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NCP5623C Datasheet(PDF) 10 Page - ON Semiconductor

Part # NCP5623C
Description  Triple Output I2C Controlled RGB LED Driver
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP5623C Datasheet(HTML) 10 Page - ON Semiconductor

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NCP5623C
http://onsemi.com
10
Figure 4. Output Current Programmed
Value ( ILED = F(Step) )
Step
35
25
20
15
10
5
0
0
15
30
30
10
25
5
20
PWM OPERATION
The built−in PWM are fully independent and can be
programmed to any value during the normal operation of the
NCP5623C 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 100/32 =
3.125% of the full range, the clock being 2.1 kHz (typical).
Figure 5. NCP5623C Typical Efficiency as a Function of the Vf
VBAT (V)
4.5
4.0
3.5
3.0
2.5
40
70
100
50
60
90
80
Vf = 3.8 V
Vf = 2.85 V
NOTE: Efficiency is measured with the three PWM equal to 100%
Figure 6. Basic RGB Application
C3
220 nF
D3
D2
D1
C2
GND
C1
GND
SDA
R1
62 k
GND
SCL
GND
+Vbat
+Vcc
GND
MCU
I2C Port
C1P
1
Vbat
11
AGND
6
SDA
7
SCL
9
IREF
8
GND
2
LED1 5
LED2
4
LED3 3
Vout
10
C1N
12
U1
NCP5623C
1 mF/10 V
1 mF/6.3 V
GND


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