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Precision releases three transformers for Power Integrations Reference Design RDK-160

Precision and Power Integrations combine technologies for lowest component count charger / adapter designs.

custom transformer from Precision Incorporated
A custom transformer from Precision Incorporated helps this LinkSwitch-II CV/CC charger achieve its goals of reduced component count, EMI and isolation performance, and compliance with international energy efficiency standards. Fewer components mean more flexibility to design more compact applications than this example.

Precision Incorporated has released three custom transformers for use with the new Power Integrations LinkSwitch®-II reference designs for high-efficiency chargers and power adapters. The new Precision transformers help eliminate the need for EMI filtering components — reducing an application’s component count by 30% — while meeting global energy efficiency standards such as Energy Star 2.0, CEC, EU CoC and China CECP. Each transformer is designed for a different LinkSwitch-II application. Reference Design RD-157 is a 2.75W USB charger that complies with the China Charger standard for constant voltage/constant current (CV/CC) cell phone chargers, and requires the fewest components of any charger available today. RD-158 is a 5W charger/adapter design for high-end cell phones, PDAs and other power-hungry mobile devices. And RD-159 is a 2.4W adapter for cordless phones that can withstand a 10 kV surge.

Customized Transformers
“Precision is excited to work with Power Integrations by supplying the transformers for the LinkSwitch-II reference designs,” said David Anderson, Precision Incorporated’s CEO. “Welly Chou, our Senior Design Engineer for the Power Integrations applications, has worked extensively with Power Integrations to apply their patented E-Shield™ winding technology to Precision’s custom transformers. Aside from the LinkSwitch-II controller chip itself, the transformers are the only custom parts on the reference design circuit boards.”

“The Precision transformers eliminated the need for common mode chokes and the Y capacitor typically needed for EMI filtering,” Chou explained. “They achieve EMI standards compliance by a wide margin. The unique winding of the Precision transformer coil is critical. If it’s not wound correctly, the efficiency of the reference design power supply slips, and components must be added to minimize EMI.” Chou said that the Precision transformers have been approved by Power Integrations to meet its stringent construction, EMI and isolation standards. All three transformers are RoHS compliant.

RDR-157 complies with the China Charger standard for CV/CC cell phone chargers.  Precision transformer is 019-6119-00R.  Detailed specifications can be downloaded here.

RDR-158 is a high-power design for high-end and power hungry mobile devices.  Precision transformer is 019-6120-00R.  Detailed specifications can be downloaded here.

RDR-159 is an adapter for cordless phones.  It provides reliable power to phone and can withstand 10kV of surge.  Precision transformer is 019-6118-00R.  Detailed specifications can be downloaded here.

Productive Partnership
The transformers for the LinkSwitch-II reference design are the latest in a long series of components that Precision has designed and manufactured for Power Integrations product families including TOPSwitch, PeakSwitch, TinySwitch, DPA-Switch and other converter products.

“The working relationship between Precision and Power Integrations goes back six to seven years, and today we’re one of their top transformer suppliers,” Anderson said. “The engineers at Precision and Power Integrations have developed an excellent working relationship because Precision offers solutions, fast development and excellent turnaround on new designs and samples.”

Transformers Available
Samples of the transformers for the LinkSwitch-II Reference Design Kit (RDK-160), along with technical support, are available now from Precision Incorporated and Power Integrations. Lead time for production quantity is eight to ten weeks. Call for pricing information and samples ordering. Contact Precision at 800-749-3677 or contact us.

Precision also provides transformers for other Power Integrations Reference Designs (DAKs).  Click here for details.

Three models of the Power Integrations LinkSwitch® II, reference design, using Precision, Inc. custom transformer

RD-157

RD-157

Specification in PDF: RD-157
Transformer Spec. in PDF: 019-6119-00R
Available image size: 1256 x 1049

Description:

LinkSwitch-II reference design RD-157 is a 2.75W USB charger that complies with the China Charger standard for CV/CC cell phone chargers, and requires the fewest components of any charger available today.

RD-158

RD-158

Specification in PDF: RD-158
Transformer Spec. in PDF: 019-6120-00R
Available image size: 1256 x 983

Description:
LinkSwitch-II reference design RD-158 is a 5W charger/adapter design for high-end cell phones, PDAs and other power-hungry mobile devices.

RD-159

RD-159

Specification in PDF: RD-159
Transformer Spec. in PDF: 019-6118-00R
Available image size: 1256 x 1022

Description:

LinkSwitch-II reference design RD-159 is a 2.4W adapter for cordless phones
that can withstand a 10 kV surge.