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LP8556 데이터시트(PDF) 21 Page - Texas Instruments

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부품명 LP8556
상세설명  High-Efficiency LED Backlight Driver for Tablets
PDF  52 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
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LP8556 데이터시트(HTML) 21 Page - Texas Instruments

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LP8556
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SNVS871B – JULY 2012 – REVISED SEPTEMBER 2012
SETTING FULL SCALE LED CURRENT
The maximum or full scale LED current is set either using an external set Resistor ( RISET) and CURRENT and
CURRENT_MAX EPROM bits or just using the CURRENT and CURRENT_MAX EPROM bits. Table 3
summarizes setting of the full scale LED current.
Table 3. Setting Full Scale LED Current
RISET [Ω]
ISET_EN
CURRENT_MAX
CURRENT[11:0]
Full Scale ILED [mA]
don't care
0
000
FFFh
5
don't care
0
001
FFFh
10
don't care
0
010
FFFh
15
don't care
0
011
FFFh
20
don't care
0
100
FFFh
23
don't care
0
101
FFFh
25
don't care
0
110
FFFh
30
don't care
0
111
FFFh
50
don't care
0
000 - 111
001h - FFFh
(1)
24k
1
000
FFFh
5
24k
1
001
FFFh
10
24k
1
010
FFFh
15
24k
1
011
FFFh
20
24k
1
100
FFFh
23
24k
1
101
FFFh
25
24k
1
110
FFFh
30
24k
1
111
FFFh
50
12k - 100k
1
000 - 111
001h - FFFh
(1)
(1)
See CFG0
SETTING PWM DIMMING FREQUENCY
LP8556 PWM dimming frequency can be set either by an external resistor, RFSET, or by pre-configuring EPROM
Memory (CFG5 register, PWM_FREQ[3:0] bits). Table 4 summarizes setting of the PWM dimming frequency.
Note that the RFSET is shared for setting the boost switching frequency, too. Setting the boost switching
frequency and PWM dimming frequency using an external resistor is shown in Table 5.
Copyright © 2012, Texas Instruments Incorporated
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