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L4971D Datasheet(PDF) 9 Page - STMicroelectronics

Part # L4971D
Description  1.5A STEP DOWN SWITCHING REGULATOR
Download  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4971D Datasheet(HTML) 9 Page - STMicroelectronics

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Figure 21. Load transient.
10
103
105
107
f(Hz)
102
104
106
108
-200
-150
-100
-50
GAIN
(dB)
0
50
Phase
0
45
90
135
D97IN787
GAIN
Phase
Figure 25. Open loop frequency and phase of er-
ror amplifier
15
20
25
30
35
40
45
50 VCCmax(V)
0
100
200
300
400
L
(
µH)
D97IN745
680nF
fsw=100KHz
470nF
330nF
220nF
100nF
Figure 23. Soft start capacitor selection Vs in-
ductor and Vccmax.
2
1
D97IN786
VCC
(V)
30
20
10
VO
(mV)
100
0
-100
1ms/DIV
IO = 1A
fsw = 100KHz
Figure 22. Line transient.
15
20
25
30
35
40
45
50 VCCmax(V)
0
100
200
300
L
(
µH)
56nF
fsw=200KHz
D97IN746
47nF
33nF
22nF
Figure 24. Soft start capacitor selection vs. In-
ductor and Vccmax.
L4971
9/12


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