User manual

Code Mercenaries
3
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5. Brightness control
The MOD input allows PWM dimming of the
LEDs.
By applying a voltage >1V≤Vin the current to the
LEDs is shut off. Frequencies up to about 1kHz
can be applied to the MOD input, though for good
regulator stability it is recommended to not exceed
about 500Hz.
Dimming ranges of about 1% to 100% are possi-
ble.
6. Regulator efficiency
The regulator efficieny depends on a number of
parameters. Since there are a couple constant
losses independent of the total power delivered by
the regulator the basic rule is that the regulator is
more efficient when used at higher power (i.e.
more LEDs connected). A lower difference
between input and output voltage does also
increase the efficiency.
6.1 Output current
The output current varies somewhat depending on
the forward voltage of LEDs and the input voltage.
If a more precise output current is required it can
be set by using the MOD input.
0 10 20 30
Input Voltage (V)
70
75
80
85
90
95
100
Efficiency (%)
1 LED
5 LED
3 LED
4LED
2 LED
Efficiency LW05-200
0 10 20 30
Input Voltage (V)
70
75
80
85
90
95
100
Efficiency (%)
2 LED
3 LED
4LED
5 LED
1 LED
Efficiency LW05-350
10 20 30
Input Voltage (V)
0,18
0,2
0,22
0,24
0,26
0,28
0,3
LED Current (A)
3 LED
5 LED
4 LED
2 LED
1 LED
Output Current LW05-200
V1.0.0 March 21st 2012