Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

What is the maximum dimming ratio achievable with TLD5099EP?

What is the maximum dimming ratio achievable with TLD5099EP?

IFX_Publisher1
Community Manager
Community Manager
Community Manager
250 sign-ins First comment on KBA 250 replies posted

What is the maximum dimming ratio achievable with TLD5099EP?

The dimming ratio (called also contrast ratio) is the ratio between the PWM period and the minimum duty time manageable by the DC-DC.

In order to perform dimming without color shift, digital dimming has to be used. 

The minimum PWM frequency to avoid flickering is 50 Hz (--> 20 ms period time). The minimum duty time for TLD5099EP is tPWMI,H = 6 us. Then the contrast ratio is 20*10-3/(6*10-6):1 --> 3333:1

See the section "Enable and dimming function" in the datasheet of TLD5099EP

0 Likes
64 Views
Contributors