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AN937 Datasheet(PDF) 20 Page - STMicroelectronics

Part # AN937
Description  The L4971 is a 1.5 A monolithic dc-dc converter
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN937 Datasheet(HTML) 20 Page - STMicroelectronics

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Typical application
AN937
20/29
Doc ID 5655 Rev 15
Figure 24.
Ideal inductor value requested for 30% ripple current, as a function of
max. input voltage and output (fSW=150 kHz)
Figure 25.
Ideal inductor value requested for 30% ripple current, as a function of
max. input voltage and output (fSW=200 kHz)
The 120 µH value of the selected inductor is useful to keep the current ripple below
0.3*ILOAD over the input / output voltage range operating at 200 kHz.
0
5
10
15
20
25
30
35
40
45
0
18
36
54
72
90
108
126
144
162
180
Vin = 15V
Vin = 20V
Vin = 25V
Vin = 30V
Vin = 35V
Vin = 40V
Vin = 45V
Vout
0
5
10
15
20
25
30
35
40
45
0
14
28
42
56
70
84
98
112
126
140
Vin = 15V
Vin



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