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Overview
| Topology | Buck Converter |
| Input voltage | 85-265 V |
| Output 1 | 15.75 V / 0.7 A |
| IC revision | 1.3 |
Description
This document describes the design example of a power supply using the STR3A453D intended for the non-isolated buck converter that supports universal inputs and a 15 V/0.7 A output (0.8 A peak). The STR3A453D is a current mode PWM control IC with a built-in power MOSFET, developed for isolated flyback converters. However, the IC is also suitable for configuring non-isolated buck converters. In addition, the design example uses the SJPD-L5 as a fast recovery diode for the freewheeling diode, and the SJPD-D5 as a fast recovery diode for the IC’s power supply.This document contains the following: the specifications of the design example, circuit diagrams, the bill of materials, the setting examples of component constants, a pattern layout example, and the evaluation results of the power supply characteristics. For more details on the parts listed in this document, refer to the corresponding data sheets.
Features
- Reduced Number of External Components (Built-in Startup Circuit)
- High Efficiency in All Load Ranges Achieved by Load-based Auto-shifting Operation Modes Normal Operation: PWM Mode, 65 kHz (Typ.) Light-load Operation: Green Mode Standby Operation: Burst Oscillation Mode
- Efficiency: 84.3% (230 VAC, 10.5 W)
- Input Power at No Load: 42.8 mW (230 VAC)
- Reduced EMI Noise (Random Switching Function)
Typical applications
- Small Home Appliance, Large Home Appliance
- Auxiliary Power Supply, Other SMPSs (Switching Mode Power Supplies)
- Power Supply for Motor Control
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Safety Class | dV/dt(V/µs) | DF @ 1 kHz(%) | RISO | Pitch(mm) | Packaging | Tol. C | Size | Operating Temperature | DF(%) | Ceramic Type | Fl(mm) | ISAT,10%(A) | fres(MHz) | Version | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | Ø D(mm) | Pins | Type | G(mm) | Working Voltage(V (AC)) | IR(A) | L(mH) | RDC max.(Ω) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WCAP-FTXX Film Capacitors, Across the mains, 100 nF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTXX Film Capacitors | Capacitance100 nF | Safety ClassX2 | Rate of Voltage Rise300 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch10 mm | PackagingCarton | Capacitance±10% | SizePitch 10 mm | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | – | – | – | Pin length4 mm | – | – | – | – | Rated Voltage310 V (AC) | – | – | Length13 mm | Width7 mm | Height13 mm | MountBoxed THT | ||||
 | WE-TFC Common Mode Power Line Choke, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TFC Common Mode Power Line Choke | – | – | – | – | – | – | – | – | SizeUU 9.8 V | Operating Temperature -40 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | Pins4 | – | Pin length3.5 mm | – | Rated Current0.4 A | Inductance12 mH | DC Resistance2 Ω | Rated Voltage300 V (AC) | Insulation Test Voltage2500 V (AC) | MaterialMnZn | Length17 mm | Width11.5 mm | Height17 mm | MountTHT | ||||
 | WE-TI Radial Leaded Wire Wound Inductor, –, – | Downloads15 files EDA models: Components ZIP
Download all 15 files as zip archive | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | – | – | – | – | – | – | – | – | Size1018 | Operating Temperature -40 °C up to +125 °C | – | – | – | Saturation Current @ 10%2.1 A | Self Resonant Frequency2.4 MHz | VersionHeat Shrinking Tube | – | – | – | – | – | – | – | – | Rated Current1.75 A | Inductance0.22 mH | DC Resistance0.2 Ω | – | – | MaterialNiZn | Length11 mm | Width11 mm | Height19 mm | MountTHT | |||
 | WCAP-ATG5 Aluminum Electrolytic Capacitors, –, 22 µF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATG5 Aluminum Electrolytic Capacitors | Capacitance22 µF | – | – | – | – | Pitch2 mm | PackagingAmmopack | Capacitance±20% | – | – | Dissipation Factor10 % | – | – | – | – | – | Endurance 2000 | Ripple Current60 mA | Leakage Current11 µA | Diameter5 mm | – | – | – | – | – | – | – | Rated Voltage50 V (AC) | – | – | Length11 mm | – | – | – | ||||
 | WCAP-ATLI Aluminum Electrolytic Capacitors, –, 470 µF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATLI Aluminum Electrolytic Capacitors | Capacitance470 µF | – | – | – | – | Pitch5 mm | PackagingAmmopack | Capacitance±20% | – | – | Dissipation Factor10 % | – | – | – | – | – | Endurance 5000 | Ripple Current1415 mA | Leakage Current117.5 µA | Diameter10 mm | – | – | – | – | – | – | – | Rated Voltage25 V (AC) | – | – | Length16 mm | – | – | – | ||||
| WCAP-CSGP MLCCs 50 V(DC), –, 1 nF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance1 nF | – | – | – | Insulation Resistance10 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Ceramic TypeX7R Class II | Pad Dimension0.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage50 V (AC) | – | – | Length2 mm | Width1.25 mm | Height0.8 mm | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), –, 68 nF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance68 nF | – | – | – | Insulation Resistance7.4 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Ceramic TypeX7R Class II | Pad Dimension0.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage50 V (AC) | – | – | Length2 mm | Width1.25 mm | Height0.8 mm | – | |||||
 | WR-PHD Pin Header - Single, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header - Single | – | – | – | – | Insulation Resistance1000 MΩ | Pitch2.54 mm | PackagingBag | – | – | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | – | Pins2 | TypeStraight | – | Working Voltage250 V (AC) | Rated Current3 A | – | – | – | – | – | Length5.08 mm | – | – | MountTHT |