Introduction to SIDACtor ® Overvoltage Protection Devices.

Introduction to SIDACtor®

Overvoltage Protection Devices

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Outline

Overvoltage Protection– The race is on– Clamp vs Crowbar

Key Parameters– Vdrm– Vbo– Vs – Holding Current– Surge Current Withstand

Double Exponential Waveforms

Power Cross Considerations

Protected Circuit Issues– Let-through voltage

– Turn-on time

– Capacitance Vbo Dependence Applied voltage dependence Surge Capability dependence

Configurations– Single Devices– SLIC Devices– 2-Chip Devices– 3-chip “Y” Devices

Package Options Selection Process

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The Race is On!

Overvoltage Protector

Protected Circuit

Overvoltage Event

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Vline

Trigger Voltage

Delatch

Crowbar Devices

Vline

Transient Event

Vline

Clamping Devices

Clamp Voltage

Clamping Devices vs Crowbar Devices

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Outline






– Turn-on time




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Key Parameters

Voltage – Current (V-I) Curve

• Voltage is displayed left to right

• Current is displayed up and down

+I

+V-V

-I

ITIS

IH

IDRM

VTVDRM VBO VS

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Key Parameters: VDRM

+I

+V-V

-I

IT

IS

IH

IDRM

VTVDRM VBO VS

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Key Parameters: VBO

+I

+V-V

-I

IT

IS

IH

IDRM

VTVDRM VBO VS

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Key Parameters: VS

+I

+V-V

-I

IT

IS

IH

IDRM

VTVDRM VBO VS

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Key Parameters: Holding Current (Ih)

+I

+V-V

-I

IT

IS

IH

IDRM

VTVDRM VBO VS

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Key Parameters: Surge Current Withstand

Double Exponential Waveforms– Simulate induced lightning events– Rise time & decay time in microseconds

Underground LineUnderground Line

Transients

Transients

Transients

Transients

10 x 10008 x 202 x 10

10 x 70010 x 5605 x 320

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Key Parameters: Power Cross Events

Accidental contact with power lines• Construction Accidents• Traffic Accidents• Weather-related Accidents

Inductive coupling• Co-locating telephone cables with power cables• Improper grounding

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Outline






– Turn-on time

– Capacitance Vbo Dependence Applied voltage dependence Surge Capability

dependence Configurations

– Single Devices– SLIC Devices– 2-Chip Devices– 3-chip “Y” Devices


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Protected Circuit Issues:Let-Through Voltage

Let-through voltage: The peak voltage that the protected circuit will see in the real application.

Similar to the datasheet Vs value:– Vs is defined as the peak voltage measured directly across

the SIDACtor at a particular voltage rate of rise. Dependent on:

– Actual incident voltage rate of rise– Board layout:

SIDACtor should be as near the entrance to the board as possible.

SIDACtor should be “in-line” so that the surge must pass under the SIDACtor on the way to the protected circuit..

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Protected Circuit Issues:Turn-On Time

Turn-On Time– Time to clamp– Time to crowbar– Clamp to crowbar transition time

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Capacitance vs Vbo(C-rated "MC" SIDACtor, 2V Bias)

0

10

20

30

40

50

60

70

80

0 100 200 300 400Vbo

pF

Protected Circuit Issues:Capacitance

Vbo Dependence

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Capacitance vs Applied Voltage(P2600SCMC)

0

10

20

30

40

50

60

0 10 20 30 40 50 60

Applied Voltage

pF


Applied Voltage Dependence

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Surge Capability Dependence

P2300xx A B C D RE ME

Surge Rating

(8x20)

150 250 400 1000 3000 5000

Capacitance

(pF @ 2V)

30 38 55 65 220 475

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Outline






– Turn-on time




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SIDACtor Device Configurations:Standard Single Devices

The Original Flexible Board Layout

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SIDACtor Device Configurations:SLIC Single Devices

SIDACtor Device for Negative Voltages Diode Device for Positive Voltages

SubscriberLineInterfaceCircuit

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SIDACtor Device Configurations:2-Chip Devices

TwinChip 2-in-1 Packaging Matched Chips

TwinSLIC 2-in-1 Packaging 1 pkg per port

Broadband Optimized Half the capacitance Better linearity

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SIDACtor Device Configurations:3-Chip “Y” Devices

Lower Capacitance Better Capacitance Balance Better Voltage Balance Better Surge Balance 3-for-1 Placement Advantage

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SIDACtor Device Configurations:Tracking Devices

BATTRAX Trademark Sophisticated SLIC protection Retains diodes for positive surges Negative breakdown voltage

determined by reference Positive voltage tracking also

available

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SIDACtor Device Configurations:Bridge Devices

For Broadband Applications– And more!

Patented Bridge Design Low Capacitance Great Capacitance Balance Perfect Voltage Balance Perfect Surge Balance Biasing provides flat lower and

flatter capacitance

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Outline






– Turn-on time




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SIDACtor Part Numbering

A: ITU K.20 & K.21

B: TIA-968-A

C: GR-1089

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Package Options:Thru-Hole

TO-218

E

M

A

R

G

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Package Options:Surface Mount

5x6 QFN

3x3 QFN

3.3x3.3 QFNS C Q22

U

Q12

Q38 N

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Outline






– Turn-on time




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Selection Methods

Datasheet Parameters– Vdrm, Vbo, Vs– Ih– Surge Current Withstand– Capacitance & Linearity

Configuration Selection Package Selection

+I

+V-V

-I

ITIS

IH

IDRM

VT VDRM VS

Normal System

VoltagesSIDACtor Protection

Range

System DamageVoltages

+I

+V-V

-I

ITIS

IH

IDRM

VT VDRM VS

Normal System

VoltagesSIDACtor Protection

Range

System DamageVoltages

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Thank You!

Introduction to SIDACtor ® Overvoltage Protection Devices.

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Transcript of Introduction to SIDACtor ® Overvoltage Protection Devices.