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• Nch Jfet
• 2.5v Drive Nch Mosfet
• Mosfet Nch Pch
• 4v Drive Nch Mosfet
• Dual N Ch Mosfet

This is one of the MOSFET types.

Toshiba MOSFET gate driver ICs are very small Nch FET driver with built-in boost circuit and protection circuit. Using with MOSFET, it's possible to design small, low loss ideal power supply circuit. Parametric Search SiC MOSFETs Toshiba’s 1200V SiC MOSFET offers high-speed switching and low ON-resistance making it excellent for high-power. SiC 650 V MOSFET are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for SiC 650 V MOSFET.

This is a kind of the transistor.

Part Number : MDU1514

Function : 30V, 66.3A, 6.0mΩ MOSFET

Package : Power DFN56 Type

Manufactures : MagnaChip Semiconductor

Image

Decription

The device uses advanced MagnaChip’s MOSFET Technology, which provides high performance in on-state resistance, fast switching performance and excellent quality. MDU1514 is suitable device for DC/DC Converter and general purpose applications.

MDU1514 Pinout

Features

1. VDS = 30V
2. ID = 66.3A @VGS = 10V
3. RDS(ON)
< 6.0 mΩ @VGS = 10V
< 9.0 mΩ @VGS = 4.5V
4. 100% UIL Tested
5. 100% Rg Tested Ootp baseball reddit.

Absolute Maximum Ratings (Ta = 25oC)

1. Drain-Source Voltage : VDSS = 30 V
2. Gate-Source Voltage : VGSS = ±20 V

Ordering Information

MDU1514URH -55~150oC PowerDFN56 Tape & Reel 3000 units Halogen Free

MDU1514 Datasheet

Related articles across the web

H-bridge using N channel FETs

Theory of Operation

by Eugene Blanchard

The problem that most people run into when using N channel MOSFETs forH-bridges is that the MOSFET used to turn on and off the positive power supplyvoltage, Vcc, will not work. This is the MOSFET which sits between the motorand Vcc. Hku sophos download.

The reason it does not work, is that a MOSFET is a voltage controlled device(transconductance). A voltage on the input (gate-source) controls a current onthe output (drain-source). The voltage on the gate must be above the thresholdvoltage (4.5 to 7 volts) of the MOSFET in order for the MOSFET to turn on.

The problems with N channel MOSFETs

Here lies the problem. The MOSFET's drain lead is connected to Vcc. The goalis to turn the MOSFET on such that the top of the motor is at Vcc potential.This means that the MOSFET's source lead will be raised to Vcc's potential. BUTwe need the gate to be 4.5 to 7V higher than the source to keep the MOSFETturned on and we only have Vcc to work from! We need a gate voltage that ishigher than Vcc by 4.5 to 7 V!

Voltage Doublers!

A higher voltage can be accomplished by using a voltage doubler circuit togenerate a voltage that is larger than Vcc. The chip that I selected is theIntersil 7662 negative voltage source which can be used as a voltage doubleralso. It is easy to use, small (8 pin DIP) and inexpensive. The ICL7662providesabout 5 mA of output which is more than sufficient to drive the MOSFETs. It isgood for a Vcc up to +18V or so while its sister chip the ICL7660 is only goodfor a Vcc up to +10V.

How does it do that?

The components C2, D1, D2 and C3 of Figure 2 make up the voltage doublingcircuit. Basically, the ICL7662 voltage doubler is an oscillator that keepsswitching pin 2 from ground to Vcc and back again (See Figure 2). To start thecycle, pin 2 is internally switched to ground. This charges up C2 by thefollowing path: Vcc to D1 to C2 to pin 2. C2 charges up to Vcc minus thevoltagedrop across D1 which is roughly 0.7V or so. Across C2 there will be (Vcc-0.7)Volts

When ICL7662 switches again, pin 2 goes to Vcc but C2 has a full charge onit (Vcc - 0.7V). This means that the anode of D2 is now Vcc from pin 2 PLUS thecharge of C2. The voltage on C2 is elevated above Vcc!

Diode D2 dumps the charge into C3. C3 now has a charge that is equal to Vccfrom pin 2 plus the charge on C2 MINUS the voltage drop across D2 (0.7V or so).C3 has Vcc + Vcc-0.7V - 0.7V on it which is 2xVcc - 1.4V.

The voltage loss across the diodes can be minimized by using germanium(0.3V) diodes or schottkey (0.25) diodes. The frequency of operation of theICL7662 is 10 kHz at room temperature.

Bonus - Negative voltage source!

In addition to being a voltagedoubler, the ICL7662 is a negative voltage source (actually that's its mainpurpose - we're just not using it right ;-) . If you don't need a low-powernegative voltage source, you can leave capacitor C4 and diode D3 off thecircuit.

The capacitors C1 and C4 and diode D3 make up the negative voltage source.Basically, the ICL7662 voltage doubler is an oscillator that keeps switchingpin2 from ground to Vcc and back again and at the same time switches pin 4 fromground to pin 5 (See Figure 2). To start the cycle, pin 2 is internallyswitched to Vcc and pin 4 is switched to ground. This charges up C1 to Vcc withthe positive side of the charge connected to pin 2 (very important).

