參數(shù)資料
型號： L4977A
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 11 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PZFM15
封裝： PLASTIC, POWER PACK-15
文件頁數(shù)： 18/21頁
文件大小： 6754K
代理商： L4977A
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tj = 25
°C, Vi = 35V, R4 = 16K,
C9 = 2.2nF, fSW = 200KHz typ, unless otherwise specified)
DYNAMIC CHARACTERISTICS
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
Vi
input Voltage Range (pin 9)
Vo = Vref to 40V
Io = 7A
15
50
V
5
Vo
Output Votage
Vi = 15V to 50V
Io = 3A; Vo = Vref
5
5.1
5.2
V
5
Vo
Line Regulation
Vi = 15V to 50V
Io = 2A; Vo = Vref
12
30
mV
5
Vo
Load Regulation
Vo = Vref
Io = 3A to 5A
Io = 2A to 7A
10
20
25
40
mV
5
Vd
Dropout Voltage Between
Pin 9 and 7
Io = 5A
Io = 7A
0.4
0.8
0.6
1.1
V
5
I7L
Max. Limiting Current
Vo = Vref to 40V
Vi = 15 to 50V
89.5
11
A
5
η
Efficiency
Io = 3A
Vo = Vref
Vo = 12V
70
75
80
%
5
Io = 7A
Vo = Vref
Vo = 12V
75
80
87
%
5
SVR
Supply Voltage Ripple
Reject.
Vi = 2VRMS; Io = 3A
f = 100Hz; Vo = Vref
56
60
dB
5
f
Switching Frequency
180
200
220
KHz
5
f
Vi
Voltage Stability of
Swiching Frequency
Vi = 15V to 45V
2
6
%
5
f
Tj
Temperature Stability of
Swiching Frequency
Tj = 0 to 125
°C1
%
5
fmax
Maximum Operating
Switching Frequency
Vo = Vref; R4 = 10K
Io = 7A; C9 = 1nF
500
KHz
5
Vref SECTION (pin 14)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
V14
Reference Voltage
5
5.1
5.2
V
7
V14
Line Regulation
Vi = 15V to 50V
10
25
mV
7
V14
Load Regulation
I14 = 0 to 1mA
20
40
mV
7
V14
T
Average Temperature
Coefficient Reference
Voltage
Tj = 0
°C to 125°C
0.4
mV/
°C7
I14 short
Short Circuit Current Limit
V14 = 0
70
mA
7
VSTART SECTION (pin 15)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Fig.
V15
Reference Voltage
11.4
12
12.6
V
7
V15
Line Regulation
Vi = 15 to 50V
0.6
1.4
V
7
V15
Load Regulation
I15 = 0 to 1mA
50
200
mV
7
I15 short
Short Circuit Current Limit
V15 = 0V
80
mA
7
L4977A
6/21
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