(ams AG) offers full range flash led driver portfolio
2013-01-17
Since 2005, ams AG (SIX: AMS) has been releasing high-performance flash led driver ICs to enhance better picture quality on mobile devices. Picture quality is the key marketing feature for new smartphones and tablet PCs that are hitting the shelf. In complement to increased phone camera resolution and wide field angle, multi-step photo flash and photo flash consistency are the most critical criteria in flash led driver selection. Below illustration shows the difference between good and poor photo flash design.
 |
Poor
Better
It is easy to see that multi-steps flash led current setting is required for objects in different distances from camera. Finer current resolution setting enables better picture quality.
Below is another illustration on photo flash consistency.
 |
Photo flash consistency can be actuated by consistency of each time the current flowing through flash led. ams flash led driver AS3647 is acclaimed for its high current accuracy +/-5% at 1.5A. It is best affordable quality in smartphone and tablet PC’s price range.
ams flash led driver portfolio up to date
 |
AS3647 Application:
Smartphone
Tablet PC
PDA
AS3647 Quick Features:
Photo flash current programmable from 3mA to 1.6A, given 256 steps resolution.
Photo flash current accuracy achieves within +/-5%.
I2C interface. Single wire enable for indicator mode, torch mode, and flash mode.
Auto flash current reduction and under-voltage lock out are programmable for battery monitor function.
Over-temperature protection, over-voltage protection, and short circuit protection.
Can drive either 2 leds jointly at 1.6A or 1 led.
Application efficiency > 80% when driving at 1A, Vin = 2.8V~4.2V.
Application efficiency near 85% when driving at 300mA, Vin = 2.8V~4.2V.
4MHz DC-DC switching allows inductor as small as 1uH for compact system size.
To learn more about ams flash led driver, contact Opto-Sensor at:
