L4978 查看數據表（PDF） - STMicroelectronics
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L4978 Datasheet PDF : 13 Pages
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L4978
Table 6. Electrical Characteristcs
(Tj = 25°C, Cosc = 2.7nF, Rosc = 20kΩ, VCC = 24V, unless otherwise specified). “●" Specification Referred
to Tj from 0 to 125°C
Symbol
Parameter
DYNAMIC CHARACTERISTIC
VI
Operating input voltage range
Vo
Output voltage
Vd
Dropout voltage
Test Condition
Vo = 3.3 to 50V; Io = 2A
Io = 0.5A
Io = 0.2 to 2A
Vcc = 8 to 55V
Vcc = 10V; Io = 2A
Il
fs
SVRR
Maximum limiting current
Efficiency
Switching frequency
Supply voltage ripple rejection
Switching Frequency Stability
vs. Vcc
Temp. stability of switching
frequency
SOFT START
Soft start charge current
Soft start discharge current
INHIBIT
VLL
Low level voltage
IsLL
Isource Low level
DC CHARACTERISTICS
Iqop
Total operating quiescent
current
Iq
Quiescent current
Iqst-by
Total stand-by quiescent
current
ERROR AMPLIFIER
VFB
RL
VoH
VoL
Io source
Io sink
Ib
SVRR E/A
Voltage Feedback Input
Line regulation
Ref. voltage stability vs
temperature
High level output voltage
Low level output voltage
Source output current
Sink output current
Source bias current
Supply voltage ripple rejection
DC open loop gain
gm
Transconductance
Vcc = 8 to 55V
Vo = 3.3V; Io= 2A
Vi = Vcc+2VRMS; Vo= Vref;
Io = 2.5A; f ripple= 100Hz
Vcc = 8 to 55V
Tj = 0 to 125°C
Duty Cycle = 0; VFB= 3.8V
Vinh < 0.9V
Vcc = 55V; Vinh<0.9V
Vcc = 8 to 55V
VFB = 2.5V
VFB = 3.8V
Vcomp= 6V; VFB= 2.5V
Vcomp = 6V; VFB= 3.8V
Vcomp = VFB; Vcc = 8 to 55V
RL= ∞
Icomp = -0.1 to 0.1mA
Vcomp = 6V
Min.
●
8
3.33
3.292
● 3.22
●
● 2.5
●
90
60
30
6
●
●
3.33
●
10.3
180
200
60
50
Typ.
3.36
3.36
3.36
0.58
3
87
100
3
4
40
10
5
4
2.5
100
150
3.36
5
0.4
220
300
2
80
57
2.5
Max. Unit
55
V
3.39
V
3.427 V
3.5
V
0.733 V
1.173 V
3.5
A
%
110 KHz
dB
6
%
%
50
µA
14
µA
0.9
V
15
µA
6
mA
3.5
mA
200
µA
300
µA
3.39
V
10
mV
mV/°C
V
0.65
V
µA
µA
3
µA
dB
dB
mS
4/13
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