U10: Intersil ISL6255HRZ Integrated battery charger with automatic power source selector for laptops.
U2, U1 : Fairchild FDS4435BZ P-channel MOSFET (connector control on circuit)
U42: Fairchild FDS6298 N-Channel MOSFET (Vcore-Hi CPU)
U39: Fairchild FDS6676AS MOSFET N-Channel (CPU Vcore-Low)
C437: SMD ceramic capacitor, not less than 25v
The circuit of U2 and U1 is not exactly similar to what appeared in the test circuit of the ISL6255 data sheet. This is more similar to the circuit in the case of TI bq24751 except that the exhaustion and source are reversed.
Connector - > S-U2-D - > D-U1-S - > SYSTEM
Frame - > D-U42-S - > Vcore - > D-U39-S - > weight
U42-D - > C437 - > U39-S (Ground SYSTEM for U42+U39)
The frame is 19v from the connector or 11v from the battery.
I have this PC for profit. It powers any power source in the outage. A short film should be easy enough for me to get to work. Since my first workstation motherboard required more than a power outlet, I didn't recognize what to look for. I assumed that if I pulled enough coins, I would find out the problem.
The power connectors are simply short and close, so I add power from the seat to the power outlet and increase the voltage. At around 1.1v 1 ampere, the primary U2 in-line MOSFET warms up. She tried not to be short-circuited, but rather to warm herself up, so she went out. At that time, I put the control power supply from the seat to the failed circuit point by U2 and U1 warms up. It goes on and on. Each MOSFET on lines U2, U1, U39 and U42 warms up and exits. All DCA55 tests except U42 which was devastated during the evacuation. The shorts are still there and this time C437 is warming up. The C437 comes out and the shorts are gone.
At the moment, everything bodes well. U42 and U39 probably did not warm up since the current for C437 does not know them. C437 is directly among them and I expected the MOSFETs to get hot, not the top. U2 and U1 heated up because they were legitimately working and trying to provide a short circuit.
I got an FDS6298 swap for U42 and pulled a top shot from a comparable area on a terrible board and the workstation works. Another electronic device was spared by the residue receptacle.
It's a terrible summit, but finding it isn't quite the same as finding terrible electrolytes.
Thursday, August 23, 2018
Tuesday, August 14, 2018
How does SPW47N60C3 POWER MOSFET work?
could someone help me solve this problem?
I have to drive a Power mosfet SPW47N60C3 for 600V, 47 An and it has an input capacity of about 12 nF.
The recurrence exchange should be 200 kHz and with a short rise and fall time (about 50 ns). Everything is on the top driver's side and must be fast. I will use the appropriate optocoupler if it is as well for the pilot on the low side.
Would you be able to give me a correct sign for the driver?
To evaluate the exchange speed, Qgd emits more than Ciss. Qgd is frequently called the Miller door todeplete load since it is the input load required when the no-load voltage of the MOSFET oscillates from completely on to off (or back). This refers to figure 11 of the data sheet, and is shown as an average of 121nC, which is not terrible for a high voltage FET of 415W. Adept's adaptation of a similar piece includes "Low Miller Capacitance" on the first page of the fact sheet.
The load equation tells us that you will need I = Q/t = 121/50 = 2.4A door drive to switch this part in 50ns. I keep a combination of FET driver chips to process FETs of different sizes. For example, the TC4427 is a double conductor rated at 1.5A, the TC4424 is a double 3A and the TC4420 is a single conductor 6A. Yet I would suggest section 6A for your huge FET. I would use a small input resistance of 1.5 ohms and keep the FET conductors to the short door wires. Keep the path from the source to the driver's GND handle short and instantly parallel to the inductance of the door prompt limit. Similar jacks for the 0.1uF shot at by bypassing the IC driver.
I would start my tests at low voltage and without load. I would evaluate the input and source voltages by changing to check the nature of my FET-druve low inductance wiring. For example, I would run the high side FET with its opto-coupler, but without the 400V on its exhaustion, and without the low side switch. Indeed, I would ground the source of the FET (to maintain the gate and source voltages within the range for my degree) and I would use a short resistive load to HV. I would have the FET beat for short heartbeats (to avoid overheating the resistance) and deliberately measure the lead inductance peaks, which will increase as the heap current develops. Finally, I would use an inductive load to evaluate high current destruction peaks.
I have to drive a Power mosfet SPW47N60C3 for 600V, 47 An and it has an input capacity of about 12 nF.
The recurrence exchange should be 200 kHz and with a short rise and fall time (about 50 ns). Everything is on the top driver's side and must be fast. I will use the appropriate optocoupler if it is as well for the pilot on the low side.
Would you be able to give me a correct sign for the driver?
