fig.
V
11R
Rising Threshold Voltage
(pin 11)
V
i
= 15 to 50V
V
3
= 5.3V
V
ref
–120
V
ref
–100
V
ref
–80
V
mV
7D
V
11F
Falling Threshold Voltage
(pin 11)
Vi = 15 to 50V
V
3
= 5.3V
4.77 V
ref
–200
V
ref
–160
V
mV
7D
V
5H
Delay High Threshold
Voltage
V
i
= 15 to 50V
V
11
= V
14
V
3
= 5.3V
4.95 5.1 5.25 V 7D
V
5L
Delay Low Threshold
Voltage
Vi = 15 to 50V
V
11
= V
14
V
3
= 5.3V
1 1.1 1.2 V 7D
–I
5SO
Delay Source Current V
3
= 5.3V; V
5
= 3V 40 60 80 µA7D
I
5SI
Delay Sink Current V
3
= 4.7V; V
5
= 3V 10 mA 7D
V
4S
Out Saturation Voltage I
4
= 15mA; S1 = B
V
3
= 4.7V
0.4 V 7D
I
4
Output Leak Current V
4
= 50V; S1 = A
V
3
= 5.3V
100 µA7D
V
3R
Rising Threshold Voltage V
11
= V
14
4.95 5.1 5.25 V 7D
V
3H
Hysteresys 0.4 0.5 0.6 V 7D
I
3
Input Bias Current 1 3 µA7D
Figure 5:
Test and Evaluation Board Circuit
TYPICAL PERFORMANCES (using evaluation board) :
n = 83% (V
i
= 35V ; V
o
= V
REF
; I
o
= 7A ; f
SW
= 200KHz)
V
o RIPPLE
= 30mV (at 7A) with output filter capacitor ESR
≤
60m
Ω
Line regulation = 5mV (V
i
= 15 to 50V)
Load regulation = 15mV (I
o
= 2 to 7A)
For component values, refer to test circuit part list.
L4977A
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