L4970 데이터 시트보기 (PDF) - STMicroelectronics
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L4970 Datasheet PDF : 21 Pages
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L4970A
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tj = 25°C, Vi = 35V, R4 = 16KΩ,
C9 = 2.2nF, fSW = 200KHz typ, unless otherwise specified)
DYNAMIC CHARACTERISTICS
Symbol
Parameter
Vi
input Voltage Range (pin 9)
Vo
Output Votage
∆Vo
Line Regulation
∆Vo
Load Regulation
Vd
Dropout Voltage Between
Pin 9 and 7
I7 L
Max. Limiting Current
η
Efficiency
SVR
Supply Voltage Ripple
Reject.
f
Switching Frequency
∆f
Voltage Stability of
∆ Vi
Swiching Frequency
∆f
Temperature Stability of
Tj
Swiching Frequency
fmax
Maximum Operating
Switching Frequency
Vref SECTION (pin 14)
Test Condition
Vo = Vref to 40V
Io = 10A
Vi = 15V to 50V
Io = 5A; Vo = Vref
Vi = 15V to 50V
Io = 5A; Vo = Vref
Vo = Vref
Io = 3A to 6A
Io = 2A to 10A
Io = 5A
Io = 10A
Vi = 15 to 50V
Io = 5A
Vo = Vref
Vo = 12V
Io = 10A
Vo = Vref
Vo = 12V
Vi = 2VRMS; Io = 5A
f = 100Hz; Vo = Vref
Vi = 15V to 45V
Tj = 0 to 125°C
Vo = Vref; R4 = 10KΩ
Io = 10A; C9 = 1nF
Min. Typ. Max. Unit Fig.
15
50
V
5
5
5.1
5.2
V
5
12
30
mV
5
5
10
30
mV
20
50
mV
0.55
0.8
V
5
1.1
1.6
V
11
13
15
A
5
80
85
92
5
%
%
75
80
87
5
%
%
56
60
dB
5
180
200
220
KHz
5
2
6
%
5
1
%
5
500
KHz
5
Symbol
Parameter
V14
∆V14
∆V14
∆ V14
∆T
Reference Voltage
Line Regulation
Load Regulation
Average Temperature
Coefficient Reference
Voltage
I14 short Short Circuit Current Limit
VSTART SECTION (pin 15)
Test Condition
Vi = 15V to 50V
I14 = 0 to 1mA
Tj = 0°C to 125°C
V14 = 0
Min.
5
Typ.
5.1
10
20
0.4
Max. Unit Fig.
5.2
V
7
25
mV
7
40
mV
7
mV/°C
7
70
mA
7
Symbol
V15
∆V15
∆V15
I15 short
Parameter
Reference Voltage
Line Regulation
Load Regulation
Short Circuit Current Limit
Test Condition
Vi = 15 to 50V
I15 = 0 to 1mA
V15 = 0V
Min. Typ. Max. Unit Fig.
11.4
12
12.6
V
7
0.6
1.4
V
7
50
200
mV
7
80
mA
7
6/21
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