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L4978 Datasheet(PDF) 9 Page - STMicroelectronics

Part # L4978
Description  2A STEP DOWN SWITCHING REGULATOR
PDF  13 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4978 Datasheet(HTML) 9 Page - STMicroelectronics

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L4978
Figure 24. Load transient.
.
Figure 25. Line transient.
.
Figure 26. Soft start capacitor selection Vs
inductor and Vccmax.
Figure 27. Soft start capacitor selection Vs
inductor and Vccmax.
Figure 28. Open loop frequency and phase of
error amplifier .
2
1
D97IN786
VCC
(V)
30
20
10
VO
(mV)
100
0
-100
1ms/DIV
IO = 1A
fsw = 100KHz
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
15
20
25
30
35
40
45
50 VCCmax(V)
0
100
200
300
L
(
µH)
56nF
fsw=200KHz
D97IN746
47nF
33nF
22nF
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



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