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參數(shù)資料
| 型號(hào)： | L4978 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 2A Step Down Switching Regulator(步降開關(guān)穩(wěn)壓器) |
| 中文描述： | 第2A降壓開關(guān)穩(wěn)壓器（步降開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 4/13頁 |
| 文件大?。?/td> | 577K |
| 代理商： | L4978 |
L4978
4/13
Table 6. Electrical Characteristcs
(T
j
= 25°C, C
osc
= 2.7nF, R
osc
= 20k
, V
CC
= 24V, unless otherwise specified). “
●
"
Specification Referred
to T
j
from 0 to 125°C
Symbol
DYNAMIC CHARACTERISTIC
V
I
Operating input voltage range
V
o
Output voltage
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
o
= 3.3 to 50V; I
o
= 2A
I
o
= 0.5A
I
o
= 0.2 to 2A
V
cc
= 8 to 55V
●
8
55
V
3.33
3.36
3.39
V
3.292
3.22
3.36
3.36
0.58
3.427
3.5
0.733
1.173
3.5
V
V
V
V
A
●
V
d
Dropout voltage
V
cc
= 10V; I
o
= 2A
●
I
l
Maximum limiting current
V
cc
= 8 to 55V
V
o
= 3.3V; I
o
= 2A
●
2.5
3
Efficiency
87
%
f
s
Switching frequency
●
90
100
110
KHz
SVRR
Supply voltage ripple rejection
V
i
= V
cc
+2V
RMS
; V
o
= V
ref
;
I
o
= 2.5A; f
ripple
= 100Hz
V
cc
= 8 to 55V
60
dB
Switching Frequency Stability
vs.
V
cc
Temp. stability of switching
frequency
SOFT START
Soft start charge current
Soft start discharge current
INHIBIT
V
LL
Low level voltage
I
sLL
Isource Low level
DC CHARACTERISTICS
I
qop
Total operating quiescent
current
I
q
Quiescent current
I
qst-by
Total stand-by quiescent
current
3
6
%
T
j
= 0 to 125°C
4
%
30
6
40
10
50
14
μ
A
μ
A
●
0.9
V
μ
A
●
5
15
4
6
mA
Duty Cycle = 0; VFB= 3.8V
2.5
3.5
mA
μ
A
μ
A
V
inh
< 0.9V
V
cc
= 55V; V
inh
<0.9V
100
200
150
300
ERROR AMPLIFIER
V
FB
R
L
Voltage Feedback Input
3.33
3.36
3.39
V
Line regulation
V
cc
= 8 to 55V
5
10
mV
Ref. voltage stability vs
temperature
High level output voltage
●
0.4
mV/°C
V
oH
V
oL
I
o source
I
o sink
I
b
SVRR E/A Supply voltage ripple rejection
V
FB
= 2.5V
V
FB
= 3.8V
V
comp
= 6V; V
FB
= 2.5V
V
comp
= 6V; V
FB
= 3.8V
10.3
V
Low level output voltage
0.65
V
μ
A
μ
A
μ
A
Source output current
180
220
Sink output current
200
300
Source bias current
2
3
V
comp
= V
FB
; V
cc
= 8 to 55V
R
L
=
∞
I
comp
= -0.1 to 0.1mA
V
comp
= 6V
60
80
dB
DC open loop gain
50
57
dB
g
m
Transconductance
2.5
mS
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