1. Passive Components Business Unit Targeted Pursuit Line Input Resistors

2. TT electronics resistors targeted at line input applications

3. Agenda
What is a Line Input Resistor? Where are they used? What products does TT electronics offer? How can we grow? What tools do we have to support design-in? Go Go Go Go Go

4. What is a Line Input Resistor?
A fixed resistor connected in series with the line (mains) input of a power supply.

5. What is a Line Input Resistor?
It serves up to three circuit functions:
Limiting inrush surge current at switch-on
Contributing to lightning surge protection
Preventing fire by fusing safely

6. What is a Line Input Resistor?
1. Limiting inrush surge current at switch on:
A larger than normal current flows at switch-on to fill the empty reservoir capacitor. To avoid damage to components an inrush limiting resistor is used…

7. What is a Line Input Resistor?
2. Contributing to lightning surge protection:
When lightning strikes it can cause high voltage surges on power lines. A standard test generator with “1.2/50µs” pulse is often used to simulate this…

8. What is a Line Input Resistor?
3. Preventing fire by fusing safely:
An internal fault in the power supply circuit, for example short circuit failure in the rectifier, will cause a high current and excessive heat. The resistor breaks the circuit…

9. In anything which is or contains a power supply….
Where are they used?
In anything which is or contains a power supply….
Line (mains) powered products
Products with electronic content

10. Where are they used? … so how do we focus? Adapters / Chargers
Energy Meters
White Goods
Medical X-ray Supplies
Industrial Controllers

11. Line Input Resistor Portfolio
Where are they used?
… by understanding where our products can deliver the greatest benefits to customers.
Line Input Resistor Portfolio

12. WP-S WHS EMC ULW (N)AS SP20F SPP BPC BPR
= new product / feature
Product Features
Wirewound
Metal Film
Thick Film
Axial
Radial
Ceramic Core
Fibreglass Core
V. High Surge
High Surge
Med. Surge
Low Power Fuse
Mains Fuse
UL1412 Fuse
Customiseable
Small Footprint
Vibration Proof
UL94-V0 Coat
SMD Option
WP-S ●
WHS
EMC
ULW
(N)AS
SP20F
SPP
BPC
BPR Go
Sep 2012 Go Go Go Go Go
Sep 2012 Go Go Go

13. WP-S WHS (N)AS BPC BPR Product Benefits
Technology platform for cost-effective custom pulse / fuse parts.
Pulse withstand variants allow the cost of using higher rated or multiple components to be avoided.
WHS
Optimised surge performance reduces field failure costs.
An off-the-shelf, surge rated solution avoids engineering costs involved in the creation of custom products.
(N)AS
Very high surge performance avoids cost of multiple part solution.
“N” version has double winding and can provide the energy rating of two parts at lower cost.
BPC
Very compact footprint can reduce the costs of PCB material, assembly and enclosure which are driven by PCB area.
Increased PCB area results in increased cost.
BPR
Vibration-proof terminals reduce field failure costs. Go Go Go Go Go

14. EMC ULW SP20F SPP Product Benefits UL Recognised Products
UL recognition reduces UL approval costs because testing at component level is less costly than at end product level.
Fast fusing specification reduces product liability costs.
Sufficient surge performance for adapters & chargers.
ULW
Good pulse performance reduces field failure costs.
Surface mount options reduce assembly costs on mixed technology boards.
SP20F
Fast, defined fusing reduces product liability costs.
Moderate surge performance reduces field failure costs.
SPP
Flameproof fusing specification reduces product liability costs. Go Go Go Go

15. Wirewound Power - Small
WP-S Series - WP2S, 25S, 3S, 4S, 5S
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Pulse & overload characteristics ideal for protection circuits
High power 2 to 5W
Flameproof cement construction
Compact size
Wide value range
Wirewound Power - Small
Line Input Application
High – can be customised
Failsafe
Go to App Note
Go to Datasheet

16. Wirewound High Surge WHS Series – WHS2, 3, 4, 5, 7
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Optimised surge characteristics ideal for protection circuits
High power 2 to 7W (10W in development)
Flameproof cement construction
Value range 1R0 to 330R meets typical inrush resistor requirement
Wirewound High Surge
Line Input Application
Optimised
Failsafe
Go to Datasheet

17. (Non-inductive) Anti-Surge Wirewound
(N)AS Series – (N)AS2, 2B, 2C, 3, 5, 7, 10
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(Non-inductive) Anti-Surge Wirewound
Surge reduction characteristics ideal for protection circuits
Up to 14W size
Non-inductive option (NAS) has double energy capacity
Wide range of values
Line Input Application
AS high, NAS very high
Failsafe
Go to Datasheet

