SY50213W Overview
The Silergy SY50213W is a highly integrated single-stage primary-side regulated flyback switching regulator optimised for CC/CV (Constant Current / Constant Voltage) power conversion. Unlike conventional flyback designs that rely on an optocoupler and secondary-side error amplifier for output regulation, the SY50213W senses both output current and output voltage entirely from the primary side. This architecture eliminates significant BOM cost and assembly complexity, making the SY50213W an attractive solution for cost-sensitive consumer and light industrial power supplies. The device integrates an 800V breakdown bipolar NPN power transistor within the SO-8 package itself, further reducing external component count and minimising solution footprint.
Silergy’s SY50213W employs quasi-resonant (QR) operation combined with adaptive PWM/PFM control to maximise average efficiency across the full load range while maintaining excellent EMI characteristics. At light and no-load conditions, the switching frequency reduces to as low as 500Hz, dramatically cutting standby power loss — a critical requirement for modern energy efficiency standards such as ErP Lot 6 and DoE Level VI. The SY50213W also incorporates programmable cable compensation, which corrects for resistive voltage drop in the output cable, ensuring tightly regulated voltage at the load terminals regardless of cable length — a valuable feature for USB chargers and desktop adapters.
The SY50213W includes a comprehensive protection suite covering input overvoltage protection (OVP), short circuit protection (SCP), over-temperature protection (OTP), output voltage OVP, VSEN/ISEN pin short protection, and upper divider resistor disconnect protection on the VSEN pin. This breadth of integrated protection reduces the need for external protection circuitry and enhances end-product reliability. ABL Semi distributes the SY50213W as a fully authentic, original Silergy factory product, supporting UK and European customers with compliance-ready documentation and flexible ordering from prototype through to volume production.
Key Specifications
| Parameter | Value |
|---|---|
| Topology | Primary-Side Regulated (PSR) Flyback |
| Control Mode | Adaptive PWM / PFM (Quasi-Resonant) |
| Input Voltage (VInput) | 6V to 14V (control supply) |
| Integrated Transistor Breakdown Voltage (VBreakdown) | 800V |
| Output Current (IOutput) | 2.1A |
| Power Dissipation (PD) | 1.1W |
| Minimum No-Load Switching Frequency | 500Hz |
| Regulation Method | Primary-side sensing — no opto-isolator required |
| Cable Compensation | Programmable |
| Output Regulation Mode | CC/CV (Constant Current / Constant Voltage) |
| Package | SO-8 |
| Protection Features | OVP, SCP, OTP, VSEN/ISEN pin short, upper divider disconnect |
Applications
The SY50213W is well-suited to space-constrained, cost-sensitive AC/DC power conversion applications requiring isolated CC/CV output regulation. Primary use cases include USB chargers, smartphone and tablet adapters, LED lighting drivers, set-top box power supplies, and desktop power adapters. The device is also applicable in smart home appliance power supplies and small industrial SMPS designs where primary-side regulation, low standby power, and a compact PCB footprint are key design requirements.
Pin-to-Pin Compatible Alternatives
The SY50213W’s SO-8 package and primary-side regulated flyback architecture make it a direct functional and footprint replacement for several widely used flyback controllers, enabling engineers to reduce BOM cost and diversify supply sources without PCB redesign.
| Reference Part Number | Original Manufacturer | Why Choose SY50213W |
|---|---|---|
| TNY290DG | Power Integrations | Comparable integrated flyback switcher in SO-8; SY50213W offers native CC/CV PSR control and programmable cable compensation at lower cost |
| NCP1342 | onsemi | Equivalent PSR flyback controller targeting CC/CV charger applications; SY50213W integrates the power switch, reducing external component count further |
| STR-W6765 | Sanken Electric | Integrated flyback regulator in similar package; SY50213W provides adaptive PWM/PFM QR operation with lower no-load frequency for improved standby efficiency |
| NCP1014 | onsemi | Self-supplied flyback switcher with integrated MOSFET; SY50213W adds primary-side CV/CC sensing and eliminates the opto-isolator for a simpler, lower-cost design |
Frequently Asked Questions
Is SY50213W RoHS compliant?
Yes. The SY50213W is RoHS compliant. Silergy manufactures the SY50213W in accordance with EU RoHS Directive 2011/65/EU, ensuring the device is free from restricted hazardous substances including lead, mercury, and cadmium. ABL Semi can provide full compliance and trade documentation upon request.
What are the pin-to-pin replacements for SY50213W?
The SY50213W is a strong functional and footprint alternative to popular flyback controllers including the Power Integrations TNY290DG, onsemi NCP1342, onsemi NCP1014, and Sanken STR-W6765, all of which share a comparable SO-8 integrated flyback architecture. Refer to the compatibility table above for a detailed feature-by-feature comparison.
What is the minimum order quantity (MOQ) for SY50213W?
ABL Semi offers flexible MOQ for SY50213W, supporting both prototype quantities and mass production orders. Contact us for current stock and pricing.
What package options are available for SY50213W?
The SY50213W is available in the SO-8 (Small Outline 8-pin) package. This compact, industry-standard SMD package is well-suited to space-constrained AC/DC converter PCB designs. The integration of the 800V power transistor within the SO-8 housing is a key differentiator of the SY50213W, eliminating the need for a separate external power switch. Contact ABL Semi to confirm current stock availability.
Does the SY50213W meet modern standby power regulations?
Yes. The SY50213W’s adaptive PWM/PFM quasi-resonant control reduces the no-load switching frequency to as low as 500Hz, minimising switching losses at light and zero load. This behaviour supports compliance with international standby power efficiency standards including EU ErP Lot 6 and US DoE Level VI, which mandate no-load power consumption below 0.1W for many charger and adapter product categories. Designers targeting energy-label compliance will find the SY50213W’s standby performance a significant advantage over fixed-frequency flyback alternatives.