L4972 Просмотр технического описания (PDF) - STMicroelectronics
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L4972 Datasheet PDF : 23 Pages
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L4972A-L4972AD
ELECTRICAL CHARACTERISTICS (refer to the test circuit, TJ = 25°C, Vi = 35V, R4 = 30KΩ,
C9 = 2.7nF, fSW = 100KHztyp, unless otherwise specified)
DYNAMIC CHARACTERISTICS
Symbo l
Vi
Vo
∆Vo
∆Vo
Vd
I20L
η
SVR
f
∆f/∆Vi
∆f/Tj
fmax
Pa ram et er
T est Co nd itions
Input Volt. Range (pin 11) Vo = Vref to 40V
Io = 2A (**)
Output Voltage
Vi =15V to 50V
Io = 1A; Vo = Vref
Line Regulation
Vi = 15V to 50V
Io = 0.5A; Vo = Vref
Load Regulation
Vo = Vref Io = 0.5A to 2A
Dropout Voltage between Io = 2A
Pin 11 and 20
Max Limiting Current
Vi = 15V to 50V
Vo = Vref to 40V
Efficiency (*)
Io = 2A, f = 100KHz
Vo = Vref
Vo = 12V
Supply Voltage Ripple
Rejection
Vi = 2VRMS; Io = 1A
f = 100Hz; Vo = Vref
Switching Frequency
Voltage Stability
Switching
Frequency
of Vi = 15V to 45V
Temperature Stability of
Switching Frequency
Tj = 0 to 125°C
Maximum Operating
Switching Frequency
Vo = Vref R4 = 15KΩ
Io = 2A C9 = 2.2nF
(*) Only for DIP version (**) Pulse testing with a low duty cycle
Min.
15
T yp.
M ax.
50
Unit
V
5
5.1
5.2
V
12
30
mV
7
20
mV
0.25
0.4
V
2.5
2.8
3.5
A
75
85
%
90
%
56
60
dB
90
100
110
KHz
2
6
%
1
%
200
KHz
Vref SECTION (pin 13)
Symbo l
V13
∆V13
∆V13
∆ V13
∆T
I13 short
Pa ram et er
Reference Voltage
Line Regulation
Load Regulation
Average Temperature
Coefficient Reference
Voltage
Short Circuit Current Limit
T est Cond ition
Vi = 15V to 50V
I13 = 0 to 1mA
Tj = 0°C to 125°C
V13 = 0
Min.
5
T yp.
5.1
10
20
0.4
M ax.
5.2
25
40
Unit
V
mV
mV
mV/°C
70
mA
Fig.
5
5
5
5
5
5
5
Fig.
7
7
7
7
7
VSTART SECTION (pin 15)
Symbo l
V14
∆V14
∆V14
I14 short
Pa ram et er
Reference Voltage
Line Regulation
Load Regulation
Short Circuit Current Limit
T est Cond ition
Vi = 15 to 50V
I14 = 0 to 1mA
V15 = 0V
Min.
11.4
T yp.
12
0.6
50
80
M ax.
12.6
1.4
200
Unit
V
V
mV
mA
Fig.
7
7
7
7
7/23
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