18. Planar Power Thick-film
BPC Series – BPC3, 5, 7, 10
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Planar Power Thick-film
Overload characteristics ideal for protection circuits
High power 3 to 10W
Minimal PCB footprint area
Line Input Application
Good for long inrush time
Moderate
Test in application
Go to App Note
Go to Datasheet

19. Planar Power Thick-film
BPR Series – BPR3, 5, 7, 10, 20, 30, 50
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Planar Power Thick-film
Overload characteristics ideal for protection circuits
High power 3 to 50W
Minimal PCB footprint area
Vibration proof terminations
Line Input Application
Good for long inrush time
Moderate to high
Test in application
Go to App Note
Go to Datasheet

20. UL Recognised Fusible Film
EMC Series – EMC2
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UL1412 Recognised (file E234469)
Simplifies design of UL approved products
Lower cost than wirewound
Good pulse handling capability
Small size for power rating
UL Recognised Fusible Film
Go to UL Listing
Line Input Application
Moderate
UL Recognised, Fusing time guaranteed
Go to App Note
Go to Datasheet

21. UL Recognised Wirewound
ULW Series – ULW2, 3, 4, 5
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UL1412 Recognised (file E234469)
Simplifies design of UL approved products
Failsafe 120 / 240V mains fusing
Wirewound for excellent pulse handling capability
UL Recognised Wirewound
Go to UL Listing
Line Input Application
Optimised
UL Recognised, Fusing time guaranteed
Go to App Note
Go to Datasheet

22. Fibre Cored Wirewound SP20F Series – SP20F Line Input Application
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UL1412 Recognised (file E234469)
Recognised value range 1R0 to 470R
Moulded jacket fibre cored
Fast fusing down to 20W fault power
Fibre Cored Wirewound
Go to UL Listing
Line Input Application
Moderate
UL Recognised, Fusing time guaranteed, Fast low power fusing
Go to Datasheet

23. Fibre Cored Wirewound SPP Series – SPP1, 2, 3 Line Input Application
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UL1412 Recognised (file E234469)
Recognised 1 & 2W size, 1R0 to 470R
Flameproof cement coat fibre core
Fast fusing down to 40W fault power
Fibre Cored Wirewound
Go to UL Listing
Line Input Application
Moderate
UL Recognised, Fusing time guaranteed, Fairly fast low power fusing
Go to Datasheet

24. Alternative Solutions Competing Suppliers
How can we grow?
Line Input Resistor Portfolio
Win against
Win against
Alternative Solutions
Competing Suppliers

25. Advantages of using a Fixed Resistor
How can we grow?
Win against alternative solutions….
Alternative
Description
Advantages of using a Fixed Resistor
NTC
A resistor which is higher in value when cool, and so reduces current at switch-on.
A resistor works equally well if the system is switched off then back on immediately; an NTC does not protect the system until it’s had time to cool down.
Soft-start
Using a PSU circuit with controlled current.
A resistor, even with a shorting relay, offers a far simpler and lower cost solution.
Ceramic composition
A technology with very high surge energy capacity.
Composition resistors will not fuse even under extreme overload and so can get very hot in a fault condition.
Varistor only
Limits voltage spikes and often used with a resistor.
When used before the varistor, a resistor enhances lightning strike protection and adds inrush and fault protection.

26. Win against competing suppliers….
How can we grow?
Win against competing suppliers….
Source
Part
Surge Performance
Low Power / Fast Fusing
Mains Fusing
UL 1412 Range
Flameproof
Customisable
SMD Option
Technical Support
Comments
WP-S ●M ●B
SMD as Z-form or crop & tape
ULW ●P
UL recognition from 4R7 on 4 ratings
WHS/(N)AS
Best surge rating, may need fuse
SPP/SP20F
Fibre core gives fast low power fusing
Vitrohm
CRF
Standard cement coated wirewound
CRF-UL
UL recognition from 10R on 3 ratings
Vishay
AC / PAC
SMD as Z-form
Ohmite 40
SEI
SP3A
UL recognition from 10R on 1 rating
●B=Best ●M=Moderate ●P=Poor

27. Customisable + Mains Fusing
How can we grow?
Win against competing suppliers….
Source
Part
Surge Performance
Low Power / Fast Fusing
Mains Fusing
UL 1412 Range
Flameproof
Customisable
SMD Option
Technical Support
Comments
WP-S ●M ●B
WP-S: Best in Class
Customisable + Mains Fusing
WP-S (and closely related W31) is ideal as a platform for customisable mains fusing resistors with specified surge and/or fusing requirements.
For high volume applications we can obtain UL recognition for a customised part.
ULW ●P
WHS/(N)AS
SPP/SP20F
Vitrohm
CRF
CRF-UL
Vishay
AC / PAC
Ohmite 40
SEI
SP3A
●B=Best ●M=Moderate ●P=Poor

28. Customisable + Mains Fusing
How can we grow?
….by targeting applications where we have unique differentiators.
Example: Energy meter where safe mains fusing and very high reliability in the case of lightning strike surges is essential.
WP-S: Best in Class
Customisable + Mains Fusing
WP5S was selected because the lightning strike surge performance called for a custom winding, and the desired recessed SMD assembly method called for custom crop and pack.

