SEPIC and LDO (3.3V@40mA; 15V@2mA) for Radio Controlled LED Light Bulb


Design files


The PMP5353 reference design provides a non-isolated 3.3V at 40mA and 15V at 2mA from a 120VAC/60Hz input in less than 1 square inch of board space. This design uses the UCC38C44 to control a SEPIC topology. The SEPIC clamping capacitor reduces ringing on the drain of the MOSFET and recaptures leakage energy to improve efficiency. A TPS72901 LDO is used to minimize noise on the 3.3V output.

Output voltage options PMP5353.1
Vin (Min) (V) 85
Vin (Max) (V) 132
Vout (Nom) (V) 3.3
Iout (Max) (A) .04
Output Power (W) .132
Isolated/Non-Isolated Non-Isolated
Input Type AC
Topology Sepic- CCM

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

SLUR138.PDF (1185 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

SLUR139.PDF (50 K)

Detailed schematic diagram for design layout and components

SLUR137.PDF (19 K)

Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

TPS792100-mA, high-PSRR, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF
PWM controllers

UCC38C4420V, 1-A, Low current 1MHz current mode PWM controller with 14.5V/9V UVLO 50% duty cycle, 0C to 70C

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
Technical article Power Tips: Powering the IoT in Our Homes Jun. 11, 2014
Test report PMP5353 REVC TEST RESULTS Dec. 17, 2010

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