Problem
I'm working on a project which requires the ability to fully control (on/off and dimming) a single high power RGB LED via a USB interface. I need a surface mount driver that can run off 5V USB power and produce at least 350 mA of current per output channel*. Ideally, it should have a UART interface. However SPI and I2C are also fine if there are no UART options. If you can recommend a perfect part, that would be great. If not, please take a look at the solution I want to try out.
*USB can only supply 500mA, but the use case will assume the three channels will never be drawing 350mA simultaneously.
Possible Solution?
I currently have some TLC59116 chips which can only provide a maximum of 120mA per channel. However, each TLC59116 has 16 channels, so I'm wondering if I can tie groups of four channels to a single LED pin to increase the effective output current. For example, LEDR will be connected to LED0,LED1,LED2,LED3 on the same TLC59116 chip.
Is this safe? Will doing this scale the effective output current by 4?
