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L4976 数据表(PDF) 6 Page - STMicroelectronics

部件名 L4976
功能描述  1A step down switching regulator
PDF  17 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4976 数据表(HTML) 6 Page - STMicroelectronics

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Electrical characteristics
L4976
6/17
4
Electrical characteristics
Table 5. Electrical characteristics
(TJ = 25°C, COSC = 2.7nF, ROSC = 20kΩ, VCC = 24V, unless otherwise specified.)
Symbol
Parameter
Test condition
Min
Typ
Max
Unit
Dynamic characteristic
VI
Operating input voltage range
VO = 3.3 to 50V; IO = 1A
(1)
855
V
VO
Output voltage
IO = 0.5A
3.33
3.36
3.39
V
IO = 0.2 to 1A
3.2923.363.427
V
VCC = 8 to 55V
(1)
3.22
3.36
3.5
V
Vd
Dropout voltage
VCC = 10V; IO = 1A
0.29
0.367
V
(1)
0.587
V
Il
Maximum limiting current
VCC = 8 to 55V
(1)
1.5
2
2.5
A
Efficiency
VO = 3.3V; IO = 1A
85
%
fs
Switching frequency
(1)
90
100
110
KHz
SVRR
Supply voltage ripple rejection
VI = VCC + 2VRMS; VO = Vref;
IO = 1.A; fripple = 100Hz
60
dB
Voltage stability of switching
frequency
VCC = 8 to 55V
36
%
Temp. stability of switching
frequency
TJ = 0 to 125°C
4%
Reference section
Reference voltage
5.0
5.1
5.2
V
Iref = 0 to 10mA;
(1)
4.950
5.1
5.250
V
VCC = 8 to 55V
Line regulation
Iref = 0mA;
510
mV
VCC = 8 to 55V
Load regulation
Vref = 0 to 5mA;
210
mV
VCC = 0 to 20mA
625
mV
Short circuit current
30
65
100
mA



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