I have a Top246YN in three terminal modes trying to determine if it works.
My setup:
48v power supply with 300mA capacity
LED and 10k resistor to test drain current.
47uF cap attached to control line and negative side to neutral.
10k and 100k series power supply pot for control.
Everything seems to work perfectly, the led lights up and when I increase the current to the control pin, the led goes out as if the work cycle was reduced. I look at the voltage of the control line and the shunt goes into action and keeps the line at ~5.8V. The problem is that even if I don't give the current of the control line, the thing still works. I even tried to add a tensile strength down. What do you think's going on? The reason why the IC was removed in the first place was that it did not appear to have a stable reversal. Any ideas?
The reason you see a 5.8V on the control pin is that there is an internal shunt regulator in the TOP246YN. As long as you put a voltage higher than 7V or more in the drainage pin, you will get 5.8V on the control pin. Details can be found in the Top with data sheet.
On the right, when the unit starts, the internal power supply loads the RC circuit at 5.8v to start the soft start. However, if no external feedback is applied before the RC circuit reaches 4.8v, an automatic restart will begin. The automatic start must then put the device into low power mode and attempt to restart the device at a frequency eight times higher than the RC time constant. My problem is that by testing the device as described above when no external feedback is applied, the device continues to work. I wonder if this could be caused by damage to the control spindle.
Yes, if there is no external feedback to the control pin, it means that it is an open loop. At 4.8 V, automatic restart is activated, disabling the output MOSFET and putting the control circuit into low-current sleep mode. The high voltage current source lights up and recharges the external capacity. An internal hysteresis undervoltage comparator keeps the VC within a 4.8V to a 5.8V window by turning the high voltage current source on and off.
Tuesday, July 31, 2018
Thursday, July 26, 2018
STM8S003F3U6TR, a cheap and fast EEPROMs alternative
I just went to check my shopping cart at DK and they didn't have much stock of the common 24LC256 EEPROMs I use so I looked around. It turns out that there are piles of one piece faster stock from 1MHz to 75% of the cost. So I changed my order, of course. The part is an FT24C256A-USR-T and costs 50cents in quantities of 250 and even better in quantities of 1K. They have about 15,000 in stock at present and although it is described as an "SOP" part, this is the standard width of 0.150" SOIC. All specifications are same or better than regular parts.
This also revitalized my interest in the fast EEPROM and the higher capabilities that bring me to the next device, the M24M01-RMN6TP, a fast 128KB EEPROM with an additional 256 bytes, a lockable ID page and a minimum endurance of 4 million cycles. In terms of bytes per dollar, it is tied with the cheap part of the FT and costs $2.10 to $250 off.
So I ordered 25 to play because I thought my Tachyon Forth could make good use of that extra capacity and speed without introducing extra chips. The source code can be edited, saved and loaded in this small space as well as the additional memory for all help functions where the comment and description of each fourth word in the stack can be referenced.
Now, that leads me to mention something: What happened with Holly's wonderful finds that we used to love?
With EEPROM, there is a price premium for endurance and fine writing. If you just need storage, try dropping W25Q into DK engine. Now you will find that 8M Bit of serial memory, is just 36c/250+ - even less than your 256kb device.
The very low cost of W25Q parts, raises the question of when it makes sense to use a small uC bridge, to let the Prop 1 boot from W25Q parts? - Such a bridge could either look like a serial host PC or an i2c slave chip. Which would be faster? There is also a C8051T606-GT in MSOP10, at 73c/100+, which could be used when the code is stable. Also new, without price indication, this new MSOP10 is this new device -[Vcc wider, Flash, and adds ADC on the T606].
STM8S003F3U6TR QFN20 ( ~44c/100+), it will be cheaper or similar in price to similar ST part.
This also revitalized my interest in the fast EEPROM and the higher capabilities that bring me to the next device, the M24M01-RMN6TP, a fast 128KB EEPROM with an additional 256 bytes, a lockable ID page and a minimum endurance of 4 million cycles. In terms of bytes per dollar, it is tied with the cheap part of the FT and costs $2.10 to $250 off.
So I ordered 25 to play because I thought my Tachyon Forth could make good use of that extra capacity and speed without introducing extra chips. The source code can be edited, saved and loaded in this small space as well as the additional memory for all help functions where the comment and description of each fourth word in the stack can be referenced.
Now, that leads me to mention something: What happened with Holly's wonderful finds that we used to love?
