NCP5623 데이터 시트보기 (PDF) - ON Semiconductor
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NCP5623 Datasheet PDF : 10 Pages
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NCP5623
30
25
20
15
10
5
0
0
5
10
15
20
25
30
35
Step
Figure 5. Output Current Programmed Value ( ILED = F(Step) )
PWM OPERATION
The built−in PWM are fully independent and can be
programmed to any value during the normal operation of the
NCP5623 chip. The PWM operate with five bits, yielding a
32 steps range to cover the full modulation (0 to 100%) of
the associated LED:
− PWM = $00 ³ the associated LED is fully OFF,
whatever be the programmed ILED value
− PWM > $00 but < $1F ³ the brightness of the
associated LED is set depending upon the PWM
modulation value
− PWM = $1F ³ the associated LED is fully ON, the
current being the one defined by the ILED value.
Each PWM is programmable, via the I2C port as depicted,
at any time under any sequence arrangement as requested by
the end system’s designer. The PWM does not change the
ILED value, but merely modulate the ON/OFF ratio of the
associated LED. Each step of the PWM represent 100/31 =
3.225% of the full range, the clock being 2.1 kHz (typical).
+Vcc
MCU
I2C Port
+Vbat
1 mF/6.3 V
C1
13
GND
12
SDA
9
SCL
11
R1 10
62 k 6
GND
2
U1
NCP5623
Vbat
Vdet
SDA
SCL
IREF
LED1
LED2
GND
GND
LED3
GND
IC NC NC IC
1 7 8 14
+5 V
C2
1 mF/6.3 V
GND D1
56
R1
42
G3
35
B4
LRTB−G6T
Figure 6. Basic RGB Application
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