Question asked by donadona999s on Feb 23, 2016
Latest reply on Mar 1, 2016 by donadona999s

Hi !

1)=================================================================

For DC-DC output voltage , the datasheet p3 says the condition is VDD1=5V.

And Setpoint : Viso Min = 4.7V , typ = 5V,Max = 5.4V.

Does this means

(A) if we input 5V , the output will change 4.7V~5.4V?

Or

(B) does this means if we input 4.5~5.5V , the output will change 4.7V~5.4V?

If (B) is correct, is it possible that if we input 4.5V, the output will be 4.7~5.4V?

===================================================================

2)=================================================================

For the Line regulation,  the value is 1mV/Vtyp .

Does this value means 1mV/V is 5V condition ?

For example

Vdd1=5.5V  ; 1mV*(5.5-5)=0.5mV

Vdd1=4.5V  ; 1mV*(4.5-5)=-0.5mV

Can you explain how to use this value?

===================================================================

3)=================================================================

At P7 of datasheet, the condition is "VDD1 = 4.5min~5.0typ~5.5Vmax.

But at Table10, Line regulation comments , it says VDD1=3.0~3.6V.

Is this typo?

Which is correct?

===================================================================

4)=================================================================

The datasheet says Load Regulation will change 5%.

・Viso=5Vtyp     ; 5×5%=0.25V      → Viso=5-0.25=4.75Vmin

・Viso=4.7Vtyp   ; 4.7×5%=0.235V   → Viso=4.7-0.235=4.465Vmin

Is my understanding are correct?

With question No.1 , the setpoint is just the target value so we have to take care about Load regulation too.

Is my understanding are correct?

===================================================================

5)=================================================================

At Figure21 & Figure22 it looks like At 1Mbps , Iiso = 0mA.

Does this means when the Frequency is lower than 1Mbps,　I can ignore it?

===================================================================

Best regards.

Kawa