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L7981ATR Datasheet(PDF) 34 Page - STMicroelectronics

Part # L7981ATR
Description  3 A step-down switching regulator
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7981ATR Datasheet(HTML) 34 Page - STMicroelectronics

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Application informations
L7981
34/44
Doc ID 15182 Rev 3
Figure 28.
Load regulation
Figure 29.
Line regulation
Figure 30.
Load transient: from 0.4 A to 3 A
Figure 31.
Soft-start
Figure 32.
Short-circuit behavior
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
0
0.5
1
1.5
2
2.5
3
Io [A]
Vcc=5V
Vcc=12V
Vcc=24V
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
0.1
5
1015
2025
VCC [V]
Io=1A
Io=2A
Io=3A
VOUT
200mV/div
AC coupled
IL 1A/div
Time base 200us/div
VIN=24V
VOUT=3.3V
COUT=47uF
L=10uH
FSW=520k
IL 1A/div
VOUT 1V/div
Time base 1ms/div
IL 1A/div
VOUT 0.5V/div
Time base 1ms/div
I
L 1A/div
OUT 10V/div
V
OUT 1V/div
SHORTED OUTPUT
Time base 5ms/div
I
L 1A/div
OUT 10V/div
V
OUT 1V/div
SHORTED OUTPUT
Time base 5ms/div



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