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SM8131B 数据表(PDF) 6 Page - Nippon Precision Circuits Inc

部件名 SM8131B
功能描述  The SM8131B is a charge pump DC/DC converter that switches between 1 and 1.5 automatically.
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制造商  NPC [Nippon Precision Circuits Inc]
网页  http://www.npc.co.jp/en
标志 NPC - Nippon Precision Circuits Inc

SM8131B 数据表(HTML) 6 Page - Nippon Precision Circuits Inc

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SM8131B
NIPPON PRECISION CIRCUITS INC.—6
FUNCTIONAL DESCRIPTION
LED Drive Current Setting
The SM8131B LED drive current setting is controlled by the combination of resistance connected to ISET and
the EN input signals.
(1) Setting LED Drive Current using RSET
The maximum drive current per LED (when DATA
= 1) is determined by the external resistance connected to
ISET. For example, if ILED MAX = 15mA, from the graph below, a resistance “RSET” of 15kΩ should be con-
nected between ISET and GND. Note that while RSET can have a maximum resistance 50k
Ω, the total LED
output current must not exceed the maximum output current of 120mA.
(2) Setting LED Drive Current using EN Input Signals
The EN input ENABLE/DISABLE circuit, also simultaneously counts the number of input pulses using an
internal counter and adjusts the LED drive current setting in response. The internal 4-bit counter provides 16-
step (DATA
= 1 to 16) adjustment, where each step is 1/15th of the maximum current (ILED MAX) set by RSET.
On the 16th pulse (DATA
= 16), the LED drive current control circuit shuts down. On the 17th pulse (DATA =
1), the LED drive current is reset to the maximum current value. As the current is set to the maximum value on
the first pulse, applications without pulse input can also be employed (by controlling brightness using RSET).
ISET
GND
RSET
LED drive current maximum setting using RSET
0
10
20
30
40
50
0
10
20
30
40
50
RSET [k
Ω]
EN1
GND
EN input
pulse
12 3
LED drive current setting variation using EN input
pulse modulation
0
5
10
15
20
25
04
8
12
16
DATA set by EN input pulse
RSET=10k
RSET=15k
RSET=20k
Table. LED drive current setting and EN input pulse count
DATA
123456789
10
11
12
13
14
15
16
EN
pulse
count
123456789
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
ILED
15/15
14/15
13/15
12/15
11/15
10/15
9/15
8/15
7/15
6/15
5/15
4/15
3/15
2/15
1/15
0


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