KCC's Quizzes AQQ304 - A pure logic
1. Quote of the month: "I am not lazy, I'm just in energy-saving mode" - unknown
2. Quiz AQQ304 about finding a pure logic puzzle
Mike is looking at Anne, but Anne is looking at Paul.
Mike is married, but Paul is not.
Question:
Is a married
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September Monthly Blog Quiz! Read the blog, take the quiz, and you could win a gift card
Quiz: How Well Do You Know Adaptive Power Switching?
Is your I/O module overheating? The AD74416H's Adaptive Power Switching (APS) can cut heat dissipation by up to 40% — but how well do you really understand how it works?
Read the blog first: Cooling
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LTM2887
Production
The LTM2887 is a complete galvanic digital μModule® (micromodule) isolator. No external components are required. A single 3.3V or 5V supply powers both...
Datasheet
LTM2887 on Analog.com
Hi Team
My understanding is that AVL2 and AVCC2 are the ADJ pins.
On page 4 of the datasheet, the ADJ pin voltage for Vcc2 and Vl2 is 580mV.
However, on page 17, ADJ pin voltage is calculated as 0.6V.
Which is correct?
Best Regards,
Koji
Hello Koji,
Both values are correct.
You correctly understand that AVL2 and AVCC2 are adjustment pins for the internal LDO's supplying the associated outputs. In particular, this means that they are the feedback inputs for the LDO's error amplifier. The LDO's error amplifier's reference level is 0.6V. Using standard design practice, the feedback network gain (voltage divider ratio) is set to produce a 0.6V feedback input to the amplifier when the output is at the desired voltage (zero error). Hence the design equations on page 17 use 0.6V.
The values in the electrical characteristics table on page 4 provide a measured range of possible values for this voltage over different loading and operating conditions and part variations. The typical value of 0.58V reflects the LDO's output voltage droop from a loading current of 100mA. Note that this feedback voltage would correspond to an output voltage of approximately 4.83V which is within the LDO's 5% output regulation specification listed in the LTM2887's data sheet (4.75-5.25V).
Eric
Hi Eric,
Thank you for quick response.
I thought that the output voltage was 5V even when ADJ=0.58V.
I now understand that when it is 0.58V, the output voltage is approximately 4.83V.
Best Regards,
Koji
