L4972 데이터 시트보기 (PDF) - STMicroelectronics
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L4972 Datasheet PDF : 23 Pages
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L4972A-L4972AD
ELECTRICAL CHARACTERISTICS (continued)
RESET AND POWER FAIL FUNCTIONS
Symbo l
V9R
V9F
V2H
V2L
I2SO
I2SI
V3S
I3
V4R
V4H
I4
Pa ram et er
Rising Thereshold Voltage
(pin 9)
Falling Thereshold Voltage
(pin 9)
Delay High Threshold Volt.
Delay Low Threshold Volt.
Delay Source Current
Delay Source Sink Current
Output Saturation Voltage
Output Leak Current
Rising Threshold Voltage
Hysteresis
Input Bias Current
T est Co nd itions
Vi = 15 to 50V
V4 = 5.3V
Vi = 15 to 50V
V4 = 5.3V
Vi = 15 to 50V
V4 = 5.3V V9 = V13
Vi = 15 to 50V
V4 = 4.7V V9 = V13
V4 = 5.3V; V2 = 3V
V4 = 4.7V; V2 = 3V
I3 = 15mA; S1 = B V4 = 4.7V
V3 = 50V; S1 = A
V9 = V13
Min.
Vref
-130
4.77
4.95
1
30
10
4.95
0.4
T yp.
Vref
-100
Vref
-200
5.1
1.1
60
5.1
0.5
1
M ax.
Vref
-80
Vref
-160
5.25
1.2
80
0.4
100
5.25
0.6
3
Unit
V
mV
V
mV
V
V
µA
mA
V
µA
V
V
µA
Fig.
7D
7D
7D
7D
7D
7D
7D
7D
7D
7D
7D
F
TYPICAL PERFORMANCES (using evaluation board) :
n = 83% (Vi = 35V ; Vo = VREF ; Io = 2A ; fsw = 100KHz)
Vo RIPPLE = 30mV (at 1A)
Line regulation = 12mV (Vi = 15 to 50V)
Load regulation = 7mV (Io = 0.5 to 2A)
for component values Refer to the fig. 5 (Part list).
9/23
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