L4970 Просмотр технического описания (PDF) - STMicroelectronics
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L4970 Datasheet PDF : 21 Pages
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L4970A
ELECTRICAL CHARACTERISTICS (continued)
RESET AND POWER FAIL FUNCTIONS
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit Fig.
V11R
Rising Threshold Voltage Vi = 15 to 50V
(pin 11)
V3 = 5.3V
Vref
Vref
Vref
V
7D
–120 –100 –80
mV
V11F
Falling Threshold Voltage Vi = 15 to 50V
(pin 11)
V3 = 5.3V
4.77
Vref
Vref
V
7D
–200 –160 mV
V5H
Delay High Threshold
Vi = 15 to 50V
4.95
5.1
5.25
V
7D
Voltage
V14 = V11 V3 = 5.3V
V5L
Delay Low Threshold
Vi = 15 to 50V
1
1.1
1.2
V
7D
Voltage
V14 = V11 V3 = 5.3V
–I5SO Delay Source Current
V3 = 5.3V; V5 = 3V
40
60
80
µA
7D
I5 SI
Delay Sink Current
V3 = 4.7V; V5 = 3V
10
mA
7D
V4S
Out Saturation Voltage
I4 = 15mA; S1 = B
V3 = 4.7V
0.4
V
7D
I4
Output Leak Current
V4 = 50V; S1 = A
V3 = 5.3V
100
µA
7D
V3R
Rising Threshold Voltage V11 = V14
4.95
5.1
5.25
V
7D
V3H
Hysteresys
0.4
0.5
0.6
V
7D
I3
Input Bias Current
1
3
µA
7D
Figure 5: Test and Evaluation Board Circuit
TYPICAL PERFORMANCES (using evaluation board) :
n = 83% (Vi = 35V ; Vo = VREF ; Io = 10A ; fSW = 200KHz)
Vo RIPPLE = 30mV (at 10A) with output filter capacitor ESR ≤ 60mΩ
Line regulation = 5mV (Vi = 15 to 50V)
Load regulation = 15mV (Io = 2 to 10A)
For component values, refer to test circuit part list.
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