Overview
The UCC28C44DGKR is a high-performance current-mode PWM (Pulse Width Modulation) controller designed by Texas Instruments. This device is part of the UCC28C4x family, which offers enhanced performance and pin-to-pin compatibility with the industry-standard UCx84x and UCx84xA families. The UCC28C44DGKR is optimized for use in off-line power supplies, including AC-DC converters, DC-DC converters, LED drivers, and motor control circuits. It features a compact 8-pin VSSOP package, making it versatile for various design applications.
Key Specifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| 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 | Operating Temperature Range (°C) | -40 to 125 |
| Gate Drive (typ) (A) | ±1 | Rise Time (ns) | 25 |
| Fall Time (ns) | 20 | Error Amplifier Reference Accuracy | ±1% (2.5V) |
| Package | VSSOP-8 (DGK) | Startup Current | 50µA |
| Operating Current | 2.3mA (at fOSC = 52kHz) | Overcurrent Limiting Delay | 35ns |
Key Features
- Programmable soft start reduces inrush current
- Adaptive on-time control optimizes power usage
- Internal UVLO (Undervoltage Lockout) prevents overvoltage damage
- Peak current mode control for constant frequency operation
- Wide input voltage range of 4.5V to 28V
- Integrated high voltage startup and oscillator for simplified design
- Adjustable switching frequency and dead time control
- Error amplifier and multi-topology support
- Fast, cycle-by-cycle overcurrent limiting
- ±1A peak output current capability with improved rise and fall times
Applications
The UCC28C44DGKR is commonly used in various power management applications, including:
- AC-DC converters
- DC-DC converters
- LED drivers
- Motor control circuits
- Power adapters and chargers
- LED lighting systems
Q & A
- What is the UCC28C44DGKR?
The UCC28C44DGKR is a high-performance current-mode PWM controller designed for off-line power supplies.
- What package type does the UCC28C44DGKR use?
The UCC28C44DGKR is housed in an 8-pin VSSOP (DGK) package.
- What is the operating temperature range of the UCC28C44DGKR?
The operating temperature range is -40°C to 125°C.
- What is the maximum switching frequency of the UCC28C44DGKR?
The maximum switching frequency is 1000 kHz.
- Does the UCC28C44DGKR support multiple topologies?
Yes, it supports Boost, Buck, Flyback, Forward, and SEPIC topologies.
- What is the UVLO threshold for the UCC28C44DGKR?
The UVLO thresholds are 14.5V for start and 9V for shutdown.
- What is the peak output current capability of the UCC28C44DGKR?
The peak output current capability is ±1A.
- Does the UCC28C44DGKR have overcurrent protection?
Yes, it features fast, cycle-by-cycle overcurrent limiting.
- What is the startup current of the UCC28C44DGKR?
The startup current is 50µA.
- Is the UCC28C44DGKR RoHS compliant?
Yes, the UCC28C44DGKR is RoHS compliant.
