Hiper minimum load
The Hiper data sheet say 10% minimum load.
My LCD inverter has an inverter enable. The inverter enable may not be valid if I have not applied power to the inverter yet.
But I can't have Hiper power on to the inverter unless I have a 10% load so I don't trip the hiper OVP.
Is there any wasy around this without having a power wasting dummy load?
Comments
Yes, enable is coming from an independant source. But my concern is I will be sending an enable signal to an Inverter with no power. So when I apply power (from the Hiper) it may not be enabled. So the Hiper will see no load and the OVP latch will kick in.
Not sure I fully understand your control logic. The standby converter needs to fully bias Hiper controler before an enable is allowed to turn on Hiper converter. Also, the enable logic you provide needs to know that AC input is stable and within allowable operating range before Hiper is actually turned on via the enable line.
All the logic you specify is there.
The problem is with the minimum load the Hiper reference design requires.
An LCD backlight inverter the hiper refernce design is powering has an enable signal of its own.
LCD backlight inverter enable is required to be disabled until video is stable so as not to see artifacts.
Then LCD backlight inverter enable is enabled to turn opn the backlight.
However the Hiper reference design output 24 V must see at least a 10% load to not go into OVP shutdown.
So I am concerned about LCD backlight enable being recognized by the inverter logic when it has no power.
That is why I feel I need to put in a 10% dummy laod and waste power.
My question is there any way to not require the 10% minimum laod of the Hiper reference design?
The enable should be sourced from a standby converter which allows the main converter to be totally off and yet still have control bias. Do you have a seperatestandby converter in your design?