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AN4501 Datasheet(PDF) 41 Page - STMicroelectronics

Part # AN4501
Description  Design of a boost LED driver using L99LD01
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4501 Datasheet(HTML) 41 Page - STMicroelectronics

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AN4501
Calculation details
47
Appendix B
Calculation details
8.4
Calculation of the duty cycle in CCM
During tON, the inductor is magnetized by the voltage VL,ON = VIN – VSW
Figure 19. Inductor voltage during the on-phase
As the relation between the inductor’s current and voltage is
, Integrating over
tON gives:
During tOFF, the inductor is demagnetized by the voltage VL,OFF = VIN – VOUT – VFDIODE
Figure 20. Inductor voltage during the off-phase
V
L
L
di
L
dt
--------
=
ΔI
LON
V
LON
,
L
-----------------
t
ON
×
V
IN
V
SW
–
L
---------------------------- t
ON
⋅
V
IN
V
SW
–
L
----------------------------
D
F
SW
------------
×
==
=



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