Linear Technology DC102 Guida rapida alla configurazione

DEMO MANUAL DC102

50V N-CHANNEL HALF BRIDGE

LT1336 Half-Bridge N-Channel

Power MOSFET Driver

with Boost/Flyback Regulator

ESCRIPTIO

ThisdemonstrationcircuitisanN-channelhalf-bridgefor

generalpurposeapplications.Thehalf-bridgecanbedriven

with TTL/CMOS level signals into an LT

1336, which

drives the N-channel MOSFETs. A self-contained high-

sidedriverregulatorallowsPWMoperationto100%duty

cyclewithoutdiscontinuities.ByaddingacontrollerICand

some other components in the space provided for

prototyping, this demo board can be turned into a com-

plete system solution. The half-bridge consists of four

power MOSFETs, two paralleled topside MOSFETs and

two paralleled bottom side MOSFETs.

, LTC and LT are registered trademarks of Linear Technology Corporation.

PERFORMANCE SUMMARY

UWWW

SYMBOL PARAMETER CONDITION VALUE

LT1336 Input Voltage Range 10V to 15V

LT1336 Typical Supply Current INTOP = INBOTTOM = 0V 15mA

HV High Voltage Range 0V to 50V (60V Abs Max)

DS(ON)

Power MOSFETs R

DS(ON)

= 10V 0.09Ω

ESR ESR of Bypass Capacitor 100kHz 0.03Ω

Max Ripple Current 4.5A

Max Power Input (Note 1) 150W

MAX

Max Operating Frequency 100kHz

Operating Temperature Range 0°C to 50°C, VIN = 12V unless otherwise noted.

Note 1: For applications requiring higher input power, attach heat sinks to all power MOSFETs.

Demo Board with a Flyback High-Side Driver Regulator Demo Board with a Boost High-Side Driver Regulator

