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STPS1L60 Scheda tecnica(PDF) 10 Page - STMicroelectronics

Il numero della parte STPS1L60
Spiegazioni elettronici  Digital constant-current controller
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
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Overview of inverse buck converter
AN3151
10/34
Doc ID 17051 Rev 1
3
Overview of inverse buck converter
The inverse buck stage offers the advantages previously mentioned and is managed by the
same equations as the standard buck converter.
Here in short, some details related to the DC-DC converter stage, with further details of the
analog designing [3].
Theory of operation
The voltage across the L inductor is calculated using the following formula:
Equation 1
where:
●
VL=inductor voltage (V)
●
L=inductance (H)
●
IL=inductor current (A)
Figure 6.
Inverse buck converter (single-string)
The following equations were used in the design:
Table 1.
Electrical specs
Description
Symbol
Value
Unit
Input voltage
VIN
48
V
White LED
VF
Everlight EHP-AX08EL P03-V4
LED forward voltage
Vfmin=3.85 @ 700 mA
Vfmax=4.15 @ 700 mA
V
dt
di
L
V
l
L =


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