New answers tagged voltage-regulator
0
votes
How to calculate the base current of the transistors in this voltage regulator?
Trying to do a DC analysis is going to be difficult because there are active devices and feedback involved.
The base current is going to be whatever it takes to cause the current through the load to ...
- 12.3k
3
votes
Accepted
Do I need to use a voltage regulator or an overpower protection
You don't need either because you want to power a boost converter from the output of this. It makes no sense to reduce 12V down to 5V and then up to 18V - just convert it directly to 18V.
Switching ...
- 10.6k
1
vote
Accepted
Minimum and maximum input voltage for boost converter for reliable operation
From what I understand from the schematics given on p.2 of the schematic, it's 0.9V for 3.3V output, and 3V for 5V output.
And the datasheet defines a start-up voltage of 0.82V but the related note ...
- 24k
1
vote
Minimum and maximum input voltage for boost converter for reliable operation
Here is the start up conditions ...
And here is :
Maximum input voltage <= Vout < 5.5V
- 10k
1
vote
Minimum voltage power supply
You can use a boost converter to convert the varying input voltage to a stable (i.e. 12V) output voltage. There are a lot of ready-made modules you can buy.
This of course won't work if the voltage ...
- 13.3k
1
vote
RT9080-33 LDO voltage regulator: enable chip with +5 V and GND
You have not mentioned how much is BATT+ voltage range. I assume it is say 4.2V typical.
In the case where device is not charging and when jumper is not connected to GND. Here you want EN to be 0V ...
- 1,223
2
votes
Accepted
Module with LM7815 and LM7915 voltage regulators has 3 pins for input and output - why?
It has two voltage regulators on board, and can handle two input voltages, positive and negative plus common ground, and has two outputs, one for the +15 V, one for the -15 V, plus common ground. The ...
- 8,455
1
vote
Module with LM7815 and LM7915 voltage regulators has 3 pins for input and output - why?
It needs positive, negative and common ground input to regulate positive and negative output in relation to the common ground output.
- 114k
6
votes
Accepted
LM317 output too low
Based on the resistor values, there should be 0.4V on ADJ pin which you have, and there should be 1.65V on OUT pin, which you have.
The circuit works as per the schematics. The resistors are just ...
- 114k
0
votes
Power Distribution
the regulator L7805 is a three terminal positive voltage regulator, it can provide output current up to 1.5 A. You also should add some filter capacitors in the input and the output of the IC.
The ...
- 17
4
votes
Accepted
What is the simplest way to adjust the input voltage for a linear regulator?
I would cut the trace after the MB6S's positive terminal and replace it with a 15V zener, like this:
This way, the input cap will 'see' around 19V, which would be in spec.
- 5,104
3
votes
Accepted
Is there any voltage regulation on this board from an Apple Trackpad teardown?
Yes; circled in red below.
At least three, including one most likely onboard the Broadcom chip, as you note.
Regulators are fairly easy to spot as they are almost always paired with inductors -- ...
- 14k
0
votes
Accepted
How to use the "Sense Function" of RT9080?
A regulator senses its output voltage and then uses that signal to regulate voltage. The sense pin is used to sense the output voltage:
(Taken from the datasheet)
If you buy the version with the ...
- 13k
0
votes
Full form of LEB in VIPer01 block diagram
Leading edge blanking is used especially on current sense analog inputs where during the switching event, there will be some parasitics in your circuit, mainly stray inductance and semiconductor ...
- 10.6k
1
vote
Accepted
Is this way of maximum current calculation correct for this voltage regulator?
The reason for the 500mA rated current is actually much simpler than that: The chip has an integrated current limit that may be as low as 600mA depending on tolerances (typically 800mA). Even if the ...
- 13.3k
1
vote
Regulator output voltage drop in high temperature
The EN6360QI regulator itself is rated for 85 °C, so that should not be an issue if these are genuine EN6360QI parts.
Some things to consider:
Is the supply voltage within spec's (2.5 - 6 VDC)?
Are ...
- 3,278
2
votes
Accepted
Safe Operating Area
If you look at the bottom axis of that chart you see that at a \$V_{in}-V_{out}\$ of 7 V and \$T_A\$ of \$85^\circ C\$ the current is around 1/4 A, so a 2 A load at that voltage is not okay by the ...
- 12.3k
0
votes
Buck converter (MAX5035D) regulation problem
Here's my ideas on the matter:
The inductor value is too small. The equation calls for 44uH at least
vin=[15 25 31]; vout = 10
((vin-vout).vout./vin)/(0.32*125e3)
ans =
4.4444e-05 8.0000e-05 9....
- 72.6k
7
votes
LM317 voltage regulator varying voltage output depending on the load
Others have pointed out that your values for R102 and R103 are far too large. One of the purposes of R102, besides setting the adjustment pin potential, is to draw current from the LM317's output, ...
- 16.9k
6
votes
LM317 voltage regulator varying voltage output depending on the load
As pointed in the other answer (and now done), reducing R102 to the recommended 220Ω (and R103+R104 in proportion) can improve things. Other ideas:
Make sure the wiring resistance from VOUT to load ...
- 1,238
7
votes
LM317 voltage regulator varying voltage output depending on the load
All regulators have varying output voltage due to varying output current. It is hard to say how much in your circuit the current varies, and for the LM317L the change could be 1.5% over full ...
- 114k
0
votes
Which voltage regulator should I choose to power STM32 + 4G module + GPS with low consumption when they're in stand by?
I powered two ESP32 + SIM808 + RF module + DS3231 in my project by CN3903 3A dcdc.
This one is step down from 36-5 V to 3.3 V. Work's fine for me.
- 1
0
votes
How to get a constant 5 V power supply when using the same power supply for motors and micro controllers
There are several possible causes.
The current loop formed by the batteries and motors is a big electromagnet. Every time motor current rises or falls, that loop's changing magnetic field couples to ...
- 16.9k
7
votes
Accepted
How can I make this regulator output 2.8 V or 1.5 V?
We'll need a schematic to help:
simulate this circuit – Schematic created using CircuitLab
On page 6 of the datasheet you linked to, we are given a value for "minimum load current", ...
- 16.9k
Top 50 recent answers are included
Related Tags
voltage-regulator × 3185power-supply × 544
voltage × 455
power × 180
batteries × 167
dc-dc-converter × 158
switch-mode-power-supply × 157
linear-regulator × 139
zener × 135
arduino × 130
buck × 130
capacitor × 125
ldo × 119
current × 108
switching-regulator × 108
operational-amplifier × 100
diodes × 100
transistors × 97
voltage-divider × 89
lm317 × 84
microcontroller × 81
dc × 78
boost × 75
mosfet × 73
led × 68