BOARD PHOTOS

DEMO MANUAL DC102

50V N-CHANNEL HALF BRIDGE

PACKAGE AND SCHEMATIC DIAGRAMS

UWW

C3 TO C8

330µF

63V 

× 6

Q2

MTP50N06V

Q4

MTP50N06V

Q3

MTP50N06V

R5

10Ω

1/4W

R3

10Ω

1/4W

R6, 10Ω

1/4W

Q1

MTP50N06V

R4

10Ω

1/4W

C2

1µF

25V

E2

OUT

E1

HV

0V TO 40V

D1

1N4148

SENSE

INTOP

INBOTTOM

UVOUT

SGND

PGND

BGATEFB

SWGND

BOOST

TGATEDR

TGATEFB

TSOURCE

BGATEDR

U1

LT1336

BOLD LINES INDICATE HIGH CURRENT PATHS

* SUMIDA RCH-664D-221 KC

DM102A • F02

E4

UVOUT

E5

INTOP

E3

IN

10V TO 15V

E6

INBOTTOM

E7

GND

R2

2Ω

1/4W

L1*

200µH

R1, 24k

1/4W, 5%

C1

10µF

25V

D2

1N4148

D5

1N5819

L1 REPLACES THE DASHED 

COMPONENTS IN FIGURE 1

Figure 2. Demonstration Circuit with a Boost High-Side Driver Regulator

C3 TO C8

330µF

63V 

× 6

Q2

MTP50N06V

Q4

MTP50N06V

Q3

MTP50N06V

R5

10Ω

1/4W

R3

10Ω

1/4W

R6

10Ω

1/4W

Q1

MTP50N06V

R4

10Ω

1/4W

C2

1µF

25V

E2

OUT

E1

HV

0V TO 50V

D1

1N4148

SENSE

INTOP

INBOTTOM

UVOUT

SGND

PGND

BGATEFB

SWGND

BOOST

TGATEDR

TGATEFB

TSOURCE

BGATEDR

U1

LT1336

*T1 = CTX100-1P

BOLD LINES INDICATE

HIGH CURRENT PATHS

FOR BOOST TOPOLOGY REPLACE COMPONENTS IN DASHED AREA WITH THE INDUCTOR AS SHOWN IN FIGURE 2

DM102A • F01

D5

1N5819

T1*

D3

1N4148

R7

6.2k

1/4W

C9

1000pF

25V

D2

1N4148

R2,2Ω

1/4W, 5%

C11

0.1µF

50V

R1

24k

1/4W

C1

10µF

25V

E4

UVOUT

E5

INTOP

E6

INBOTTOM

E7

GND

E3



10V TO 15V



Figure 1. Demonstration Circuit with a Flyback HIgh-Side Driver Regulator

LT1336CN

TOP VIEW

SENSE



INTOP

INBOTTOM

UVOUT

SGND

PGND

BGATEFB

SW

SWGND

BOOST

TGATEDR

TGATEFB

TSOURCE



BGATEDR

N PACKAGE

16-LEAD PDIP

DEMO MANUAL DC102

50V N-CHANNEL HALF BRIDGE

PA SLIST

REFERENCE

DESIGNATOR QUANTITY PART NUMBER DESCRIPTION VENDOR TELEPHONE

C1 1 25SC10M 10µF 25V 20% Electrolytic Capacitor Sanyo (619) 661-6835

C2 1 25SC1M 1µF 25V 20% Electrolytic Capacitor Sanyo (619) 661-6835

C3 to C8 6 63MV330CZ 330µF 63V Aluminum Capacitor Sanyo (619) 661-6835

C9 1 FKC02 1000pF 25V 10% Mylar Capacitor WIMA (914) 347-2474

C10 1 25SC10M Option Capacitor Sanyo (619) 661-6835

C11 1 MKS2 0.1µF 63V 5% Mylar Capacitor WIMA (914) 347-2474

D1 to D3 3 1N4148 Diode Philips (800) 774-4547

D5 1 1N5819 Diode Motorola (602) 244-3576

L1 1 RCR-664D-221KC 0.99Ω0.30A Inductor (Optional) Sumida (847) 956-0666

Q1 to Q4 4 MTP50N06V 50A 60V TO-220 MOSFET Motorola (602) 244-3576

R1 to R7 7 1/4W 5% Resistor Any

T1 1 CTX100-1P Transformer Coiltronics (407) 241-7876

U1 1 LT1336 IC LTC (408) 432-1900

QUICK START GUIDE

Demonstration board 102 is easily set up for evaluation

ofthe LT1336IC. Pleasefollow theprocedure belowfor

error-free operation.

• ConnectthepositiveleadofalowpowersupplytoV

(E3) and the negative lead to GND (E7). The voltage

range of this supply must be between 10V – 15V.

• ConnectthepositiveleadofahighpowersupplytoHV

(E1) and the negative lead to GND (E7). The recom-

mended maximum operating voltage is 50V. The

capacitors, the MOSFETs and the IC are rated at 60V

absolute maximum.

• Connect the driving signals into INTOP (E5) and

INBOTTOM (E6). Taking INTOP high and INBOTTOM

low turns the top MOSFETs on and the bottom

MOSFETsoff.TakingINTOPlowandINBOTTOMhigh

reverses these states. When both inputs are either

highorlow,alltheMOSFETsareoff.Theseinputsare

TTL/CMOS compatible and can withstand input volt-

ages as high as V

• Connect the load between OUT (E2) and GND (E7).

OPERATION

A general purpose half-bridge is implemented using the

LT1336. Figure 1 is the schematic for this demonstration

board.Thehalf-bridgecanbeused as abuilding block for

anumberofdifferentapplications,includingsynchronous

switching regulators, motor control and class-D amplifi-

ers. By adding the appropriate controller IC in the

prototyping space, a complete system solution can be

created.

This demonstration unit is intended for the evaluation of

the LT1336 half-bridge driver and was not designed for

any other purpose.

