Questions tagged [negative-voltage]
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171 questions
0 votes
0 answers
69 views
LM2596 Negative Power Supply Abnormal
This is my circuit topology. When I connect the wires first and then turn on the DC power supply, it displays (2V 0.7A), but I set the output voltage to 24V. When I turn on the power first and then ...
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1 vote
1 answer
74 views
TD1509PR positive and negative power supply design
I am using the TD1509PR chip, and its manual is here The design of the picture below is the positive power supply: The design of the picture below is the negative power supply: I would like to know ...
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0 votes
3 answers
139 views
How to block negative pulse coming from high-pass filter? Proteus
I'm simulating a circuit in Proteus where have a button connected to a high-pass filter, so that if someone pressed the button for a very short period of time or someone kept the it pressed, in both ...
0 votes
0 answers
45 views
Enable on negative voltage protection circuit
I have a circuit that uses the TPS2394 IC for -15V protection, and it seems that I've ran into a timing issue. I need +15V to be present before the TPS2394 enables the -15V output. The IC doesn't have ...
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1 vote
2 answers
155 views
How to create an active high-pass filter (with an op amp) that has configurable gain (without changing cutoff frequency)?
I use the following circuit to create an active high pass filter (with an op amp) and apply some gain on a input signal : EDIT : as stated by KFW, my previous circuit picture was showing an inverting ...
- 1,999
0 votes
1 answer
56 views
Negative Voltage Generation Using MAX1681
for a waveform generating project I need to invert 5V to produce -5V. After some research, I have found that this can be done using the MAX1681 IC. There is even an example in its datasheet: In my ...
2 votes
2 answers
121 views
Schematic Designed | What drawbacks to consider?
I am trying to design my own circuit that takes two sensor output voltages and finds their difference. I created an LTSpice schematic to model this situation: purple box = two noisy sensor voltage ...
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5 votes
2 answers
506 views
Can a positive LDO be used as a negative LDO?
For typical designs that need a positive and negative supply rail, it seems common to use different parts which are a positive regulator (LDO) and negative regulator. Is it possible to use a positive ...
- 3,958
1 vote
1 answer
94 views
Positive-Negative Voltage PWM Driver Design
I've noticed the following positive-negative PWM driver circuit in the OpenEVSE project. This circuit converts 5V CMOS-level PWM signal input (marked "PWM_IN") into a signal that swings ...
- 413
4 votes
3 answers
414 views
How to Get Negative Voltage with Virtual Ground for Differential OpAmp? (One power supply)
I am reading about working with virtual ground and generating negative voltage. I am trying to power a differential op amp circuit, and I expect some of these differences to result in a Vout that is ...
- 117
2 votes
2 answers
195 views
Converting the output of LT8292 to negative value
I want to design a variable output DC-DC converter to convert 12V to -1V to -20V at 4A, would you please let me know if I can make changes on the following schematic to achieve this (LT8292)? If not ...
- 1,438
3 votes
4 answers
424 views
NMOS based negative load switch schematic
I designed this switch to supply negative a -12 V, 2 A to Rload, based on IPB072N15N3 G NMOS. The 3.3 V control signal to the FODM8801C optocoupler is provided by a microcontroller. Reverse current ...
- 315
0 votes
4 answers
195 views
Designing a variable negative output voltage converter with low ripple
I want to design a variable output regulator to convert 12V to -10V to 0V @1.5A. My idea is to convert 12V to -10V using an LTC7149: I have 40mV ripple at 1.5A. I need to reduce this ripple as much ...
- 1,438
0 votes
1 answer
187 views
Optimal setup for ±15V dual rail power supply from USB-C
I have a decent +15V power supply design from USB-C, however I also need a low noise stable -15V supply. What approach would be optimal to convert +15V to -15V, or +16V to -16V to a -15V LDO? It's for ...
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-1 votes
1 answer
146 views
Converting a digital (0, +5 volt) signal to (+30, -30 volt) signal using mosfets [closed]
I'm trying to convert 0, 5 V signal to +30, -30 V using MOSFETs, the signal is generated by a microcontroller, but I haven't got any idea so far on how to convert it, The +30 -30 voltages are ready (...
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