Questions tagged [quiescent]
The quiescent tag has no usage guidance.
34
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Best way to halve 12V battery voltage for 6V device, while still being able to measure the battery level?
I have a device that is powered by 4 AA (4x1.5V=6V) batteries, but I want to power it with a 12V battery.
The device measures its input voltage to determine the battery level. I only need to know if ...
- 377
1
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1
answer
71
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In a class A amplifier using a (BJT voltage divider bias) with no transformer coupling, how can one calculate the input DC current? [closed]
In a class A amplifier (using a BJT voltage divider bias) with no transformer coupling, how can one calculate the input DC current? The current drawn from the supply is ICQ (which flows in the ...
- 21
0
votes
1
answer
103
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What is the quiescent current in a current limiting voltage regulator circuit?
Is the quiescent current simply the current drawn by Q1 and Rin when no load is connected to the output? How would this differ from the supply current?
- 21
0
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1
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Can I calculate beta by using the quiescent point and a voltage divider?
How can I calculate beta with only the data in the image?
Q is the quiescent point. I've tried with the basics Vcc formulas, but since it doesn't provide any value for Vcc I could not proceed.
- 3
2
votes
1
answer
72
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Low-power high-range current monitoring
I'm working on a power circuit for a device that is usually battery powered.
Most of the time, the device is sleeping and sipping at power around ~5uA, which is great for battery life. In this state, ...
- 671
0
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1
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185
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LDO - Need more current: build a discrete regulator?
I'm working on a battery-powered device using an ESP32. It needs 3.3v, and my battery is Li-Ion, so I've got 4.2-3.5ish (of useful voltage, anyway) - so max dropout has to be around 200mV. Most of ...
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139
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UPS for battery with minimum quiescent current
I am powering a PIR sensor which has minimum 3.4V of VCC and 70µA supply current with parallel Li-ion batteries and I want to switch on a boost converter when battery voltage goes below 3.5V. But the ...
- 663
2
votes
2
answers
352
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Low quiescent current boost converter for battery application (Io < 200 μA)
I am designing a PIR sensor alarm. It must be able to run on batteries for about a year. I am using 3.7 V Li-ion batteries to power an ATtiny24 directly. Although my PIR senor needs 5 V as recommended,...
- 663
1
vote
2
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227
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How to control/remove "quiescent current" of UniversalOpamp2
In the circuit below, I get a quiescent current (entering positive supply and leaving negative supply of the op amp) of about 497 µA, while the load current is only 5 µA. I am aware that this ...
- 22.5k
2
votes
3
answers
721
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Reducing quiescent current of MOSFET pullup/pulldown
I have a device which will run off a 2.7-60V power source. The voltage may go up to 80V during surges.
I have a couple of input protection circuits which use N or P channel MOSFETs and require pullups ...
0
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0
answers
463
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Meaning of Input Leakage Current vs Shutdown Current and Quiescent Current
I am looking at an IC load switch that has values for Quiescent Current, Shutdown Current, and Leakage Current. My understanding is that Quiescent Current is current drawn by the IC in the "on&...
- 137
1
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0
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37
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MMA8452 high quiescent current consumption
I have designed a PCB where I am using the MMA8452Q accelerometer.
Because it is a battery powered device, we want to ensure that we are using the lowest sleep current states of all the components on ...
- 25
0
votes
0
answers
109
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Output Stage Stability
I've been reading over amplifier output stage design and hoped someone might be able to advise if my circuit has any fundamental flaws - or if there are any tweaks I should make that would bring ...
- 307
1
vote
1
answer
2k
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Supply current vs quiescent current
I'm currently making a power/current consumption budget. Is there a difference between the quiescent current and supply current? I know the quiescent current is the current that when there is no load ...
- 11
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1
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48
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quiescent current opamp and R feedback
I have an opamp and would like to keep it in class A output. The rule of thumb is 1/2 of quiescent current should not be taken by the load. (to keep it in class A)
The load itself is a R feedback (...
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