L7986TA STMicroelectronics, L7986TA Datasheet - Page 34

• Manufacturer Part Number: L7986TA
• Description: 3A step-down switching regulator
• Manufacturer: STMicroelectronics

Specifications of L7986TA

• Low Dropout Operation: 100% duty cycle

Application informations
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Figure 27. Load regulation
Figure 29. Load transient: from 0.4 A to 3 A
Figure 31. Short-circuit behavior V
SYNCH
SYNCH
V
200mV/div
AC coupled
I
1A/div
1A/div
L
5V/div
5V/div
5V/div
5V/div
1V/div
1V/div
OUT
OUT
OUT
V
V
1A/div
3.350
3.345
3.340
3.335
3.330
3.325
3.320
3.315
3.310
3.305
OUT
OUT
I
I
L
L
0.00
Vin=5V
Vin=12V
Vin=24V
0.50
Time base 200us/div
1.00
Io [A]
1.50
2.00
Timebase 10us/div
Timebase 10us/div
IN
V
V
C
L=10uH
F
2.50
IN
OUT
SW
OUT
=12 V
=24V
=520k
=3.3V
=47uF
Doc ID 022098 Rev 1
3.00
Figure 28. Line regulation
Figure 30. Soft-start
Figure 32. Short-circuit behavior V
SYNCH
SYNCH
SYNCH
SYNCH
1A/div
1A/div
1A/div
1A/div
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div
1V/div
1V/div
1V/div
1V/div
OUT
OUT
OUT
OUT
V
V
V
V
3.3600
3.3550
3.3500
3.3450
3.3400
3.3350
3.3300
3.3250
3.3200
OUT
OUT
OUT
OUT
I
I
I
I
L
L
L
L
5.0
10.0
I
I
I
I
L
L
L
L
1A/div
0.5A/div
1A/div
0.5A/div
15.0
Time base 1ms/div
Time base 1ms/div
Time base 1ms/div
Time base 1ms/div
20.0
V
IN
[V]
25.0
30.0
Timebase 10us/div
Timebase 10us/div
IN
V
V
V
V
=24 V
OUT
OUT
OUT
OUT
35.0
L7986TA
Io=1A
Io=2A
Io=3A
1V/div
0.5V/div
1V/div
0.5V/div
40.0