UCC384DPTR-12

UCC384DPTR-12 is TI’s UCC384D family current‑mode PWM controller in a PTR (tape‑and‑reel) packaging, reel size 12 units. It is an 8‑pin controller used to regulate switch‑mode power supplies (SMPS), especially flyback and related topologies.
Key points:
- External MOSFET driver: it does not include a power MOSFET; you must provide the high‑voltage startup path and the switching FET.
- Power topology support: suitable for off‑line SMPS and DC‑DC converters.
- Core features: high‑voltage startup from the high‑voltage rail, current‑mode control with slope compensation, adjustable oscillator frequency, overcurrent/short‑circuit protection, undervoltage lockout, soft‑start, and feedback input (via optocoupler or other error amp).
- Typical connections: startup resistor to Vcc, current sense input, feedback/compensation network, and gate drive to an external N‑channel MOSFET.
For exact pinout, electrical specs, and application notes, consult the TI UCC384D data sheet.

Equivalent products: TI’s UCC384x family is the direct cross. Specifically, UC3842/3843/3844/3845 and UCC3842/3843/3844/3845 are functionally equivalent current‑mode PWM controllers (same pinout; verify exact variant and package).

Here are the typical features of TI’s UCC384DPTR-12 (current‑mode PWM controller for off‑line SMPS, commonly used in flyback):
- High‑voltage startup with internal current source; supports rectified mains startup
- Current‑mode PWM control with slope compensation
- Leading‑edge blanking on current sense for noise rejection
- Programmable oscillator frequency via RT network (up to several hundred kHz)
- Soft‑start to limit inrush and control output ramp
- Undervoltage lockout (UVLO) for VCC
- Overcurrent protection with cycle‑by‑cycle limit
- Protection features (short/open‑circuit, thermal shutdown) for robustness
- Suitable for primary‑side regulation in offline converters
- 8‑pin package (suffix TR indicates tape & reel)
Note: exact voltage ranges, timing values, and protection modes may vary by revision; refer to the current datasheet for precise specifications.

- Pin count: 8 pins (DIP/SOIC package variants).
- Function: Current‑mode PWM controller for switched‑mode power supplies (e.g., flyback/forward converters); provides internal reference, oscillator, current-sense comparator, soft‑start/UVLO, and gate/drive output to switch the power transistor.

- Manufacturer: Texas Instruments (TI).
- What kind of company: TI is an American multinational semiconductor company that designs and manufactures analog and embedded processing integrated circuits and other electronics components.

UCC384DPTR-12 is a current‑mode PWM controller for switch‑mode power supplies. Typical application areas:
- Isolated offline flyback converters in AC‑DC adapters and wall‑wart supplies
- Auxiliary/standby power rails for consumer electronics (TVs, monitors, set‑top boxes, DVD/Blu‑ray players)
- Low‑ to mid‑power SMPS in telecom/AV equipment
- Battery-charger power supplies for portable devices
- Non‑isolated buck/boost SMPS implementations using an external MOSFET with current‑mode control
These cover general SMPS backgrounds where reliable current‑mode control and protections are beneficial.

An 8-pin Plastic DIP (DIP-8) package; PTR indicates the Tape & Reel version.