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L99LD21 Fiches technique(PDF) 19 Page - STMicroelectronics

No de pièce L99LD21
Description  High power LED driver for automotive applications
PDF  73 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99LD21 Fiches technique(HTML) 19 Page - STMicroelectronics

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DS11130 Rev 5
19/73
L99LD21
Buck converters
72
Figure 7. Peak current control principle
At the beginning of a switching period the MOSFET M1 is turned on, and the inductor
current IL1 increases. The mosfet is activated for a minimum on-time TON_MIN in order to
avoid that the on-phase is ended up by spurious noise, which is caused by the switch-on.
During mosfet activation, the inductor current, IL1, increases until reaching a maximum
value, IL1_PEAK, which is set through a dedicated control register (see bits <23:18> and bits
<17:12> on Table 15: CR#2: Control Register 2). When IL1 reaches its peak value, the
switching mosfet is turned off. The mosfet remains off for a time TOFF, which is derived from
the configured constant VLED1xTOFF1 (see bits <11:8> and bits <7:4> on Table 15: CR#2:
Control Register 2), where VLED1 is the forward voltage of the LED string, which is
connected at the output of the buck converter 1.
During TOFF, the inductor current decreases by:
ΔI
L1_PP
V
LED 1
V
F_D1
–
()
L
1
--------------------------------------------- T
OFF1
V
LED 1 TOFF1
⋅
L
1
----------------------------------------
∼
⋅
=



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