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參數(shù)資料
| 型號： | L4977A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Power Switching Regulator(功率開關(guān)穩(wěn)壓器) |
| 中文描述： | 電源開關(guān)穩(wěn)壓器（功率開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 7/21頁 |
| 文件大?。?/td> | 287K |
| 代理商： | L4977A |
ELECTRICALCHARACTERISTICS
(continued)
DCCHARACTERISTICS
Symbol
V
9on
V
9 Hyst
I
9Q
I
9OQ
I
7L
SOFT START
Parameter
Test Condition
Min.
10
Typ.
11
1
13
16
Max.
12
Unit
V
V
mA
mA
mA
Fig.
7A
7A
7A
7A
7A
Turn-on Threshold
Turn-off Hysteresys
Quiescent Current
Operating Supply Current
Out Leak Current
V
12
= 0; S1 = D
V
12
= 0; S1 = C; S2 = B
V
i
= 55V; S3 = A; V
12
= 0
19
23
2
Symbol
I
12
V
12
Parameter
Test Condition
V
12
= 3V; V
11
= 0V
I
12
= 20mA; V
9
= 10V
I
12
= 200
μ
A; V
9
= 10V
Min.
70
Typ.
100
Max.
130
1
0.7
Unit
μ
A
V
V
Fig.
7B
7B
7B
Soft Start Source Current
Output Saturation Voltage
ERROR AMPLIFIER
Symbol
V
10H
Parameter
Test Condition
I
10
= -100
μ
A; S1 = C
V
11
= 4.7V
I
10
= +100
μ
A; S1 = C
V
11
= 5.3V;
V
10
= 1V; S1 = E
V
11
= 4.7V
V
10
= 6V; S1 = D
V
11
= 5.3V
R
S
= 10K
V
VCM
= 4V;
R
S
= 10
15 < V
i
< 50V;
R
S
= 10
R
S
= 50
Min.
6
Typ.
Max.
Unit
V
Fig.
7C
High Level Out Voltage
V
10L
Low Level Out Voltage
1.2
V
7C
I
10H
Source Output Current
100
150
μ
A
7C
I
10L
Sink Output Current
100
150
μ
A
7C
I
11
G
V
Input Bias Current
DC Open Loop Gain
0.4
3
μ
A
dB
–
–
60
SVR
Supply Voltage Rejection
60
80
dB
–
V
OS
Input Offset Voltage
2
10
mV
–
RAMP GENERATOR(pin 2)
Symbol
V
2
V
2
Parameter
Test Condition
S1 = C; S2 = B
S1 = C
S2 = B
S1 = A; I
1
= 100
μ
A
S1 = A; I
1
= 1mA
Min.
1.2
Typ.
1.5
2.5
5.5
270
2.7
Max.
Unit
V
V
V
μ
A
mA
Fig.
7A
7A
7A
7A
7A
Ramp Valley
Ramp Peak
V
i
= 15V
V
i
= 45V
I
2
I
2
Min. Ramp Current
Max. Ramp Current
300
2.4
SYNC FUNCTION (pin 13)
Symbol
V
13
Parameter
Test Condition
V
i
= 15V to 50V; V
12
= 0;
S1 = C; S2 = B; S4 = B
V
12
= 0;
S1 = C; S2 = B; S4 = B
V
13
= V
2
= 0.9V; S4 = A;
S1 = C; S2 = B
V
13
= 3.5V; S4 = A;
S1 = C; S2 = B
Min.
–0.3
Typ.
Max.
0.9
Unit
V
Fig.
7A
Low Input Voltage
V
13
High Input voltage
3.5
5.5
V
7A
I
13L
Sync Input Current with
Low Input Voltage
Input Current with High
Input Voltage
Output Amplitude
Output Pulse Width
0.4
mA
7A
I
13H
1.5
mA
7A
V
13
t
W
4
5
V
μ
s
–
–
V
thr
= 2.5V
0.3
0.5
0.8
L4977A
7/21
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| L4978D013TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3 to 50V Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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