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NCP5623B
Table 3. OUTPUT CURRENT PROGRAMMED VALUE (ILED = F(Step))
Step
0 / $00
1 / $01
2 / $02
3 / $03
4 / $04
5 / $05
6 / $06
7 / $07
8 / $08
ILED (mA)
0
0.92
0.95
0.98
1.02
1.06
1.10
1.15
1.20
Step
9 / $09
10 / $0A
11 / $0B
12 / $0C
13 / $0D
14 / $0E
15 / $0F
16 / $10
17 / $11
ILED (mA)
1.25
1.31
1.38
1.45
1.53
1.62
1.72
1.84
1.97
Step
18 / $12
19 / $13
20 / $14
21 / $15
22 / $16
23 / $17
24 / $18
25 / $19
26 / $1A
ILED (mA)
2.12
2.30
2.50
2.76
3.06
3.45
3.94
4.60
5.52
Step
27 $1B
28 / $1C
29 / $1D
30 / $1E
31 / $1F
ILED (mA)
6.90
9.20
13.80
27.60
27.60
NOTE:
30
25
20
15
10
5
The table assumes I REF = 11.5 m A
PWM OPERATION
The built ? in PWM are fully independent and can be
programmed to any value during the normal operation of the
NCP5623B 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. What’s more, none of PWM is changed by
NCP5623B during gradual dimming.
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. NCP5623B Typical Efficiency as a Function of the Vf
NOTE:
Efficiency is measured with the three PWM equal to 100%
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