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L4972 Datenblatt(PDF) 7 Page - STMicroelectronics

Teilenummer L4972
Bauteilbeschribung  2A SWITCHINGREGULATOR
PDF  23 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4972 Datenblatt(HTML) 7 Page - STMicroelectronics

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ELECTRICAL CHARACTERISTICS (refer to the test circuit, TJ =25
°C, Vi = 35V, R4 = 30KΩ,
C9 = 2.7nF, fSW = 100KHz typ, unless otherwise specified)
DYNAMIC CHARACTERISTICS
Symbo l
Parameter
T est Co nd iti ons
Mi n.
T yp.
Max.
Unit
Fig .
Vi
Input Volt. Range (pin 11)
Vo =Vref to 40V
Io = 2A (**)
15
50
V
5
Vo
Output Voltage
Vi =15V to 50V
Io = 1A; Vo =Vref
5
5.1
5.2
V
5
∆Vo
Line Regulation
Vi = 15V to 50V
Io = 0.5A; Vo =Vref
12
30
mV
∆Vo
Load Regulation
Vo =Vref Io = 0.5A to 2A
7
20
mV
Vd
Dropout Voltage between
Pin 11 and 20
Io = 2A
0.25
0.4
V
I20L
Max Limiting Current
Vi = 15V to 50V
Vo =Vref to 40V
2.5
2.8
3.5
A
η
Efficiency (*)
Io = 2A, f = 100KHz
Vo =Vref
Vo = 12V
75
85
90
%
%
SVR
Supply Voltage Ripple
Rejection
Vi = 2VRMS; Io =1A
f = 100Hz; Vo =Vref
56
60
dB
5
f
Switching Frequency
90
100
110
KHz
5
∆f/∆Vi
Voltage
Stability
of
Switching
Frequency
Vi = 15V to 45V
2
6
%
5
∆f/Tj
Temperature Stability of
Switching Frequency
Tj = 0 to 125
°C1
%
5
fmax
Maximum Operating
Switching Frequency
Vo =Vref R4 = 15K
Ω
Io =2A C9 = 2.2nF
200
KHz
5
(*) Only for DIP version
(**) Pulse testing with a low duty cycle
Vref SECTION (pin 13)
Symbo l
Parameter
T est Cond iti on
Mi n.
T yp.
Max.
Unit
Fig .
V13
Reference Voltage
5
5.1
5.2
V
7
∆V13
Line Regulation
Vi = 15V to 50V
10
25
mV
7
∆V13
Load Regulation
I13 = 0 to 1mA
20
40
mV
7
∆ V13
∆T
Average Temperature
Coefficient Reference
Voltage
Tj =0
°C to 125°C
0.4
mV/
°C7
I13 short
Short Circuit Current Limit
V13 = 0
70
mA
7
VSTART SECTION (pin 15)
Symbo l
Parameter
T est Cond iti on
Mi n.
T yp.
Max.
Unit
Fig .
V14
Reference Voltage
11.4
12
12.6
V
7
∆V14
Line Regulation
Vi = 15 to 50V
0.6
1.4
V
7
∆V14
Load Regulation
I14 = 0 to 1mA
50
200
mV
7
I14 short
Short Circuit Current Limit
V15 =0V
80
mA
7
L4972A-L4972AD
7/23



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