To power this demo board, connect a low power 10V to

15VsupplytoV

(E3)andahighpowersupply,upto50V

toHV(E1).ToevaluatetheLT1336drivingthehalf-bridge,

connect two complementary signals from a function

DEMO MANUAL DC102

50V N-CHANNEL HALF BRIDGE

OPERATION

generator to INTOP (E5) and INBOTTOM (E6). These

inputs to the LT1336 are TTL/CMOS compatible and can

withstand input voltages as high as V

. Both driver

channelsarenoninverting.TheinternallogicoftheLT1336

prevents the top MOSFETs and bottom MOSFETs from

turningonsimultaneouslyunderanyinputconditions.For

instance, when both inputs are high both outputs are

actively held low.

The LT1336 incorporates a small switching regulator to

chargethefloatinghigh-sidedriversupplyabovethehigh

voltage rail. This regulator can provide enough charge to

thefloatingsupplycapacitortoallowthetopdrivertodrive

several power MOSFETs in parallel at 100kHz, its maxi-

mum operating frequency. The regulator voltage across

BOOST

– V

TSOURCE

is 10.6V. Unlike bootstrapping tech-

niques with internal charge pumps, the built-in regulator

enables the half-bridge to operate from PWM to DC

without discontinuities.

In conventional half-bridge drivers using bootstrapping

techniques and internal charge pumps, approaching DC

may cause some serious problems. When the duty cycle

approaches 100%, the output pulse width becomes too

narrowforthefloatingcapacitortorecharge.Thiscapaci-

tor is being continuously depleted by the gate charging

currentsofthetopMOSFETs.Theinternalchargepumpis

too weak to provide the currents needed to replenish the

–

SENSE

INTOP

INBOTTOM

BOOST

TRIP = 10.6V

TRIP = 8.7V

16 SW

SWGND

TGATEDR

TGATEFB

T SOURCE

BGATEDR

DC102 FD

SGND

PGND

BIAS

TOP UV

DETECT

BOTTOM

UV LOCK

2.9V

2.5V

480mV

UVOUT

–

BGATEFB 8

Functional Diagram for the LT1336

DEMO MANUAL DC102

50V N-CHANNEL HALF BRIDGE

OPERATION

floating capacitor. Thus, at a point between 90% and

100% duty cycles, the floating capacitor will be depleted,

causing a discontinuity and potential overdissipation of

the top MOSFETs.

In this demo board the built-in switching regulator of the

LT1336 comes configured as a flyback regulator, as

shown in Figure 1. To configure a flyback regulator, a

resistor,adiode,asmall1:1turnsratiotransformeranda

capacitor are needed. The maximum voltage across the

switch, assuming an ideal transformer, will be about

+11.3V.Leakageinductanceinnonidealtransformers

will induce an overvoltage spike at the switch the instant

that it opens. These spikes are clamped using the snub-

bing network D3, C9 and R7. Using the components as

showninFigure1,theflybackregulatorwillrunataround

800kHz.Tolowerthefrequency,increasethevalueofC11;

to raise the frequency, decrease the value of C11.

Theflybackregulatorworksasfollows:whentheswitchis

on, the primary current ramps up as the magnetic field

buildsup.Themagneticfieldinthecoreinducesavoltage

onthesecondarywindingequaltoV

.However,nopower

is transferred to V

BOOST

because the rectifier diode D1 is

reverse biased. The energy is stored in the transformer’s

magneticfield.Whentheprimaryinductorpeakcurrentis

reached, the switch is turned off. Energy is no longer

transferredtothetransformer,causingthemagneticfield

tocollapse.Thecollapsingmagneticfieldinducesachange

involtage across the transformer’s windings.During this

transition the Switch pin’s voltage flies to 10.6V plus a

diodeaboveV

,thesecondaryforwardbiasestherectifier

diode D1 and the transformer’s energy is transferred to

BOOST

. Meanwhile, the primary inductor current goes to

zeroandthevoltageatI

SENSE

decaystothelowerinductor

currentthresholdwithatime constant of(R2)(C11), thus

completing the cycle.

