Does the IC produce any audio noise?

No, the burst mode control provides excellent efficiency without audio noise.

What are the main applications for this IC?

It is designed for offline AC/DC flyback converters, AC/DC adaptors, open-frame SMPS, set-top box power supplies, and ATX standby power.

Power Switch Balance TM PWM Fixed 50kHz Fsw SF1539 IC CTC

Name: Power Switch Balance TM PWM Fixed 50kHz Fsw SF1539 IC CTC
Brand: CTC Technology Co., Ltd.
SKU: 910229105

Guangdong, ChinaCTC Technology Co., Ltd.

US$0.14

2,000-7,999 Pieces

US$0.07

8,000-11,999 Pieces

US$0.04

12,000+ Pieces

Product profile

Customization

Available

Conductive Type

Unipolar Integrated Circuit

Integration

LSI

Model NO.

SF1539

Technics

Thin Film IC

Feature

Low Standby

shape

DIP

Transport Package

Carton

Specification

Other

Trademark

Sifirst

Origin

China

HS Code

8542399000

Production Capacity

10000000

Key features

Fixed 50KHz Switching: PWM switching frequency is fixed to 50KHz with tight range trimming.

Integrated 600V MOSFET: Built-in 600V Power MOSFET for compact offline flyback converter designs.

Audio Noise Free: Burst mode control ensures excellent efficiency without audible noise.

Comprehensive Protections: Includes UVLO, OVP, OCP, OLP, VCC Clamping, and Pins Floating Protection.

DIP8 Package: Available in standard DIP8 package for easy integration.

1 Year Warranty: Comprehensive 1-year warranty coverage for all mechanical defects.

Fast Lead Time: Typical lead time of 3-7 days with abundant inventory availability.

Company profile

CTC Technology Co., Ltd.

Guangdong, China

Business Type: Manufacturer/Factory, Trading CompanyExport Year: 2013-01-03 CertifiedNearest Port: Shenzhen PortAverage Response Time: ≤6.09h CertifiedTerms of Payment: LC, T/T, PayPal, etc. CertifiedInternational Commercial Terms(Incoterms): FOB, CIF, CFR, EXW

AI-Powered supplier vetting

SummaryCTC TECHNOLOGY CO., LTD. is presented as a China-based electrical and consumer-electronics manufacturer with an owned factory, multiple customer support centers, and product coverage spanning home appliances, mobile chargers, connectors, PCBA, and related electronic components. The supplier reports export activity since 2013, with exports representing 71%–90% of total sales. Production information includes three production lines, approximately 1,000,000 mobile chargers annually, more than 500 factory workers, and 6–10 quality-control staff. ISO 9001:2008, CE, RoHS, and BIS are stated for its home-appliance products. Evidence also shows transactions involving connector products with BAJAJ COMMUNICATIONS PRIVATE LIMITED and PENGUIN ELECTRONICS PRIVATE LIMITED. However, after-sales processes, financial credibility, customization execution, and innovation results are not sufficiently documented. Financial figures are omitted.

Supplier typeThe supplier is described as a manufacturer with its own factory, producing home appliances and mobile chargers while also offering electronic components, PCBA, charger solutions, and related products. Its stated business scope covers Electrical & Electronics and Consumer Electronics, with export activity conducted through agency and self-operated channels.

CertificationsThe supplier states that its products have been certified by ISO 9001:2008 quality system, CE, RoHS, and BIS. The evidence does not specify certification scope, validity, or whether all listed connector and charger products are covered, but it explicitly supports certification holding for its stated product range.

Production capacityThe supplier reports an owned factory, more than 500 factory workers, three production lines, approximately 1,000,000 mobile chargers of annual output, and 6–10 quality-control staff. It also states that 90% of wire, plastic parts, circuit boards, metal stamping, packaging, and other accessories are produced internally, providing explicit evidence of substantial manufacturing and vertical-integration capability.

Client casesShipment records associate CTC TECHNOLOGY CO., LTD. with BAJAJ COMMUNICATIONS PRIVATE LIMITED for Type-C connector products and with PENGUIN ELECTRONICS PRIVATE LIMITED for L-type electrical connectors. These records provide named-buyer evidence and repeated product transactions, although they do not establish order scale, satisfaction, duration, or performance outcomes.

Product Q&A

Q:What is the switching frequency of the SF1539?

The PWM switching frequency is fixed to 50KHz and is trimmed to a tight range.

Q:What protection features are built into the SF1539?

It includes Under Voltage Lockout (UVLO), VCC Over Voltage Protection (OVP), Cycle-by-cycle Current Limiting (OCP), Over Load Protection (OLP), and Pins Floating Protection.

Q:What is the warranty period for this product?

We provide a 1-year warranty for this power switch IC.

Q:What is the typical lead time for delivery?

The typical lead time is 3-7 days, with peak and off-season lead times within 15 workdays.

Q:What package type is the SF1539 available in?

The IC is available in DIP8 packages.