TLC59108: How to decrease power consumption when standby condition?

Hi Statham,

One possible way to reduce standby power consumption is turn off the internal oscillator, which is in the bit4 of register 00h. Using hardware reset also achieve the same effect, that resets the OSC bit to 1 and turn off the oscillator.

Hello Hardy:

We had been tried by I2C command to run off OSC bit.

But OSC bit is 1 in default setting, it means after I2C commend that power consumption has no change.

Can you let me know how much the lowest power consumption is?

Please help to provide your recommendations for us.

Thanks a lot.

Hi Statham,

In my understanding the 17mA Icc supply current is based on normal operation, which means oscillator is turned on. I can provide a test result for you in the next week, since I am on business trip now. Since it is an old device, no other power saving function is integrated. Could you help to share your system requirements for LED driver, maybe some new generation device could be recommended with lower power consumption.

Hi Hardy:

Please refer the requirements as below.

Any recommendations please let us know.

Thanks a lot.

1. per channel current support to 120mA

2. I2C interface

3. IC height should be lower than 1mm

4. sleep power consumption should be under 10uA

5. support over 8 channel

Hi Hardy, 

This is Serialsystem FAE Michael, we tried to turn off the oscillator but only benefit around 2mA....

below are our requirements.

1. IC package same as tlc59108 or similar

2. support at least 8 or more

2. Support LED output current per channel > 70 mA

3. Support power saving in sleep mode (uA level)

Hi Hardy:

About LP5861, if we want to use MODE 1 and don't use VSYNC pin what should we do on this pin?

Please help to provide your recommendations for us.

Thanks a lot.