apac-200706 digpower...

Silicon Laboratories Confidential

♦ High-performance CMOS upgrades for opto couplers, isolation transformers and competing silicon isolators.

♦ World’s fastest, highest peak current and most integrated isolated gate drivers.

2.5 kVIsolators

PDP TVsPower SuppliesMotor Controls

Lighting BallastsRS232 to RS485

Industrial Data Acquisition

ISOdriversPDP TVs

Power SuppliesMotor Controls

Lighting Ballasts

AC CurrentSensorsPower SuppliesMotor Controls

Lighting Ballasts

♦ World’s best AC current sensor: higher accuracy, smaller, more integrated than all competing technologies!


Power Delivery System Block Diagram(typical of power supplies, UPS systems, ballast and motor controls)

VOUT

01

ISOLATED GATE DRIVE

SIGNAL

01

01

SECONDARYPOWER STAGES

PRIMARYPOWER STAGES

VIN

Si85xxCURRENTSENSORFamily

POWERCONTROLLER

NON-ISOLATED DRIVERS

LOAD

Si82xxIso-Driver

Family

Si84xxIsolatorFamily


!"

♦ Fastest throughput 50% faster than existing digital

isolators

♦ Highest integration From 1 to 4 channels per package

♦ Lowest power consumption Substantially lower than Optos

♦ Ease of use Single chip solution

♦ Economical Competitive volume pricing

♦ In Production NOW!

# Silicon Laboratories Confidential

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Non-Isolated System

HV Path

♦ A high-voltage breakdown path exists through the control circuitry

Hig

h V

olta

ge

( Silicon Laboratories Confidential

)*

♦ High voltage path is blocked because of high impedance between grounds

ISOLATOR

Very high impedance between grounds!

Hig

h V

olta

ge


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High throughput: DC to 150 Mbps

600 VDC (2.5KVRMS) isolation

Safety certified by UL, CSA, and VDE

Low 12mW/channel at 100 Mbps

High precision:

- 10 nS propagation time

- 2 ns max pulse width distortion

- 1 ns channel-channel matching

- 2 ns pulse width skew

High 25 KV/s transient immunity

Tri-state outputs with ENABLE control

Wide 2.375 to 5.5 V supply voltage

No start-up initialization required

<10 s Startup Time

Wide –40 to +125 °C operating temp range

Available in 1,2,3 or 4 channel package

Up to 150 MBPS throughput

Low 10 nS propagation delay

. Silicon Laboratories Confidential

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01 Silicon Laboratories Confidential

2%/!%3//

2.5 V min

5 V max

Low

Voltage

Logic

5 V Logic

150MBPS max

150 MBPS max

Prop Delay <10 nS

Data D

irectionSi844x


+//

ADC

Analog Signal

3 V

AIN

HV DC Common

MCUU

p to ±600 V

Differential

HV DC Common

+

5 V

-


4!/)


//35 67

- System communication ports (e.g. PoE systems)

- Test equipment

- Intermediate power busses- Telecom/datacom systems

- Isolated dc/dc (telecom/datacom)- Motor controls

- Industrial control systems- Lighting systems

- Test equipment (ground loop elimination)- Industrial control systems

♦ Example applications:- AC/DC and DC/DC power supplies

♦ Can be used anywhere else where working voltage is 120 V or less

♦ Example applications:

♦ Cannot directly isolate 240 V♦ Can be used everywhere in the system

240 V AC Line120 V AC Line

0# Silicon Laboratories Confidential

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Si8440/45

Si8441

Si8442

Si8430

Si8431

Si8420

Si8421

Si8410

4-Channel 3-Channel 2-Channel 1-Channel

16SO(W)

Package

3

3

3

4

4

4

Channels

1Si843x-A-IS

10Si843x-B-IS

150Si843x-C-IS

1Si844x-A-IS

10Si844x-B-IS

150Si844x-C-IS

Speed (MBPS)

Part Number

8SO

Package

1

1

1

2

2

2

Channels

1Si841x-A-IS

10Si841x-B-IS

150Si841x-C-IS

1Si842x-A-IS

10Si842x-B-IS

150Si842x-C-IS

Speed (MBPS)

Part Number


++:

♦ Generate an output signal proportional to measured current

♦ Used in power system of all kinds Power supplies, motor controls, lighting controls Provide critical information for system control and safety

♦ Big market: 120M+ unit SAM in 2007!

