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AMC7150 Datasheet(PDF) 4 Page - ADDtek Corp

Part # AMC7150
Description  1.5A POWER LED DRIVER
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Manufacturer  ADDTEK [ADDtek Corp]
Direct Link  https://www.addmtek.com
Logo ADDTEK - ADDtek Corp

AMC7150 Datasheet(HTML) 4 Page - ADDtek Corp

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AMC7150
Copyright
© 2006 ADDtek Corp.
4
DD034_A
--
JUNE 2006
APPLICATION INFORMATION
Low Voltage DC/DC Application
The AMC7150 was designed for power LED driving application. Only 5 external components were required for
low voltage application. Fig.1 shows the typical application circuit for input voltage range from 4V to 40V. Buck power
conversion topology was used and total forward voltage (at expecting current) of the LED string should lower than
supply voltage by 1.6V at least.
AMC7150
CS
OUT
OSC
VCC
GND
Rsense
CT
CIN
DF
L
4V~40V
Input Bypass Capacitor
The input by-pass capacitor CIN holds the input voltage and filters out the switching noise of AMC7150.
Flywheel Diode
The fast recovery diode was recommended for flywheel diode DF. This is because the high reverse recovery
current will cause the voltage drop across Rsense being higher than 330mV, and consequently the switch will be turned
off which has just been turned on.
LED Driving Current
The peak current IPK flow though LEDs was decided by:
Rsense
mV
I
PK
330
=
The average current on LEDs was determined by the peak-to-peak ripple current that was decided by inductor L.
Assume the target average current 550mA on LEDs and ripple current 100mA then the Rsense should be:
=
+
=
55
.
0
100
5
.
0
550
330
mA
mA
mV
Rsense
The Rsense value should higher than 200mΩ so that driving current won’t over the recommended maximum driving
current 1.5A.


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