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L7986 Datasheet(PDF) 33 Page - STMicroelectronics

Part # L7986
Description  3 A step-down switching regulator
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7986 Datasheet(HTML) 33 Page - STMicroelectronics

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DocID022450 Rev 6
33/43
L7986
Application information
43
Figure 28. Load regulation
Figure 29. Line regulation
3.305
3.310
3.315
3.320
3.325
3.330
3.335
3.340
3.345
3.350
0.00
0.50
1.00
1.50
2.00
2.50
3.00
Io [A]
Vin=5V
Vin=12V
Vin=24V
3.3200
3.3250
3.3300
3.3350
3.3400
3.3450
3.3500
3.3550
3.3600
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
VIN [V]
Io=1A
Io=2A
Io=3A
Figure 30. Load transient: from 0.4 A to 2 A
Figure 31. Soft-start
VOUT
200mV/div
AC coupled
IL 1A/div
Time base 200us/div
VIN=24V
VOUT=3.3V
COUT=47uF
L=10uH
FSW=520k
I
L 1A/div
VOUT 1V/div
Time base 1ms/div
I
L 0.5A/div
VOUT 0.5V/div
Time base 1ms/div
I
L 1A/div
VOUT 1V/div
Time base 1ms/div
I
L 0.5A/div
VOUT 0.5V/div
Time base 1ms/div
Figure 32. Short-circuit behavior VIN = 12 V
Figure 33. Short-circuit behavior VIN = 24 V
OUT
5V/div
I
L
1A/div
V
OUT
1V/div
SYNCH
5V/div
Timebase 10us/div
OUT
5V/div
I
L
1A/div
V
OUT
1V/div
SYNCH
5V/div
Timebase 10us/div
OUT
5V/div
I
L
1A/div
V
OUT
1V/div
SYNCH
5V/div
Timebase 10us/div
OUT
5V/div
I
L
1A/div
V
OUT
1V/div
SYNCH
5V/div
OUT
5V/div
I
L
1A/div
V
OUT
1V/div
SYNCH
5V/div
OUT
5V/div
I
L
1A/div
V
OUT
1V/div
SYNCH
5V/div
Timebase 10us/div



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