With EEPROM, there is a price premium for endurance and fine writing. If you just need storage, try dropping W25Q into DK engine. Now you will find that 8M Bit of serial memory, is just 36c/250+ - even less than your 256kb device.
The very low cost of W25Q parts, raises the question of when it makes sense to use a small uC bridge, to let the Prop 1 boot from W25Q parts? - Such a bridge could either look like a serial host PC or an i2c slave chip. Which would be faster? There is also a C8051T606-GT in MSOP10, at 73c/100+, which could be used when the code is stable. Also new, without price indication, this new MSOP10 is this new device -[Vcc wider, Flash, and adds ADC on the T606].
STM8S003F3U6TR QFN20 ( ~44c/100+), it will be cheaper or similar in price to similar ST part.
Wednesday, July 18, 2018
Alternative Mosfets working for brushed ESC
I'm constructing a brushed ESC that can be effectively arranged to have any present rating you want just by picking an alternate mosfet!
I at present make them work with the front just, I might want to make it fit for turning around too. I have a few thoughts on the best way to do this, however, I invite proposals.
I will show the source code document (written in C) and any updates and utilitarian HEX records.
Hobbyking offers a 1S Lipo 3amp ESC brushed mic that I have and it functions admirably. This ESC utilizes a lowercase13 and a mosfet. I drew a graph for the HK ESC and I will go along with him to this position. It is on this premise I base my underlying endeavors.
From the chart, I comprehended that the PWM engine presumably utilizes the main equipment PWM unit in lowercase13 (stick 5, OC0A) and that the servo PWM input utilizes either the PCINT on stick 2 or perhaps the ADC yet it's most likely a standard IO port and everything is done in code.
I am at present utilizing PORTB3(pin2) for the info and OC0A(pin5) for the PWM yield to the mosfet.
Legitimate level mosfets must be utilized on the off chance that you drive them specifically with the microcontroller, else they won't illuminate totally!
Clarification: Regular N-ch mosfets pivot the distance when the door achieves 10 volts, legitimate level mosfets turn the distance within the vicinity of 2 and 5 volts on the entryway relying upon the mosfet. ATtiny and ATmega microcontrollers can't transmit up to 5 volts on their pins and less if their supply voltage is under 5 volts as though you are utilizing a 1 cell lipo, so, utilize a rationale level mosfet.
(cheap) Mosfets that should work correctly: (can be found on HQEW by looking up the part number)
SO-8 :
FDS6570A 15A, 20V (would be very good for a single-cell ESC as if the power-on resistance were lower than the single-cell voltage).
FDS6680A 12.5 A, 30 V
IRF7821 13.6A, 30V
FDS8813 18.5A, 30V
TO-252 (DPAK) :
FDD8447L 50A, 40V
IRL3502S 110A, 20V
I at present make them work with the front just, I might want to make it fit for turning around too. I have a few thoughts on the best way to do this, however, I invite proposals.
I will show the source code document (written in C) and any updates and utilitarian HEX records.
Hobbyking offers a 1S Lipo 3amp ESC brushed mic that I have and it functions admirably. This ESC utilizes a lowercase13 and a mosfet. I drew a graph for the HK ESC and I will go along with him to this position. It is on this premise I base my underlying endeavors.
From the chart, I comprehended that the PWM engine presumably utilizes the main equipment PWM unit in lowercase13 (stick 5, OC0A) and that the servo PWM input utilizes either the PCINT on stick 2 or perhaps the ADC yet it's most likely a standard IO port and everything is done in code.
I am at present utilizing PORTB3(pin2) for the info and OC0A(pin5) for the PWM yield to the mosfet.
Legitimate level mosfets must be utilized on the off chance that you drive them specifically with the microcontroller, else they won't illuminate totally!
Clarification: Regular N-ch mosfets pivot the distance when the door achieves 10 volts, legitimate level mosfets turn the distance within the vicinity of 2 and 5 volts on the entryway relying upon the mosfet. ATtiny and ATmega microcontrollers can't transmit up to 5 volts on their pins and less if their supply voltage is under 5 volts as though you are utilizing a 1 cell lipo, so, utilize a rationale level mosfet.
(cheap) Mosfets that should work correctly: (can be found on HQEW by looking up the part number)
SO-8 :
FDS6570A 15A, 20V (would be very good for a single-cell ESC as if the power-on resistance were lower than the single-cell voltage).
FDS6680A 12.5 A, 30 V
IRF7821 13.6A, 30V
FDS8813 18.5A, 30V
TO-252 (DPAK) :
FDD8447L 50A, 40V
IRL3502S 110A, 20V
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