Basic Product Information
Part Number: OB3330XCPA
Core Electrical Parameters
| Parameter |
Value |
Unit |
| Topology |
Flyback with Single-Stage PFC |
– |
| Control Method |
Primary-Side Regulation (PSR) |
– |
| Switching Frequency |
300 |
kHz |
| VCC Operating Range |
11 to 25 |
V |
| VCC UVLO Turn-On |
14.6 (typ) |
V |
| VCC UVLO Hysteresis |
5.6 (typ) |
V |
| VCC OVP Threshold |
30 |
V |
| VCC Clamp |
35 |
V |
| VCC Absolute Max |
40 |
V |
| Start-up Current |
5 (typ) |
μA |
| Gate Drive Output Clamp |
11 |
V |
| External MOSFET Drive |
Totem-pole output |
– |
| OCP Threshold |
Selectable (cycle-by-cycle) |
– |
| Operating Ambient Temperature |
-20 to +85 |
°C |
| Operating Junction Temperature |
-40 to +150 |
°C |
| Package Dimensions |
4.70 x 3.80 |
mm |
Core Features & Advantages
The OB3330XCPA delivers high power factor and precise LED current regulation in a single-stage flyback topology without requiring an optocoupler or secondary-side reference.
- Primary Function: Primary-side-controlled, high-PF LED lighting driver with integrated analog multiplier for single-stage power factor correction.
- Advantages:
- No optocoupler or TL431 required — primary-side sensing eliminates isolated feedback components, reducing BOM cost and improving reliability.
- Single-stage PFC + constant current — transition-mode (TM) operation with built-in analog multiplier achieves high power factor while maintaining tight LED current accuracy.
- Comprehensive protection suite — VCC UVLO/OVP, output OVP, cycle-by-cycle OCP with selectable threshold, OTP, LED open/short circuit protection, and gate clamp for external MOSFET safety.
Typical Application Scenarios
- Industry: LED Lighting / Industrial / Commercial
- Equipment: LED bulb drivers, tube light drivers, downlight drivers, panel light power supplies
- Use Cases:
- Residential LED bulb and tube light drivers (5W–40W) requiring high PF compliance and compact BOM.
- Commercial downlight and panel light drivers with tight current regulation and flicker-free dimming.
- Industrial LED fixture power supplies needing robust protection (OVP, OCP, OTP, open/short) in harsh environments.
Market Reference Price
| Market |
Price Range |
Currency |
| Huaqiangbei Spot |
$0.25 – $0.45 |
USD |
| Overseas B2B |
$0.30 – $0.59 |
USD |
Related Models Comparison
| Model |
Difference |
Application |
| OB3330CP |
Same die in SOP-8 tube package (OB3330XCPA is tape & reel); electrically identical |
Same LED driver applications, manual placement |
| OB3330X |
Extended version with additional high-PF features and wider input range |
Higher-power LED drivers with stricter PF requirements |
| OB2269CPA |
Non-PFC PSR flyback controller, lower cost but no power factor correction |
Low-power (<10W) LED drivers without PF requirement |
