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参数资料
| 型号： | L4977A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 11 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PZFM15 |
| 封装： | PLASTIC, POWER PACK-15 |
| 文件页数： | 19/21页 |
| 文件大小： | 6754K |
| 代理商： | L4977A |
ELECTRICAL CHARACTERISTICS (continued)
DC CHARACTERISTICS
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
V9on
Turn-on Threshold
10
11
12
V
7A
V9 Hyst
Turn-off Hysteresys
1
V
7A
I9Q
Quiescent Current
V12 = 0; S1 = D
13
19
mA
7A
I9OQ
Operating Supply Current
V12 = 0; S1 = C; S2 = B
16
23
mA
7A
I7L
Out Leak Current
Vi = 55V; S3 = A; V12 = 0
2
mA
7A
SOFT START
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
I12
Soft Start Source Current
V12 = 3V; V11 = 0V
70
100
130
A7B
V12
Output Saturation Voltage
I12 = 20mA; V9 = 10V
I12 = 200
A; V9 = 10V
1
0.7
V
7B
ERROR AMPLIFIER
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
V10H
High Level Out Voltage
I10 = -100
A; S1 = C
V11 = 4.7V
6V
7C
V10L
Low Level Out Voltage
I10 = +100
A; S1 = C
V11 = 5.3V;
1.2
V
7C
I10H
Source Output Current
V10 = 1V; S1 = E
V11 = 4.7V
100
150
A7C
I10L
Sink Output Current
V10 = 6V; S1 = D
V11 = 5.3V
100
150
A7C
I11
Input Bias Current
RS = 10K
0.4
3
A–
GV
DC Open Loop Gain
VVCM = 4V;
RS = 10
60
dB
–
SVR
Supply Voltage Rejection
15 < Vi < 50V;
RS = 10
60
80
dB
–
VOS
Input Offset Voltage
RS = 50
210
mV
–
RAMP GENERATOR (pin 2)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
V2
Ramp Valley
S1 = C; S2 = B
1.2
1.5
V
7A
V2
Ramp Peak
S1 = C
Vi = 15V
S2 = B
Vi = 45V
2.5
5.5
V
7A
I2
Min. Ramp Current
S1 = A; I1 = 100
A
270
300
A7A
I2
Max. Ramp Current
S1 = A; I1 = 1mA
2.4
2.7
mA
7A
SYNC FUNCTION (pin 13)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
V13
Low Input Voltage
Vi = 15V to 50V; V12 = 0;
S1 = C; S2 = B; S4 = B
–0.3
0.9
V
7A
V13
High Input voltage
V12 = 0;
S1 = C; S2 = B; S4 = B
3.5
5.5
V
7A
I13L
Sync Input Current with
Low Input Voltage
V13 = V2 = 0.9V; S4 = A;
S1 = C; S2 = B
0.4
mA
7A
I13H
Input Current with High
Input Voltage
V13 = 3.5V; S4 = A;
S1 = C; S2 = B
2mA
7A
V13
Output Amplitude
4
5
V
–
tW
Output Pulse Width
Vthr = 2.5V
0.3
0.5
0.8
s–
L4977A
7/21
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