Texas Instruments TPS61193-Q1EVM, Руководство пользователя

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M
a
x
im
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m
co
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ve
rte
r
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tp
u
t
vo
lta
g
e
(
V
)
R12 (k )
C011
V
MAX BOOST
= (
V
BG
R13
+ 0.0387 ) x R12 + V
BG
Boost Converter
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7.3 Voltage Control
Maximum boost converter voltage is defined by the feedback voltage divider R12 and R13.
Recommended value for R13 is 130 k
Ω . R12 value can be calculated with the following equation:
where
• V
BG
= 1.2 V
• R12, R13 values are in k Ω (2)
Figure 6. Converter Maximum Output Voltage vs R12
Maximum voltage should be chosen based on the maximum voltage required for LED strings.
Recommended maximum voltage is about 30% higher than maximum LED string voltage. Initial boost
voltage is about 88% of maximum voltage. Boost output voltage is adjusted automatically based on LED
current sink headroom voltage.
Default setting for boost maximum voltage is 37 V (R12 is 750 k Ω ).
10 TPS61193EVM Evaluation Module SNVU491 – October 2015
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