ON Semiconductor's NCP5603 - a white LED driver designed to drive high brightness LEDs in torch or flash applications for camera phones and other portable uses, provides power conversion by means of a charge pump structure, using two external ceramic capacitors. This eliminates the need for a bulky inductor. Offered in a DFN-10 package (3 x 3 x 0,9 mm), it can supply a constant voltage to the load from battery voltage ranges between 2,7 to 5,5 V. It operates at up to 90% efficiency thanks to the automatic operating modes of 1X, 1,5X and 2X. Because the device allows a high output current pulse of up to 350 mA, it is suitable to drive a high brightness 1 W power LED. The device also features a PWM/EN input, suitable for dimming requirements. It can also function as a low cost, small boost dc-dc converter that supplies a constant voltage of either 4,5 V or 5 V in applications such as biasing audio amplifier in cellphones, MP3 players or digital still cameras where space is at a premium.
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Altron is celebrating its 60th birthday by honouring Johannesburg’s heritage and encouraging business, government and civil society to come together and respond to our President’s call to rebuild Johannesburg.
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Editor's Choice Circuit & System Protection
A simple and small solution for driving an LED to provide visual feedback in the presence/absence of a system’s power using a chip not originally designed for this purpose.
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