29. Wide UL1412 Range + SMD Option
How can we grow?
Win against competing suppliers….
Source
Part
Surge Performance
Low Power / Fast Fusing
Mains Fusing
UL 1412 Range
Flameproof
Customisable
SMD Option
Technical Support
Comments
WP-S ●M ●B
ULW: Best in Class
Wide UL1412 Range + SMD Option
ULW features the widest range of ratings and values currently available recognised to UL1412 for Fusing Resistors.
It can be provided in SMD format using Z-form, making it the only SMD UL1412 part on the market.
ULW ●P
WHS/(N)AS
SPP/SP20F
Vitrohm
CRF
CRF-UL
Vishay
AC / PAC
Ohmite 40
SEI
SP3A
●=Best ●=Moderate ●=Poor

30. Wide UL1412 Range + SMD Option
How can we grow?
….by targeting applications where we have unique differentiators.
Example: White goods controller, where UL1412 recognition was required.
ULW: Best in Class
Wide UL1412 Range + SMD Option
ULW was selected because defined inrush surge and UL certified fusing were needed. The route to SMD conversion was also valued.

31. WHS & (N)AS: Best in Class Ultra-high Surge + Flameproof
How can we grow?
Win against competing suppliers….
Source
Part
Surge Performance
Low Power / Fast Fusing
Mains Fusing
UL 1412 Range
Flameproof
Customisable
SMD Option
Technical Support
Comments
WP-S ●M ●B
WHS & (N)AS: Best in Class
Ultra-high Surge + Flameproof
WHS and (N)AS offer extremely high surge energy to volume ratios in flameproof coated products.
ULW ●P
WHS/(N)AS
SPP/SP20F
Vitrohm
CRF
CRF-UL
Vishay
AC / PAC
Ohmite 40
SEI
SP3A
●=Best ●=Moderate ●=Poor

32. ….by targeting applications where we have unique differentiators.
How can we grow?
….by targeting applications where we have unique differentiators.
Example: Motor invertors with very high reservoir capacitance leading to high inrush current.
WHS & (N)AS: Best in Class
Ultra-high Surge + Flameproof
WHS &(N)AS should be selected where the highest inrush surge requirements combine with the need for a compact flameproof component.

33. Low Power / Fast Fusing & UL1412
How can we grow?
Win against competing suppliers….
Source
Part
Surge Performance
Low Power / Fast Fusing
Mains Fusing
UL 1412 Range
Flameproof
Customisable
SMD Option
Technical Support
Comments
WP-S ●M ●B
SPP/SP20F: Best in Class
Low Power / Fast Fusing & UL1412
SPP & SP20F are the only fibre core wirewound resistors on the market with UL1412 recognition.
This core material offers far better thermal insulation than a ceramic core, and this permits the wire to heat up and fuse more rapidly.
ULW ●P
WHS/(N)AS
SPP/SP20F
Vitrohm
CRF
CRF-UL
Vishay
AC / PAC
Ohmite 40
SEI
SP3A
●=Best ●=Moderate ●=Poor

34. Low Power / Fast Fusing & UL1412
How can we grow?
….by targeting applications where we have unique differentiators.
Example: High-end domestic & industrial HVAC airflow control actuator, with target markets requiring UL or similar approvals.
SPP/SP20F: Best in Class
Low Power / Fast Fusing & UL1412
SPP1 was selected because UL1412 was mandatory and with previous types, when subjected to fault conditions, a failure to fuse quickly resulted in a hole melted in the plastic cover.

35. Case 1: Replacing Resistor and UL Fuse
A custom W31, closely related to WP-S series, provides both inrush protection and mains fusing functions for a shaver adaptor.

36. Case 1: Replacing Resistor and UL Fuse – Value Equation
Values in USD/100

37. Case 1: Replacing Resistor and UL Fuse – Value Proposition
For PSU designers that need reduced component count we provide EMC series which allows combination of UL fuse and resistor, unlike standard wirewound resistors, as demonstrated by its UL recognised status.

38. Case 2: Replacing Commodity Resistor

39. Case 2: Replacing Commodity Resistor – Value Equation
Values in USD/100

40. Case 2: Replacing Commodity Resistor - Value Proposition
For white goods manufacturers that need reduced approval and field failure costs we provide ULW series which allows reliance on pulse and fusing performance unlike commodity wirewound resistors as demonstrated by its UL recognised status.

41. What tools do we have to support design-in?
Application Notes
Go to App Note
Go to App Note
Go to App Note

42. What tools do we have to support design-in?
Published Article
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43. Thank you
Are there any questions?