Overview
The UCC28C43DGKR 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 and is designed to be an enhanced replacement for the industry-standard UCx84x and UCx84xA families, offering pin-to-pin compatibility. The UCC28C43DGKR utilizes BiCMOS technology, which provides lower power consumption and faster current sense and oscillator frequency, improving overall efficiency.
This controller is specified for operation over a wide temperature range of -40°C to 125°C, making it suitable for various industrial and harsh environment applications. It features a compact VSSOP-8 package, which minimizes board space and enhances design flexibility.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-VSSOP (DGK) |
| Pins | 8 |
| Operating Temperature Range (°C) | -40 to 125 |
| Supply Voltage (V) | 7.6 to 20 |
| Maximum Operating Frequency | 1 MHz |
| Startup Current | 50 µA (typ), 100 µA (max) |
| Operating Current | 2.3 mA (at fOSC = 52 kHz) |
| Peak Driving Current | ±1 A |
| Rise Time | 25 ns |
| Fall Time | 20 ns |
| Error Amplifier Reference | ±1% accurate 2.5 V |
| Maximum Duty Cycle | 96% |
| Overcurrent Limiting Delay | 35 ns |
Key Features
- Enhanced replacement for UCx84x and UCx84xA family with pin-to-pin compatibility
- Low power consumption with 50 µA startup current and 2.3 mA operating current at 52 kHz
- Fast cycle-by-cycle overcurrent limiting with a delay of 35 ns
- Peak driving current of ±1 A with rail-to-rail output
- Fast rise and fall times of 25 ns and 20 ns respectively
- ±1% accurate 2.5 V error amplifier reference
- Trimmed oscillator discharge current for stable operation
- Undervoltage lockout protections for enhanced reliability
- Compact VSSOP-8 package to minimize board space
Applications
The UCC28C43DGKR is versatile and can be used in a variety of applications, including:
- DC-DC converters (boost, flyback, forward converters)
- Offline power supplies
- Battery-powered systems (especially the lower startup voltage versions)
- Industrial power supplies requiring high efficiency and reliability
- High-performance power management in harsh environment conditions
Q & A
- What is the operating temperature range of the UCC28C43DGKR?
The UCC28C43DGKR operates over a temperature range of -40°C to 125°C.
- What is the maximum operating frequency of the UCC28C43DGKR?
The maximum operating frequency is 1 MHz.
- What is the peak driving current capability of the UCC28C43DGKR?
The peak driving current is ±1 A.
- What is the rise and fall time of the output signal?
The rise time is 25 ns and the fall time is 20 ns.
- Does the UCC28C43DGKR support 100% duty cycle operation?
- What type of package does the UCC28C43DGKR come in?
The UCC28C43DGKR comes in an 8-pin VSSOP (DGK) package.
- What is the accuracy of the error amplifier reference voltage?
The error amplifier reference voltage is ±1% accurate at 2.5 V.
- What is the overcurrent limiting delay time?
The overcurrent limiting delay time is 35 ns.
- What are some common applications for the UCC28C43DGKR?
- Is the UCC28C43DGKR RoHS compliant?
