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L4972AD 数据表(PDF) 6 Page - STMicroelectronics

部件名 L4972AD
功能描述  2A SWITCHING REGULATOR
PDF  22 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4972AD 数据表(HTML) 6 Page - STMicroelectronics

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L4972A
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4
Electrical Characteristcs
Table 5. Electrical Characteristcs
Refer to the test circuit, TJ = 25°C, Vi = 35V, R4 = 30KΩ, C9 = 2.7nF, fSW = 100KHz typ, unless otherwise
specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
DYNAMIC CHARACTERISTICS
Vi
Input Volt. Range (pin 11)
Vo = Vref to 40V Io = 2A (**)
15
50
V
8
Vo
Output Voltage
Vi =15V to 50V Io= 1A;
Vo = Vref
5
5.1
5.2
V
8
∆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
8
f
Switching Frequency
90
100
110
KHz
8
∆f/∆Vi Voltage Stability of Switching
Frequency
Vi = 15V to 45V
2
6
%
8
∆f/Tj
Temperature Stability of
Switching Frequency
Tj = 0 to 125°C
1
%
8
fmax
Maximum Operating Switching
Frequency
Vo= Vref R4 = 15KΩ
Io = 2A C9= 2.2nF
200
KHz
8
(*) Only for DIP version (**) Pulse testing with a low duty cycle
Vref SECTION (pin 13)
V13
Reference Voltage
5
5.1
5.2
V
10
∆V13
Line Regulation
Vi = 15V to 50V
10
25
mV
10
∆V13
Load Regulation
I13 = 0 to 1mA
20
40
mV
10
∆V13 /∆T Average Temperature
Coefficient Reference Voltage
Tj = 0°C to 125°C
0.4
mV/°C
10
I13 short
Short Circuit Current Limit
V13 = 0
70
mA
10
VSTART SECTION (pin 15)
V14
Reference Voltage
11.4
12
12.6
V
10
∆V14
Line Regulation
Vi = 15 to 50V
0.6
1.4
V
10
∆V14
Load Regulation
I14 = 0 to 1mA
50
200
mV
10
I14 short
Short Circuit Current Limit
V15 = 0V
80
mA
10
DC CHARACTERISTICS
V11on
Turn-on Threshold
10
11
12
V
12
V11 Hyst Turn-off Hysteresys
1
V
12
I11Q
Quiescent Current
V8 = 0; S1 = D
13
19
mA
12
I11OQ
Operating Supply Current
V8 = 0; S1 = B; S2 = B
16
23
mA
12



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