About Zaim01

Zaim01 · 2024-07-07

Hello everyone,I'm working on a circuit for monitoring the bias voltage of a GM tube, which requires a high voltage of 100V. I am currently using a OA1NP22C op-amp configured as a unity-gain buffer to read the divided voltage. To minimize current con...

Zaim01 · 2024-05-23

Hello, I'm working on a project using the STM32L412RBT6P microcontroller, and I have a few questions regarding the use of the VDD12 pins to achieve the lowest possible power consumption. 1. Can I directly connect the two VDD12 pins to a 1.25V supply?...

Zaim01 · 2024-01-25

Hello ST Community,I am currently working on a project that involves the use of 2 LIR2450 Li-ion batteries. For the battery charging aspect, I am seeking recommendations for a suitable Power Management Integrated Circuit (PMIC) charger from ST.Specif...

Zaim01 · 2024-07-10

Hi,Actually, using a reed relay or permanent magnet relay would be a good option, but the available relays that can handle more than 120V with a 3V coil voltage are either very expensive or too large to fit into my device.Regarding high-value resisto...

Zaim01 · 2024-07-09

You mean a circuit like the one below:The issue with this circuit is the leakage of the MOSFET and the current consumption through R1. When increasing the value of R1, the P-MOSFET T1 may not turn off completely, and if R1 is too small, it could dra...

Zaim01 · 2024-07-09

Yes, I searched extensively for SSRs and found that the minimum off-state leakage current is around 100nA, which is comparable to the leakage current of the voltage divider itself. Therefore, using the divider without additional components may be the...

Zaim01 · 2024-07-09

Hi Barry,Thank you for your suggestion! Using a Solid-State Relay (SSR) could indeed be a viable alternative to using a FET for enabling and disabling the voltage divider in my application. I will get some samples and check their behaviors.

Zaim01 · 2024-07-07

Hi,You raise some good points. Since my voltage is 100V, I can't use a MOSFET with a Vds of 100V; it should have some margin, so at least 120V is necessary. I searched for a suitable MOSFET on Digi-Key but couldn't find one that meets these specifica...

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Minimizing Current Consumption in High Voltage Divider Circuit

Questions About Using VDD12 on STM32L412RBT6P for Lowest Power Consumption

PMIC Charger Recommendation for 2-cell Li-ion Battery (LIR2450) and Reference Design

Re: Minimizing Current Consumption in High Voltage Divider Circuit

Re: Minimizing Current Consumption in High Voltage Divider Circuit

Re: Minimizing Current Consumption in High Voltage Divider Circuit

Re: Minimizing Current Consumption in High Voltage Divider Circuit

Re: Minimizing Current Consumption in High Voltage Divider Circuit