Part Number: TPS61169
Hello guys,
One of my customers is considering using TPS61169 for their next products. They will use the device for a light source of CCD camera. So they want to use analog dimming mode (LED current control) not digital dimming mode (LED on/off duty control) to avoid flickering in camera image. I think TPS61169 has analog dimming mode which can be controlled by CTRL signal duty ratio.
The customer has a few questions about the analog dimming mode as the follows.
Q1. Their conditions are Vin = 5V, Vout (LED VF) = 6V, ILED(max) = 300mA.
What is the minimum CTRL duty ratio which can control ILED correctly. Is it 10% (=30mA)? Or 1%(=3mA)? or more less?
Q2. Do you have any graph, ILED current (Y axis) vs CTRL signal duty ratio (X axis)?
Q3. Is ILED compleately zero when CTRL=0% (Low Level continuously)?
Your reply would be much appreciated.
Best regards,
Kazuya.