POWER CONTROLLER

CURRENTSENSOR

POWER STAGE

CURRENT

10A

0A

SIGNAL

2V

0V

0. Silicon Laboratories Confidential

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♦ Available in 5 A, 10 A and 20 A full scale♦ Layout bypass techniques extend full-scale range beyond 50 A

Scaleable Range

♦ Single-chip, 4x4x1 mm QFN packageSmall Size

♦ Same quality and reliability as standard CMOS integrated circuits High Quality/Reliability

♦ Accurate to ±5% of measurement—reduces or eliminates calibration♦ Tighter unit-to-unit matching

High Accuracy

♦ Only 1 mΩ series R and 2nH series L—low power loss, less ringingLow Loss

♦ On-board signal processor eliminates external circuitry: No external components other than a VDD bypass capacitor No external RC filter Eliminates the need for leading-edge blanking circuitry Si851x eliminates second current transformer circuit in full bridge applications High accuracy operation reduces or eliminates calibration

♦ Price-competitive with CT, MR, Hall effect sensors

Low Installed Cost

Si85xx Feature/BenefitDesirable Current Sensor Attributes


Clean current signal!

PC Board Trace

Cur

rent

Flo

w

2$ -

Current waveform is recovered and conditioned

Current through slug induces a voltage on chip inductor


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50 – 1,00050 – 1,00050 – 1,000DC - 300DC - 200Bandwidth (KHz)

40606025 –15020Footprint (mm2)

10-100100100-50010-10010-200Output (mV)

2

35

Opamp, 4R, 1C

0.5

No loss

Low-Side MOSFET

252 -51Height (mm)

251510 - 305Accuracy (±±±±%)

2 Opamps, 6R, 2C1D, 1R, 1C1R, 2C1R, 1CBOM

0.51.01.81.8Relative Cost

No loss6 - 20No loss10Series R (mΩΩΩΩ)

DCRCTHall Effect/ MR Sensor

SeriesResistor

ISENSE

VOUT

ISENSE

VOUT

ISENSE

1

16

2,000

5

1C

50 – 1,000

1.0

1

Si85xx


RESET Logic Selection by Topology

Si851x

Si850x,Si851x

Si851x

Si850x,Si851x

Si850x,Si851x

DEVICES

XNOR [R1, (R2 | R3)]

XOR(R1, R2)

[R1 & R2] | [R3 & R4]

XOR(R1, R2)

XOR(R1, R2)

RESET ALGORITHM

♦ 2 Wire Ping-Pong mode:♦ MODE input must = 1 ♦ R3 and R4 must be = 0

R1, R2Push-Pull

♦ R2 must be = 0. ♦ R3 must also = 0 if Si851x is used

R12-Switch Forward

♦ 4-wire Ping-Pong mode ♦ MODE input must = 0

R1, R2, R3, R4Full Bridge


R1Half Bridge


R1Buck or Boost

COMMENTRESET INPUTS USED

TOPOLOGY

Example RESET connections for common switch mode topologies:


,-=> 1


>+:/*

Actual current*

Si85xx output

* Differential oscilloscope probe across current sense resistor

♦ Noise and leading-edge spikes are filtered out by Si85xx integrating action♦ No output filter or leading-edge blanking required


9=*

♦ Low series inductance and on-board signal processing reduces ringing commonly found in current transformer circuits

CT Output

Si85xx output


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♦ Typical BOM is a minimum* of 10 components 2 current sense transformers 2 diodes and/or capacitors 4 resistors

CONTROLCIRCUIT A

B

* Does not include CT reset circuit


,

♦ Si851x ping-pong output: routes current signal from each side of the bridge to individual output pins >80% BOM component count reduction Higher accuracy, smaller size, lower cost, smaller BOM

CONTROLCIRCUIT A

B

VIN+

( Silicon Laboratories Confidential

Customer’s system

)7,2/$ *

Si85xx solder-in boardEnables customers to install the Si85xx in their system immediately and without laying-out a new board

1 2 3 4 5c m


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♦ ISOdriver = isolator + driver in one package

♦ Displaces discrete or integrated opto + driver, or gate driver transformers in power supplies, motor control and lighting control applications

♦ Big market: 100M+ unit SAM in 2007!


