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Can POL devices work without a bleeder resistor on the output?
Hello@vikas, It's always recommended to use a bleeder of 100 ohms. Vout of the part has an offset of around 250mV due to a leakage in no-load condition. The 100-ohm bleeder will pull it down. If there's no issue with 250mV offset the part can be used without bleeder also. If there's a concern with eRead more
Hellovikas Nagpal,
It’s always recommended to use a bleeder of 100 ohms.
Vout of the part has an offset of around 250mV due to a leakage in no-load condition.
The 100-ohm bleeder will pull it down.
If there’s no issue with 250mV offset the part can be used without bleeder also.
If there’s a concern with effectiveness while using a 100-ohm bleeder also a 500-ohm bleeder can be used. 500-ohm bleeder will have an offset of 65mV.
Regards,
Ashish Gawade
See lessSMPS Necessary or Not?
Hello, The SMPS reduces the power loss when VDD is regulated down to the core voltage with an internal LDO. The SMPS, thus, increases energy effectiveness. However, you're better off with the LDO version because you have further GPIOs and one lower coil and capacitor on the BOM, If you do not need tRead more
Hello,
The SMPS reduces the power loss when VDD is regulated down to the core voltage with an internal LDO. The SMPS, thus, increases energy effectiveness.
However, you’re better off with the LDO version because you have further GPIOs and one lower coil and capacitor on the BOM, If you do not need to save every milliwatt.
Does it answer your question?
Regards
See lessHow to do Binary Core Programming?
Hello Ashish, No, sorry, that kind of setup is physically impossible on current ESP chips as the two cores( and the main memory, for that matter) are in the same timer domain. Thank you
Hello Ashish,
No, sorry, that kind of setup is physically impossible on current ESP chips as the two cores( and the main memory, for that matter) are in the same timer domain.
Thank you
See lessHow to use RA2A1 MCU at 5V Power Supply?
Hello, None RA2 family can run from 1.6 V to 5V. The data sheet & hardware user manual that can be found on the Renesas web give further detail. Thank You
Hello, None RA2 family can run from 1.6 V to 5V.
The data sheet & hardware user manual that can be found on the Renesas web give further detail.
Thank You
See lessTLE987X Emulated EEPROM?
Hi @nidhi, As the sample code is for TLE9879QXA40 and you're applying TLE9872QTW40 so please make the following changes- Please go to Options for Target in Keil also- 1) Go to the Device menu and add your device TLE9872QTW40 also uncheck the BF stepping to make the code compatible with your device.Read more
Hi nidhi singh,
As the sample code is for TLE9879QXA40 and you’re applying TLE9872QTW40 so please make the following changes-
Please go to Options for Target in Keil also-
1) Go to the Device menu and add your device TLE9872QTW40 also uncheck the BF stepping to make the code compatible with your device.
Go to Debug menu-> Settings-> Flash Download and confirm if TLE9872QTW40 with 252k size is selected.
2) Now open the config wizard, go to PMU-> Power Saving Modes, select Sleep mode, and save it.
3) Rebuild your project and check page 0 with address 0x1103F000.
Best Regards
See lessAlex Thomas
STM32WB55 IR DA Hardware Setup?
Hello, IrDA has hardly been used for a long time, which is also marked in discontinued IrDA transceivers. However, since basically everything except the TIA and visual factors is included in the STM32 IrDA SIR ENDEC, it's possible to recreate IrDA with an IR LED plus driver transistor and an IR photRead more
Hello,
IrDA has hardly been used for a long time, which is also marked in discontinued IrDA transceivers. However, since basically everything except the TIA and visual factors is included in the STM32 IrDA SIR ENDEC, it’s possible to recreate IrDA with
RX and TX are switched to the IrDA function so that the LED driver and TIA can be connected directly.
Regards
Julian White
See lessESP32-C3 first programming via USB?
It's not required per se, but it's helpful. The issue is that an empty ESP32-C3 usually will try to boot from flash and fail. After some attempts, the RTC watchdog will protest in to reset the entire chip. This is useful as it may clear any transient error that would stop a properly flashed chip froRead more
It’s not required per se, but it’s helpful. The issue is that an empty ESP32-C3 usually will try to boot from flash and fail. After some attempts, the RTC watchdog will protest in to reset the entire chip. This is useful as it may clear any transient error that would stop a properly flashed chip from booting. However, it also resets the USB-serial- JTAG device, causing the OS tore-enumerate it. Going into download mode (either by pulling low GPIO9 or by successfully connecting using the flashing app) stops that from passing, allowing the chip to be flashed as normal.
Not having GPIO9 accessible will generally work (depending on how fast your OS is in detecting USB devices) but may need several tries in flashing for the timing to be right.
Another thing is that without forcing the chip into download mode, for old performances of the esp tool, a watchdog will keep running during the flashing process, which may interrupt flashing if the firmware is fairly large. Using a newer version of the esp tool should fix that, however.)
See lessIs switching in MCUBoot is Atomic?
Hi Alex, The exchange mode for MCU boot uses the scratch area as an intermediate area in order to complete the exchange of the 2 images. The process of switching is done like below. However, then no information is lost, If a power failure occurs. The scratch area must be large enough to store the laRead more
Hi Alex,
The exchange mode for MCU boot uses the scratch area as an intermediate area in order to complete the exchange of the 2 images. The process of switching is done like below. However, then no information is lost, If a power failure occurs.
The scratch area must be large enough to store the largest sector that’s going to be shifted. For RA2 MCUs, the scratch area should be set up to 0x800 when exchange mode is used.
Regards
Nidhi Singh
See lessLow Frequency DC to AC Transformer Design?
Hi, Thank you for posting on the Volt.Tech community. Can you please share a detailed block diagram of the Inverter system? Is it the same as the below-attached block? This operation note from Infineon depicts a sample figure for a low-frequency converter. Regards, Julian
Hi,
Thank you for posting on the Volt.Tech community.
Can you please share a detailed block diagram of the Inverter system?
Is it the same as the below-attached block?
This operation note from Infineon depicts a sample figure for a low-frequency converter.
Regards,
Julian
See lessWhat’s the SKU for LD2981ABM50TR?
Hello, The labeling looks ok F130 = LD2981ABM30TR F133 = LD2981ABM33TR F150 = LD2981ABM50TR So there's a good chance that the LD2981ABM50TR is similar to these devices in SOT23- 5L package. However, please label this thread as answered by selecting Select as best, as also explained here, If the probRead more
Hello,
The labeling looks ok
F130 = LD2981ABM30TR
F133 = LD2981ABM33TR
F150 = LD2981ABM50TR
So there’s a good chance that the LD2981ABM50TR is similar to these devices in SOT23- 5L package.
However, please label this thread as answered by selecting Select as best, as also explained here, If the problem is answered. This will help other users find that answer faster.
Regards
See less