MATCHING MOSFET DRIVERS MOSFETs AN-30 INTRODUCTION TelC

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MATCHING MOSFET DRIVERS MOSFETs AN-30 INTRODUCTION TelC

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MATCHING MOSFET DRIVERS MOSFETs
MATCHING MOSFET DRIVERS MOSFETs
AN-30
INTRODUCTION
TelCom offers many sizes MOSFET drivers. This allows designer best match switching performance driver/MOSFET application.
MOSFET SIZES
Unlike bipolar transistors which size primarily function current, MOSFETs have sizes that function both current voltage.
INPUT
TC4424
SIZE EFFECT GATE CAPACITANCE
expected, larger size, larger effective gate capacitance. illustration this, look through manufacturer's data book relate size CRSS will find that size determines both these parameters, voltage current rating device.
Figure Resistor Limit Peak Current
DRIVER FAMILIES
There several families TelCom CMOS drivers. most common are: TC1426/4426 TC4467/4468/4469 TC4423/4424/4425 TC4420/4429 TC4421/4422 TC426 world's first CMOS MOSFET driver. dual output device capable 1.5A 18V. came other versions, dual non-inverting TC427 driver, inverting plus non-inverting TC428 driver. TC4426 family second generation family, through improved processing design less propagation delay, latch-up problems driving inductive loads, draws half power first generation. These improvements have been incorporated into drivers with four numeric digits part number.
TC4424
INPUT
Figure Typical Drive Circuit
industry has, general, adopted International Rectifier's size description technique. Instead referring "mils side" describe size, they have used simple numeric indicators through Thus, smallest die, while largest standard MOSFET offerings. Some other manufacturers (IXYS), offering sizes large Parallel-MOSFET modules even larger.
TC4426
PEAK CURRENT REQUIREMENTS
view driving function terms peak current required obtain required rise time application view capacitance thus size). From [(dV)xC]/I determine trade-offs driving circuit. optimum rise time application based many requirements, such EMI, heat dissipation, lead/circuit inductance, etc. Thus, there universal driver that fits applications.
AN30-2
Figure Zener Diode Clamp Voltage Long Output Lead
MATCHING MOSFET DRIVERS MOSFETs AN-30
TYPICAL APPLICATIONS
+12V TYPICAL CIRCUIT WITH LARGE TRACE/LEAD INDUCTANCE +12V 2.2-22
SIMPLE, DIRECT DRIVER
+12V TC170 CMOS
+300V
IRF450
TC4427
FORWARD CONVERTER WITH TC4427 DRIVING UPPER LOWER FETs
Another important improvement second generation families their ability have input signal below negative rail much This guaranteed parameter very useful systems where control circuit ground closely tied power source ground MOSFET. These grounds often move relative another. TC1426 special, low-cost version family that latch-up resistant does have below-rail protection input. good choice large volume OEMs. Following same part numbering pattern 1.5A TC426 family, TC4423 family dual drivers output capacity. TC4424 dual non-inverting driver TC4425 inverting plus noninverting driver. TC4429 single inverting driver (like predecessor TC429), while TC4420 non-inverting.
This family drive capability 18V. TC4429 slew 10,000 load table following page shows performance various drivers under production test methods. characteristics drivers more fully described their individual data sheets. This table intended only guide comparing specifications. Refer individual data sheets more complete information. following families power drivers made with CMOS process interface between low-level control functions high-power switching devices, particularly power MOSFETs. devices also optimum choice capacitive drivers where 1.2A-9A switched. With both inverting non-inverting inputs available, logic signals either polarity accepted.
MATCHING MOSFET DRIVERS MOSFETs AN-30
Selecting MOSFET Drivers Rise Time Rated Load (ns) Fall Time Rated Load (ns) Rising Edge Prop. Delay (ns) Falling Edge Prop. Delay (ns) Input Protected Latchto Below Proof Rail
Device TC1426 TC1427 TC1428 TC4426 TC4427 TC4428 TC4423 TC4424 TC4425 TC4420 TC4429 TC4421 TC4422 TC4469 TC4468 TC4467
Drive Current (Peak) 1.2A 1.2A 1.2A 1.5A 1.5A 1.5A 3.0A 3.0A 3.0A 6.0A 6.0A 9.0A 9.0A 1.2A 1.2A 1.2A
Rated Load Inverting Non-Invert. (pF) Dual 1000 Dual 1000 Single Single 1000 Dual 1000 Dual 1000 Single Single 1000 Dual 2200 Dual 2200 Single Single 2200 Single Non-invert 4700 Single Inverting 4700 Single 10,000 Single 10,000 Quad 1000 Quad 1000 Quad NAND 1000
Output Number Type
MOSFET Size Suggested Drive Family MOSFET Size Parallel Modules Size (mm) 0.89 1.09 1.75 2.41 3.40 2.21 4.44 2.79 7.04 4.32 6.45 6.45 Various Total MOSFET (pF) 1500 3000 6000 12,000 15,000 16,000 48,000 Suggested Driver Family 12V) TC1426/4426/4469 TC1426/4426/4469 TC1426/4426/4469 TC1426/4426 TC4423 TC4423 TC4429/4420 TC4429/4420 TC4421/4422 Faster Rise/Fall Times
TC4423 TC4423 TC4429 TC4429 TC4421/4422 TC4421/4422
CONCLUSIONS
match MOSFET proper driver, chart above (which will take care largest number applications), simple formula: rise time (dt) driver supply voltage (dV), times capacitance (C), divided driver peak current (I); restated: [(dV)xC]/I need drive power MOSFET, there TelCom driver job.
Printed U.S.A. 3/30/95
MATCHING MOSFET DRIVERS MOSFETs AN-30
Sales Offices
TelCom Semiconductor 1300 Terra Bella Avenue P.O. 7267 Mountain View, 94039-7267 TEL: 650-968-9241 FAX: 650-967-1590 E-Mail: liter@c2smtp.telcom-semi.com TelCom Semiconductor Austin Product Center 9101 Burnet Suite Austin, 78758 TEL: 512-873-7100 FAX: 512-873-8236 TelCom Semiconductor H.K. Ltd. Chuk Street, Ground Floor Kong, Kowloon Hong Kong TEL: 852-2324-0122 FAX: 852-2354-9957
Printed U.S.A. 9/5/95

MATCHING MOSFET DRIVERS MOSFETs AN-30 INTRODUCTION TelC

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