Calculation tool
UCC28750-CALC — Excel calculator tool for the UCC28750 Flyback controller
The UCC28750 Excel calculator helps build the schematic design and accelerate the design process.
UCC28750
Current-mode flyback controller with secondary-side regulation (SSR) for offline applications
Data sheet
UCC28750
- Stable continuous conduction mode (CCM) operation with internal slope compensation
- Fixed-frequency operation of 65kHz or 100kHz
- Secondary-side regulation (SSR) with opto-coupler
- Frequency foldback and burst mode for improved light-load efficiency
- Frequency dithering for improved EMI performance
- Gate source/sink capability: 300mA/500mA
- Internal 4ms soft-start
- Robust protection features:
- Over-voltage and Under-voltage lockout
- Output over-power protection (OPP)
- Output short-circuit (OSC) protection
- Output over-voltage (OVP) protection
- Cycle-by-cycle peak over-current limit
- External over-temperature, over-voltage protection (OTP, OVP) and brownout detection on FLT pin
- Internal thermal shutdown
UCC28750 is a highly-integrated current-mode, continuous-conduction-capable, PWM controller optimized for high performance, low standby power, and cost effective offline flyback converter applications using an opto-coupler. During light-load conditions the device enters frequency foldback and burst modes, improving light-load efficiency. The burst-mode algorithm used in UCC28750 controls the minimum effective switching frequency to prevent audible noise during light-load conditions. Frequency dithering improves EMI performance, and is active in normal, frequency foldback, and power boost operations.
UCC28750 provides protection features that enable a robust converter design with minimal external components. Output over-power protection (OPP) and cycle-by-cycle over-current limit protect the load and power-stage components from electrical stress. Over-voltage and under-voltage lockout (OVLO and UVLO) prevent switching in unwanted input conditions. The FLT pin provides line brown-out sensing and protection, or external over-temperature and over-voltage protection, depending on the device variant. The FLT pin is also used to disable the device through external control by pulling the pin to ground, regardless of the device variant.
Technical documentation
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Evaluation board
UCC28750EVM-071 — UCC28750 evaluation module for current-mode flyback controller
The UCC28750EVM-071 is a 60-W evaluation module for evaluating an off-line AC to DC power converter. The UCC28750EVM-071 is intended for evaluation purposes and is not intended to be an end product. The UCC28750EVM-071 converts 85-VRMS to 265-VRMS input voltage down to 24 VDC, capable of delivering (...)
Simulation tool
UCC28750-SIMPLIS — UCC28750 Flyback Controller SIMPLIS Model
The UCC28750 SIMPLIS model helps build the schematic design and accelerates the design process.
Supported products & hardware
Products
AC/DC & DC/DC controllers (external FET)
Reference designs
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The Vienna rectifier power topology is used in high-power, three-phase power factor correction applications such as appliances, electric vehicle (EV) chargers, and telecom rectifiers. Control design of the rectifier can be complex. This reference design illustrates a method to control the power (...)
Design guide: PDF
Reference designs
PMP31288 — 7.8W wide AC input non-isolated high-side buck reference design
The is an ultra wide input offline high-side buck power supply reference design that provides an 13V output at a maximum of 0.6A. The input accepts a voltage range of 85 VAC to 485 VAC. The reference design uses the UCC28750 current-mode flyback controller with opto-coupler feedback. The design is (...)
Test report: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
Ordering & quality
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