L5980 Datasheet, PDF (32/37 Pages) STMicroelectronics – 0.7A step-down switching regulator

L5980
Application informations
Figure 28. Load regulation
Figure 31. Load transient: from 0.1A to 0.7A
0.14
F_SW=250KHz
0.12
0.1
0.08
0.06
0.04
0.02
0
0.1
0.2
0.3
0.4
Io [A]
V_CC=3.3V
V_CC=5.0V
V_CC=12V
0.5
0.6
0.7
V_OUT
50mV/div
AC coupled
I_L
200mA/div
Time base 100µs/div
Load slew rate 2.5A/µs
C_OUT=47µF
L=15µH
F_SW=520KHz
Figure 29. Line regulation
Figure 32. Soft start
0.4
0.35
0.3
0.25
0.2
0.15
0.1
Io=0.7A
0.05
0
-0.05 ₂
4
6
8 10 12 14 16 18
VCC [V]
Figure 30. Short circuit behavior
I_L
500mA/div
Time base 1ms/div
V_OUT
500mV/div
V_FB
200mV/div
OUT
10V/div
OUTPUT
SHORTED
V_OUT
1V/div
I_L
250mA/div
Time base 5ms/div
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