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AD8240YRM-REEL Fiches technique(PDF) 6 Page - Analog Devices

No de pièce AD8240YRM-REEL
Description  LED Driver/Monitor
Download  12 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD8240YRM-REEL Fiches technique(HTML) 6 Page - Analog Devices

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AD8240
Rev. 0 | Page 6 of 12
USING/EVALUATING THE AD8240 LED DRIVER MONITOR
Figure 3 shows a connection diagram for a typical application.
SETUP
In order to set up and evaluate the AD8240, the following
components and equipment are needed:
A shunt resistor (typically 0.1 Ω to 0.5 Ω depending on the
load). See the Shunt Resistor Selection section.
A transistor (the type depends on the load)
Two capacitors
LED load
5 V reference voltage
9 V to 27 V supply
Oscilloscope
Digital voltmeter (DVM)
Shunt Resistor Selection
The shunt resistor is chosen by the equation
LOAD
SHUNT
I
R
V
2
.
0
For example if the load is expected to be 500 mA, the shunt
value should be equal to or less than 0.4 Ω. This keeps the
output of the current sense amplifier from being greater than
4.8 V in normal operation to prevent noise from causing the
output to latch off.
Circuit Configuration
Connect the pass transistor, capacitors, and LED load(s) as
shown in Figure 3. It is important to note that the value of CM
should be at least 22 nF to ensure circuit stability.
The LED lamp should be configured to expect 12 V. This is
the result of selecting the series/parallel combinations of LEDs
and series resistors. The series resistors can be used to adjust
for LED supplier brightness variations from lot to lot.
Connect 5 V to Pin 2 (5 V reference) and at least 9 V to Pin 5
(VPLUS). It may be necessary to raise the VPLUS voltage to more
than 13 V, depending on the drop across the pass transistor, for
the output to be regulated at 12 V. This varies according to the
application and the pass transistor type.
.
CL
47nF
R1
350k
R2
250k
LATCH-OFF
DRIVER
RSENSE
10k
GND
1
2
3
4
5
7
6
8
VO
VSENSE
5V
REFERENCE
PWM
VPLUS
BASE
SHUNT
VBATT
CM
22nF
RSHUNT
Figure 3. Connections for Typical Applications


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