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L4970 数据表(PDF) 8 Page - STMicroelectronics

部件名 L4970
功能描述  10A SWITCHING REGULATOR
PDF  21 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4970 数据表(HTML) 8 Page - STMicroelectronics

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ELECTRICAL CHARACTERISTICS (continued)
RESET AND POWER FAIL FUNCTIONS
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
V11R
Rising Threshold Voltage
(pin 11)
Vi = 15 to 50V
V3 = 5.3V
Vref
–120
Vref
–100
Vref
–80
V
mV
7D
V11F
Falling Threshold Voltage
(pin 11)
Vi = 15 to 50V
V3 = 5.3V
4.77
Vref
–200
Vref
–160
V
mV
7D
V5H
Delay High Threshold
Voltage
Vi = 15 to 50V
V14 =V11
V3 = 5.3V
4.95
5.1
5.25
V
7D
V5L
Delay Low Threshold
Voltage
Vi = 15 to 50V
V14 =V11
V3 = 5.3V
1
1.1
1.2
V
7D
–I5SO
Delay Source Current
V3 = 5.3V; V5 =3V
40
60
80
µA7D
I5SI
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
µA7D
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
µA7D
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.
L4970A
8/21



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