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NCP5623C
30
25
20
15
10
5
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
0
0
5 10 15 20 25 30
Step
Figure 4. Output Current Programmed
Value ( ILED = F(Step) )
35
? 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 I 2 C 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).
100
90
80
70
60
50
Vf = 2.85 V
Vf = 3.8 V
40
2.5
3.0
3.5
4.0
4.5
V BAT (V)
Figure 5. NCP5623C Typical Efficiency as a Function of the Vf
NOTE:
Efficiency is measured with the three PWM equal to 100%
+Vbat
C3
Vbat
+Vcc
MCU
I2C Port
GND
1 m F/6.3 V
C1
GND
SDA
SCL
GND R1
62 k
GND
11
7
9
6
8
220 nF
1 12
C1P C1N
Vout
LED3
SDA
SCL LED2
AGND
LED1
IREF GND
NCP5623C
U1
10
3
4
5
2
C2
1 m F/10 V
D3
D2
D1
GND
GND
Figure 6. Basic RGB Application
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