Next, pin 2 is internally connected to ground and pin 4 is internallyconnected to pin 5. The positive charge on C1 is connected to ground (notshorted - only connected). The capacitor has been electronically turned upsidedown! This places the negative plate of C1 at pin 4 which results in a negativeVcc onto pin 5.

Pin 5 is connected to diode D3 which dumps the negative Vcc into C4. Thecharge on C4 is -Vcc minus the voltage drop across diode D3 which results in-(Vcc-0.7V) across C4.

Figure 1(Rev 01- 10k) is a schematic of the N channel H-bridge discussed here.Figure 2- (2.6k) is a schematic of a simpleinexpensive voltage doubler circuit. Both are GIF files that can be opened byany Web Browser.

MOSFETs are extremely static sensitive but more important is that if theGate is left open (no connection), the MOSFET can self- destruct. The Gate is avery high impedance device (10+ megohms) and noise can trigger the MOSFET.Resistors R4, R6, R8 & R13 of Figure 1 have been added specifically to stopthe MOSFET from self destructing. It is very important to install theseresistors FIRST before installing the MOSFETs. You will find that after theseresistors are installed that the MOSFETs are quite stable devices. Theresistorspull-down the Gates and turn off the MOSFETs, not to mention add some staticprotection.

Back EMF protection

D1 to D4 route back EMF from the motor back to the power supply. Some MOSFETs(actually most) have these diodes built-in, so they may not be necessary.

Control Transistors

Q1 & Q7 are NPN transistors that invert the control signals to Q2 andQ8. Q2 & Q8 are PNP transistors that control Q3 and Q5 respectively.

Looking at Q1 and Q2 operation only, we can see that a High at A will turnon Q1. This allows current to flow from Q2's base. This turns on Q2 and raisesthe Gate voltage of Q3 to +24V. Q3 turns on.

When point A goes low, Q1 turns off, which turns off Q2 and Q3's gate ispulled to ground by R4. Q3 turns off. Q7, Q8 and Q5 operation is similar.

Nch Jfet

The circuit could of been made simpler by by using only a NPN transistor topull down Q3's gate except that should something happen to Q1 or Q7 (failure),the FETs would be turned on. The extra transistors provide a'failsafe'mode of operation.

STOP Mode

When A=0 and B=0, the motor is stopped. R4 and R13 pull down the Gates of Q3and Q5 respectively and turn off the MOSFETs.

REVERSE Mode

When A=0 and B=1 (+5V), the motor is in reverse. Q1 is turned off, Q2 isturnedoff and Q3 is turned off due to R4.

Q7 is turned on by the voltage at B. Q7's collector pulls Q8's Base toground. This turns on Q8 which raises Q5's gate to +24V. This turns on Q5. The-ve side of the motor is raised to +12V. R5 raises Q4'ss Gate to +11V or so(voltage divider) which turns on Q4. Q4's Drain goes to ground which makes the+ve side of the motor go to ground. R7 is also connected to the +ve side ofthemotor which pulls down Q6's Gate and makes sure that it is turned off. Thecurrent path for the motor is from +12V to Q5 to -ve contact to +ve contact toQ4 to ground.

FORWARD Mode

When A=1 and B=0, the motor is in forward. Q7 is turned off, Q8 is turned offand Q5 is turned off due to R13.

Q1 is turned on due to the voltage at A and Q1's collector goes to ground.This turns on Q2. Q2's collector raises the Q3's gate to +24V which turns onQ3.Q3 raises the motor's +ve side to +12V. R7 raises Q6's Gate voltage and turnsit on. When Q6 turns on, R5 makes sure that Q4 remains off. The current pathfor the motor is from +12V to Q3 to +ve contact to -ve contact to Q6 toground.

NOT ALLOWED Mode (or fuse testmode)

2.5v Drive Nch Mosfet

IF A=1 and B=1 then all MOSFETs turn on which shorts out the power supplyamong other things - Not recommended.

Miscellaneous Info

The tricolor LED allows you to test the circuit without connecting the motor.The LED will be green for one direction and red for the other. Handy test.

Mosfet Nch Pch

Motors make a lot of electrical noise from the brushes when running andhuge electrical spikes when stopping, starting and especially changingdirection. C1 and C2 try to suppress the noise spikes. Negative spikes areshorted to either ground or the power supply by D1 to D4. Z1 tries to clip thepositive spikes.

4v Drive Nch Mosfet

MOSFETs turn on very fast, if you have problems with noise, you may want toput 0.1 uF capacitors in parallel with R4 and R13 to slow the turn-on time.Thiswill reduce the EMF generated by the motors. If the rise time is too slow theMOSFETs may heat up excessively!

Try to keep the motor supply separate from the logic supply if possible orgo to extreme filtering techniques using coils, diodes and capacitors tofilterout the motor noise.

Dual N Ch Mosfet