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MAX16813 датащи(PDF) 21 Page - Maxim Integrated Products

номер детали MAX16813
подробное описание детали  Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller and Battery Disconnect
PDF  27 Pages
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производитель  MAXIM [Maxim Integrated Products]
домашняя страница  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX16813 датащи(HTML) 21 Page - Maxim Integrated Products

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Setting RSDT Pin Voltage
As described in the Short-LED Detection section, the
actual LED short detection threshold depends on the
RSDT pin voltage and the minimum current sink (OUT_)
voltage.
An optimum choice of RSDT voltage should take into
account the maximum voltage at the OUT_ pins when
the converter is regulating its output voltage based on the
OVP pin.
In particular, it is recommended that the OVP resistor
divider be selected to set the output voltage of the con-
verter (when using the OVP input) so that the voltage on
the OUT_ pins does not exceed a threshold that depends
on the RSDT setting. The plot in Figure 6 shows the
relationship between the RSDT voltage and the recom-
mended maximum OUT_ voltage, assuming all the active
channels are at the same voltage level.
With higher OUT_ voltages, an erroneous LED short
condition can sometimes be detected when the converter
output voltage is transitioning from regulation based on
the OVP input to regulation based on the OUT_ voltages.
The plot shown here can be used when selecting the OVP
resistor divider and the RSDT voltage. It is recommended
that the RSDT voltage be chosen to be below the curve.
In general, performance is improved when the OVP resis-
tor divider is selected to set a maximum output voltage
close to the maximum LED string voltage needed in the
application.
Figure 6. Maximum Output Voltage vs. RSDT Voltage
0.3
0
5
10
15
20
25
30
35
40
45
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1.9
2.1
2.3
2.5
VRSDT (V)
NOT
MAXIMUM OUT_VOLTAGE vs. RSDT VOLTAGE
WITH VCC = 5V
ACTIVE OUT_PINS AT THE SAME VOLTAGE LEVEL
RECOMMENDED
RECOMMENDED
Figure 6
MAX16813
Integrated, 4-Channel, High-Brightness
LED Driver with High-Voltage DC-DC Controller
and Battery Disconnect
www.maximintegrated.com
Maxim Integrated │ 21



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