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AMC7150 Datasheet(PDF) 4 Page - ADDtek Corp |
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AMC7150 Datasheet(HTML) 4 Page - ADDtek Corp |
4 / 7 page ![]() 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: Ω = ⋅ + = 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. |
Similar Part No. - AMC7150_1 |
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Similar Description - AMC7150_1 |
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