ncp5623 ON Semiconductor, ncp5623 Datasheet - Page 10

• Manufacturer Part Number: ncp5623
• Description: Triple Output Rgb Led Driver With I2c Control
• Manufacturer: ON Semiconductor

- PWM = $00 ³ the associated LED is fully OFF,
- PWM > $00 but < $1FF ³ the brightness of the
PWM OPERATION
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:
NOTE:
The built-in PWM are fully independent and can be
whatever be the programmed IMAX value
associated LED is set depending upon the PWM
modulation value
Efficiency is measured with the three PWM equal to 100%
Figure 4. Output Current Programmed Value ( I
Figure 5. NCP5623 Typical Efficiency as a Function of the Vf
100
10
1
100
1
90
80
70
60
50
40
2.5
Vf = 2.85 V
6
3.0
http://onsemi.com
11
NCP5623
STEPS
NCP5623
16
V
10
BAT
3.5
- PWM = $1F ³ the associated LED is fully ON, the
at any time under any sequence arrangement as requested by
the end system's designer. The PWM does not change the
IMAX 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).
(V)
Vf = 3.8 V
Each PWM is programmable, via the I2C port as depicted,
current being the one defined by the IMAX value.
21
4.0
26
out
= F(Step) )
31
4.5