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♦ BOM: 2 opto couplers, 1 driver, 4 resistors, 4capacitors (~490 mm2)♦ Opto coupler issues

Characteristics vary with temperature and age Slow propagation time

CONTROLLER

OUTH

High Side/Low Side Driver

GND

OUTL

VDD

VIN

VDD2

CBSTRAP

Opto Coupler

Opto Coupler

Isolation Barrier

Load

VDD1

Ground 1

Ground 2

Ground 2

Ground 2

Ground 2

VDD2

Ground 2


:/+

♦ BOM: 1 Si823x ISOdriver, 3 capacitors, 1 diode (~200 mm2)♦ Fast propagation time, stable over temperature and age♦ Simplifies layout


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VIN

A

B

VOUT

Simple Buck Converter

SHOOT-THROUGH CURRENT

High-side/low-side ISOdrivers protect switching transistors from failures caused by high-side/low-side timing overlap


:/ 9 )33*

♦ Si823x allows dead time adjustment for optimum efficiency Adequate time for Q1 to turn off without shoot-through Minimize conduction time through Q2 body diode Programmed dead time with a single resistor to ground

* Q2 RDSON = 5mΩ

A

B

Dead Time

Dead time Cannot = 0!!Must allow time for Q1 to completely turn off before Q2 turns ON!!

Simple Buck Converter

Q2 power loss when ON = IOUT

2 x RDSON

= 0.5W

Q2 Power loss when OFF = VT x IOUT

= 7W!!!


: :

Wide application range600 VDC isolation (in/out and out/out)

More timing margin and/or faster control loop responseFast prop times

Glitch-free start-up/shutdownInput & output UVLO

Facilitates local ON/OFF control/protectionDISABLE input

Higher efficiency, greater safetyOverlap protection

Allows user to “tune” system for peak efficiencyProgrammable dead time control

Connects directly to controllers of all typesTwo-wire or PWM input versions

BENEFITFEATURE

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PWM output controller driving high-side/low-side ISOdriver

2-wire output controller driving high-side/low-side ISOdriver


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2.5“Opto”HCP-3xxx ReplacementSingle-channelSi8220

4.0VIA, VIB--Dual low-sideSi8235

4.0PWMHigh-side/low-sideSi8234

4.0VIA, VIBHigh-side/low-sideSi8233

0.5VIA, VIB--Dual low-sideSi8232

0.5PWMHigh-side/low-sideSi8231

0.5VIA, VIBHigh-side/low-sideSi8230

Pk IOUT (A)

InputsProgrammable Dead Time

Overlap Protection

ConfigurationPart Number


115 2%@!:

♦ Key application is control driver in plasma displays♦ Overlap protection and programmable dead-time control♦ Input and output UVLO: no glitches on start-up/shut down♦ Better timing specs—improved timing margins, less unit-to-unit variation♦ Also available in dual low-side version (Si8232—no overlap protection)


1+ /+ /

Can be used in sustain and energy recovery circuits

New design

HS/LS or dual LS operation

20

5

0.5 A

113 mm2

1

Si8220

Can fine-tune timing without modifying control circuits

Dead time control

Higher production yield, fewer warranty repairs

~15Channel-to-channel matching (nS)

Higher production yield, fewer warranty repairs

~80Unit-to-unit matching

Can drive lower cost transistors (or a greater number of transistors)

0.35 AOutput drive (A pk)

Size advantage122 mm2Installed size (mm2)

Cost, integration advantages7Number of components

Silicon Labs BenefitDiscrete Opto + Driver


@512%@!:

♦ 4 A peak drive current Available with 2-wire or single PWM control inputs Overlap protection and programmable dead time Input and output UVLO: no glitches on start-up/shut down

♦ Also available in dual low-side version (Si8235) ♦ Key applications

Power supplies, UPS systems, motor control, lighting systems


:/A+ /)/

♦ Two die One GaAS and one Bi-polar

♦ Split lead frame♦ Clear epoxy sheet placement♦ Two molding compounds

Inner is IR Tx friendly

♦ Estimated assembly cost at $0.40 - $0.50

Clear Epoxy

Interface

Device

LED


1:/=/

Pin-for-pin upgrade for Avago HCPL-31xx, Toshiba HCPL-31xx and other opto drivers

14x faster prop delays

30x lower pulse width distortion

6x faster rise and fall times

20x better unit-to-unit matching

Stable operation over temp and age

Higher reliability

Higher efficiency/lower input current

Better common mode transient immunity

More flexible input circuitry

Delay time independent of input drive

30 CONFIDENTIAL

SMPS Topology


)/,=B

~2KV

250V


://5 67

♦ 2.5 KV isolators serves all 120 V line applications♦ 2.5 KV isolators serve many 240 V line applications

Examples: Isolated dc/dc converters for telecom/datacom Industrial data acquisition systems Isolated communication interfaces Sensor interface applications (ground loop elimination)

2.5 KV isolator coverage at 120 VAC 2.5 KV isolator coverage at 240 VAC

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