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参数资料
| 型号： | L4972AD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | PLASTIC, SO-20 |
| 文件页数： | 20/22页 |
| 文件大小： | 1370K |
| 代理商： | L4972AD |
7/22
L4972A
I20L
Out Leak Current
Vi = 55V; S3 = A; V8= 0
2
mA
12
SOFT START (pin 8)
I8
Soft Start Source Current
V8 = 3V; V9= 0V
80
115
150
A
13
V8
Output Saturation Voltage
I8 = 20mA; V11= 10V
I8= 200A; V11= 10V
1
0.7
V
13
ERROR AMPLIFIER
V7H
High Level Out Voltage
I7 = 100A; S1 = C; V9 = 4.7V
6
V
14
V7L
Low Level Out Voltage
I7 = 100A; S1 = C; V9= 5.3V
1.2
V
14
I7H
Source Output Current
V7 = 1V; V7 = 4.7V
100
150
A
14
-I7L
Sink Output Current
V7 = 6V; V9 = 5.3V
100
150
A
14
I9
Input Bias Current
S1 = B; RS = 10K
0.4
3
A
14
GV
DC Open Loop Gain
S1 = A; RS= 10
60
dB
14
SVR
Supply Voltage Rejection
15 < Vi < 50V
60
80
dB
14
VOS
Input Offset Voltage
RS= 50 S1 = A
2
10
mV
14
RAMP GENERATOR (pin 18)
V18
Ramp Valley
S1 = B; S2 = B
1.2
1.5
V
12
V18
Ramp Peak
S1 = B; S2 = B
Vi = 15V
Vi = 45V
2.5
5.5
V
12
I18
Min. Ramp Current
S1 = A; I17= 100A
270
300
A
12
I18
Max. Ramp Current
S1 = A; I17= 1mA
2.4
2.7
mA
12
SYNC FUNCTION (pin 10)
V10
Low Input Voltage
Vi = 15V to 50V; V8 = 0;
S1 = B; S2 = B; S4 = B
–0.3
0.9
V
12
V10
High Input voltage
V8 = 0; S1 = B; S2 = B; S4 = B
2.5
5.5
V
12
I10L
Sync Input Current with Low
Input Voltage
V10= V18= 0.9V; S4 = B;
S1 = B; S2 = B
0.4
mA
12
I10H
Input Current with High
Input Voltage
V10= 2.5V
1.5
mA
12
V10
Output Amplitude
4
5
V
–
tW
Output Pulse Width
Vthr = 2.5V
0.3
0.5
0.8
s
–
RESET AND POWER FAIL FUNCTIONS
V9R
Rising Thereshold Voltage (pin 9) Vi = 15 to 50V
V4 = 5.3V
Vref
-130
Vref
-100
Vref
-80
V
mV
15
V9F
Falling Thereshold Voltage (pin 9) Vi = 15 to 50V
V4 = 5.3V
4.77
Vref
-200
Vref
-160
V
mV
15
V2H
Delay High Threshold Volt.
Vi = 15 to 50V
V4 = 5.3V; V9 = V13
4.95
5.1
5.25
V
15
V2L
Delay Low Threshold Volt.
Vi = 15 to 50V;V4 = 4.7V; V9 = V13
1
1.1
1.2
V
15
I2SO
Delay Source Current
V4 = 5.3V; V2 = 3V
30
60
80
A15
I2SI
Delay Source Sink Current
V4 = 4.7V; V2 = 3V
10
mA
15
V3S
Output Saturation Voltage
I3 = 15mA; S1 = B V4 = 4.7V
0.4
V
15
I3
Output Leak Current
V3 = 50V; S1 = A
100
A15
Table 5. Electrical Characteristcs (continued)
Refer to the test circuit, TJ = 25°C, Vi = 35V, R4 = 30K, C9 = 2.7nF, fSW = 100KHz typ, unless otherwise
specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
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