Using the flyback regulator allows the maximum voltage

(50V)tobeappliedatthehighvoltagerail,HV.Inapplica-

tionswherethehighvoltageraildoesnotexceed40V,the

boost topology can be used. The advantage, as shown in

Figure2, is simplicity.Only aresistor,asmall inductor,a

diode and a capacitor are needed; there is no need for a

snubbercircuit.ThecurrentdrawnfromV

willbehigher,

however, by a factor of V

BOOST

To reconfigure the demo board’s flyback regulator into a

boost regulator, remove the snubber circuit’s compo-

nents, C9, R7, D3 and the transformer T1. Reconnect

diodeD1 andinsertthe optionalinductor as shownin the

Board Photos. Using the components provided with the

demo board (2Ωsense resistor, 200µH inductor and 1µF

capacitor) the boost regulator will run at around 700kHz.

To lower the frequency increase the inductor value; to

increase the frequency decrease the inductor value.

The boost regulator works as follows: when the switch is

on, the inductor current ramps up as the magnetic field

buildsup.Duringthisintervalenergyisbeingstoredinthe

inductorandnopoweristransferredtoV

BOOST

.Whenthe

2Ωresistorsensesthatthepeakinductorcurrenthasbeen

reached, the switch is turned off. Energy is no longer

transferred to the inductor, causing the magnetic field to

collapse. The collapsing magnetic field induces a change

in voltage across the inductor. The Switch pin’s voltage

rises until diode D1 starts conducting. As the inductor

currentrampsdown,thelowerinductorcurrentthreshold

is reached and the switch is turned on, starting the next

cycle.

Current drawn from V

is delivered to V

BOOST

. Some of

this current (~1.5mA) flows through the topside driver to

E2. This current is typically returned to ground via the

bottomMOSFETsortheoutputload.IfthebottomMOSFETs

areoffandtheoutputloadisreturnedtoHV,E2willreturn

the current to HV through the top MOSFET or the output

load. If the HV supply cannot sink current and no load

drawinggreater than 1.5mAis connected tothesupply, a

resistor from HV to ground may be needed to prevent

voltage buildup on the HV supply.

DEMO MANUAL DC102

50V N-CHANNEL HALF BRIDGE

PC LAYOUT AND FILM

Component Side Solder Mask

Component Side Silkscreen Component Side

Component Side Pastemask

DEMO MANUAL DC102

50V N-CHANNEL HALF BRIDGE

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However,noresponsibilityisassumedforitsuse.LinearTechnologyCorporationmakesnorepresen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

PC LAYOUT AND FILM

Solder Side Solder Side Soldermask

DEMO MANUAL DC102

50V N-CHANNEL HALF BRIDGE

LINEAR TECHNOLOGY CORPORATION 1997

LT/GP 0197 500 • PRINTED IN USA

PC FAB DRAWING

3.975

4.975

AAA

CC CC

DDDD

EE E

EEE EEE

EEEE

G G

SYMBOL

A

B

C

D

E

F

G

H



DIAMETER

0.095

0.125

0.028

0.032

0.040

0.205

0.156

0.072

NUMBER

OF HOLES

4

21

180

24

3

4

2

242

TOTAL HOLES

NOTES:

 1.MATERIAL: FR4 OR EQUIVALENT EPOXY, 2 OZ COPPER CLAD

 THICKNESS 0.062 ±0.006 TOTAL OF 2 LAYERS

 2.FINISH:  ALL PLATED HOLES 0.001 MIN/0.0015 MAX COPPER

 PLATE ELECTRODEPOSITED TIN-LEAD COMPOSTION

 BEFORE REFLOW, SOLDER MASK OVER BARE COPPER

 (SMOBC)

 3.SOLDER MASK: BOTH SIDES USING GREEN PC-401 OR EQUIVALENT

 4.SILKSCREEN: USING WHITE NONCONDUCTIVE EPOXY INK

 5.ALL DIMENSIONS ARE IN INCHES 

DM102A • PC FAB DWG

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

(408)432-1900

FAX: (408) 434-0507

●

TELEX: 499-3977

●

www.linear-tech.com

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

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