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L4972AD 数据表(PDF) 8 Page - STMicroelectronics

部件名 L4972AD
功能描述  2A SWITCHINGREGULATOR
PDF  23 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) 8 Page - STMicroelectronics

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ELECTRICAL CHARACTERISTICS (continued)
DC CHARACTERISTICS
Symbo l
Parameter
T est Cond iti on
Mi n.
Typ.
Max.
Unit
F ig.
V11on
Turn-on Threshold
10
11
12
V
7A
V11 Hyst
Turn-off Hysteresys
1
V
7A
I11Q
Quiescent Current
V8 =0; S1 = D
13
19
mA
7A
I11OQ
Operating Supply Current
V8 = 0; S1 = B; S2 = B
16
23
mA
7A
I20L
Out Leak Current
Vi = 55V; S3 = A; V8 =0
2
mA
7A
SOFT START (pin 8)
Symbo l
Parameter
T est Cond iti on
Mi n.
Typ.
Max.
Unit
F ig.
I8
Soft Start Source Current
V8 = 3V; V9 = 0V
80
115
150
µA7B
V8
Output Saturation Voltage
I8 = 20mA; V11 = 10V
I8 = 200
µA; V11 = 10V
1
0.7
V
V
7B
7B
ERROR AMPLIFIER
Symbo l
Parameter
T est Cond iti on
Mi n.
Typ.
Max.
Unit
F ig.
V7H
High Level Out Voltage
I7 = 100
µA; S1 = C
V9 = 4.7V
6V
7C
V7L
Low Level Out Voltage
I7 = 100
µA; S1 = C
V9 = 5.3V;
1.2
V
7C
I7H
Source Output Current
V7 = 1V; V7 = 4.7V
100
150
µA7C
-I7L
Sink Output Current
V7 = 6V; V9 = 5.3V
100
150
µA7C
I9
Input Bias Current
S1 = B; RS = 10K
Ω
0.4
3
µA7C
GV
DC Open Loop Gain
S1 = A; RS =10
Ω
60
dB
7C
SVR
Supply Voltage Rejection
15 < Vi < 50V
60
80
dB
7C
VOS
Input Offset Voltage
RS =50
Ω S1 = A
2
10
mV
7C
RAMP GENERATOR (pin 18)
Symbo l
Parameter
T est Cond iti on
Mi n.
Typ.
Max.
Unit
F ig.
V18
Ramp Valley
S1 = B; S2 = B
1.2
1.5
V
7A
V18
Ramp Peak
S1 = B
Vi = 15V
S2 = B
Vi = 45V
2.5
5.5
V
V
7A
7A
I18
Min. Ramp Current
S1 = A; I17 = 100
µA
270
300
µA7A
I18
Max. Ramp Current
S1 = A; I17 = 1mA
2.4
2.7
mA
7A
SYNC FUNCTION (pin 10)
Symbo l
Parameter
T est Cond iti on
Mi n.
Typ.
Max.
Unit
F ig.
V10
Low Input Voltage
Vi = 15V to 50V; V8 =0;
S1 = B; S2 = B; S4 = B
–0.3
0.9
V
7A
V10
High Input voltage
V8 = 0;
S1 = B; S2 = B; S4 = B
2.5
5.5
V
7A
I10L
Sync Input Current with Low
Input Voltage
V10 =V18 = 0.9V; S4 = B;
S1 = B; S2 = B
0.4
mA
7A
I10H
Input Current with
High
Input Voltage
V10 = 2.5V
1.5
mA
7A
V10
Output Amplitude
4
5
V
–
tW
Output Pulse Width
Vthr = 2.5V
0.3
0.5
0.8
µs–
L4972A-L4972AD
8/23



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