Overview
The UCC28C44DR is a high-performance, low-power current-mode PWM (Pulse Width Modulation) controller manufactured by Texas Instruments. This device is part of the UCCx8C4x family, which offers enhanced performance and pin-to-pin compatibility with the industry-standard UCx84xA and UCx84x families of PWM controllers. The UCC28C44DR is designed for use in various power supply applications, including offline AC-to-DC converters, LED drivers, and industrial power supplies. It features BiCMOS technology, which provides lower power consumption and faster current sense and oscillator frequency, making it suitable for high-speed applications.
Key Specifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Package | SOIC-8 | Operating Temperature Range (°C) | -40 to 125 |
| Regulator Topology | Boost, Buck, Flyback, Forward, SEPIC | Control Mode | Current |
| Duty Cycle (max) (%) | 50 | Switching Frequency (max) (kHz) | 1000 |
| UVLO Thresholds On/Off (V) | 14.5/9 | Gate Drive (typ) (A) | ±1 |
| Startup Current | 50µA | Maximum Operating Current | 100µA |
| Operating Current at fOSC = 52kHz | 2.3mA | Current Sense to Output Delay | 35ns |
| Rise Time | 25ns | Fall Time | 20ns |
| Error Amplifier Reference Accuracy | ±1% at 2.5V | Oscillator Frequency | Up to 1MHz |
Key Features
- Enhanced replacement for UCx84x and UCx84xA family with pin-to-pin compatibility
- High-frequency operation up to 1 MHz, suitable for high-speed applications
- Low startup current of 50µA and maximum operating current of 100µA
- Low operating current of 2.3mA at fOSC = 52kHz
- Fast cycle-by-cycle overcurrent limiting with a delay time of 35ns
- Peak driving current of ±1A with rail-to-rail output
- Trimmed oscillator discharge current for precise duty cycle and dead-time control
- Undervoltage lockout protections with thresholds of 14.5V and 9V
- Adjustable switching frequency and programmable maximum duty cycle
- Soft-start functionality and low power standby mode
- Available in SOIC-8 package, minimizing board space
Applications
The UCC28C44DR is versatile and can be used in a variety of power supply applications, including:
- Offline AC-to-DC converters
- LED drivers
- Industrial power supplies
- Battery chargers
- DC-DC converters
- Telecommunications equipment
Q & A
- What is the UCC28C44DR?
The UCC28C44DR is a high-performance, low-power current-mode PWM controller manufactured by Texas Instruments.
- What are the key features of the UCC28C44DR?
Key features include high-frequency operation up to 1 MHz, low startup and operating currents, fast cycle-by-cycle overcurrent limiting, and adjustable switching frequency.
- What are the typical applications of the UCC28C44DR?
Typical applications include offline AC-to-DC converters, LED drivers, industrial power supplies, battery chargers, DC-DC converters, and telecommunications equipment.
- What is the operating temperature range of the UCC28C44DR?
The operating temperature range is -40°C to 125°C.
- What is the maximum switching frequency of the UCC28C44DR?
The maximum switching frequency is 1 MHz.
- What is the maximum duty cycle of the UCC28C44DR?
The maximum duty cycle is 50%.
- What are the UVLO thresholds for the UCC28C44DR?
The UVLO thresholds are 14.5V and 9V.
- What is the typical gate drive current of the UCC28C44DR?
The typical gate drive current is ±1A.
- Is the UCC28C44DR RoHS compliant?
Yes, the UCC28C44DR is RoHS compliant.
- In what package is the UCC28C44DR available?
The UCC28C44DR is available in an 8-pin SOIC (D) package.
