What is the maximum dimming ratio achievable with TLD5099EP?
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Nov 25, 2021
01:25 AM
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Nov 25, 2021
01:25 AM
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
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