To evaluate the exchange speed, Qgd emits more than Ciss. Qgd is frequently called the Miller door todeplete load since it is the input load required when the no-load voltage of the MOSFET oscillates from completely on to off (or back). This refers to figure 11 of the data sheet, and is shown as an average of 121nC, which is not terrible for a high voltage FET of 415W. Adept's adaptation of a similar piece includes "Low Miller Capacitance" on the first page of the fact sheet.
The load equation tells us that you will need I = Q/t = 121/50 = 2.4A door drive to switch this part in 50ns. I keep a combination of FET driver chips to process FETs of different sizes. For example, the TC4427 is a double conductor rated at 1.5A, the TC4424 is a double 3A and the TC4420 is a single conductor 6A. Yet I would suggest section 6A for your huge FET. I would use a small input resistance of 1.5 ohms and keep the FET conductors to the short door wires. Keep the path from the source to the driver's GND handle short and instantly parallel to the inductance of the door prompt limit. Similar jacks for the 0.1uF shot at by bypassing the IC driver.
I would start my tests at low voltage and without load. I would evaluate the input and source voltages by changing to check the nature of my FET-druve low inductance wiring. For example, I would run the high side FET with its opto-coupler, but without the 400V on its exhaustion, and without the low side switch. Indeed, I would ground the source of the FET (to maintain the gate and source voltages within the range for my degree) and I would use a short resistive load to HV. I would have the FET beat for short heartbeats (to avoid overheating the resistance) and deliberately measure the lead inductance peaks, which will increase as the heap current develops. Finally, I would use an inductive load to evaluate high current destruction peaks.
Tuesday, August 7, 2018
Issue for my designed board with W5300
I designed my board with W5300 which worked with FPGA Spartan 6. I draw the diagram as the reference diagram of W5300, I just used the connector HR911105A RJ45 with an internal transformer from the company HANRUN, instead of the reference connector RJ45 "RD1-125BAG1A". I draw my circuit board with all the details refer to the W5300 documents.
My problems are:
1. when I have attached the W5300 it consumes 220mA that I think it is not normal, also the W300 will be hot.
2.as you see in the diagram when I remove 3.3VA current drop to 70mA and W5300 will not be hot.
3.when I receive PING from a PC, it does not recognize any Ethernet hardware.
When I connect a cable to the RJ45 connector, the RJ45 LEDs start flashing.
5. I checked that the schematic and PCB values are compatible, especially ON DNP parts like pin 1.8vo.
6. I checked all the power grids again. Everyone's OK.
7. I checked the Rsensens value which was 12.3K.
8. I checked the clock for a 25MHz oscillation. The test mode is'0000'. When the cable is connected to the card, the crystal does not work! But when I disconnect the cable, the Crystal works with a frequency of 25MHz with 100mV Peak-to-Peak and 0.9 volts DC offset.
9. I checked the Link LED when I connect the cable, it will light up, and the ACT LED starts flashing erratically.
in the schematic, I used crystal and oscillator, but I just welded crystal.
I'm really confused, any help would be greatly appreciated.
I do not use an oscillator, it is optional but I used 1.8 volts for its supply voltage.
if all my patterns are true, why isn't it working?
The dissipated power of the W5300 is 180(Typ)~250mA(Max).
And here's my comment on your diagram.
When using an oscillator in internal PHY mode, be sure to use a 1.8V level oscillator and connect it only to XTLP(Pin 96).
Otherwise, I don't see any problem.
Please check the reset time if at least 2uSec after power up.
My problems are:
1. when I have attached the W5300 it consumes 220mA that I think it is not normal, also the W300 will be hot.
2.as you see in the diagram when I remove 3.3VA current drop to 70mA and W5300 will not be hot.
3.when I receive PING from a PC, it does not recognize any Ethernet hardware.
When I connect a cable to the RJ45 connector, the RJ45 LEDs start flashing.
5. I checked that the schematic and PCB values are compatible, especially ON DNP parts like pin 1.8vo.
6. I checked all the power grids again. Everyone's OK.
7. I checked the Rsensens value which was 12.3K.
8. I checked the clock for a 25MHz oscillation. The test mode is'0000'. When the cable is connected to the card, the crystal does not work! But when I disconnect the cable, the Crystal works with a frequency of 25MHz with 100mV Peak-to-Peak and 0.9 volts DC offset.
9. I checked the Link LED when I connect the cable, it will light up, and the ACT LED starts flashing erratically.
in the schematic, I used crystal and oscillator, but I just welded crystal.
I'm really confused, any help would be greatly appreciated.
I do not use an oscillator, it is optional but I used 1.8 volts for its supply voltage.
if all my patterns are true, why isn't it working?
The dissipated power of the W5300 is 180(Typ)~250mA(Max).
And here's my comment on your diagram.
When using an oscillator in internal PHY mode, be sure to use a 1.8V level oscillator and connect it only to XTLP(Pin 96).
Otherwise, I don't see any problem.
Please check the reset time if at least 2uSec after power up.
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