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NCP5021
ILED Peak Current
The ILED peak current depends upon the reference
current (I REF pin) and the digital contain of the ILEDREG
register. The I2C port is used to setup the ILED peak current
stored into the ILEDREG register. The load current is
derived from the 1144 mV reference voltage provided by
the internal Band Gap associated to the external resistor
connected across I REF pin and Ground (see Figure 8). The
maximum ILED current is given by the internal current
mirror ratio (multiplier ? k ? ) equal to 250. In other word,
to get a 25 mA maximum, with a full $1F command, the
reference current shall be 25 mA/250 = 100 m A. This
current is used to calculate the resistor connected between
the IREF pin and GND: R REF = 1.144 / 100e ? 6 = 11.44 k W .
In any case, no voltage shall be forced at I REF pin, either
downward or upward.
The tolerance of the external resistor must be 1% or
better, with a 100 ppm thermal coefficient, to get the
expected overall tolerance.
VBandGap
600mV
LED Return
Pin 2 & 3
GND
R1
IREF
Pin 4
GND
Figure 8. Basic Reference Current Source
NOTE:
The I REF pin must never be biased by an external voltage higher than 1.44 V.
The ILED current is given by Table 9 as a percentage of the maximum programmed ILED value (100% will give 25 mA
when Iref = 100 m A).
Table 9. OUTPUT CURRENT PROGRAMMED VALUE (Iout % = F(Step))
$Step
00
01
02
03
04
05
06
07
Iout %
0.00
0.10
0.13
0.16
0.20
0.25
0.32
0.40
Step
08
09
0A
0B
0C
0D
0E
0F
Iout %
0.50
0.63
0.79
1.00
1.26
1.58
2.00
2.51
$Step
10
11
12
13
14
15
16
17
Iout %
3.16
3.98
5.01
6.31
7.94
10.00
12.59
15.85
$Step
18
19
1A
1B
1C
1D
1E
1F
Iout %
19.95
25.12
31.62
39.81
50.12
63.10
79.43
100.00
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