AMC7150DL ADDTEK [ADDtek Corp], AMC7150DL Datasheet - Page 4

• Manufacturer Part Number: AMC7150DL
• Description: 1.5A POWER LED DRIVER
• Manufacturer: ADDTEK [ADDtek Corp]

Low Voltage DC/DC Application
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.
Input Bypass Capacitor
Flywheel Diode
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 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:
The Rsense value should higher than 200mΩ so that driving current won’t over the recommended maximum driving
current 1.5A.
Copyright © 2006 ADDtek Corp.
The input by-pass capacitor C
The peak current I
The AMC7150 was designed for power LED driving application. Only 5 external components were required for
The fast recovery diode was recommended for flywheel diode D
PK
flow though LEDs was decided by:
4V~40V
C
IN
IN
Rsense
holds the input voltage and filters out the switching noise of AMC7150.
C
T
APPLICATION INFORMATION
=
550
OSC
VCC
mA
I
Rsense
PK
AMC7150
330
+
=
0
4
GND
mV
5 .
CS
330
Rsense
⋅
100
mV
mA
OUT
F
=
. This is because the high reverse recovery
. 0
55
D
Ω
F
L
DD034_A -- JUNE 2006
AMC7150