Overview
The UCC28C42DGKR is a high-performance, current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This device is part of the UCCx8C4x family, which offers enhanced replacements for the UCx84x and UCx84xA families with pin-for-pin compatibility. The UCC28C42DGKR is designed for use in fixed frequency, peak current-mode power supplies and is particularly suited for high-speed applications due to its high-frequency operation capabilities up to 1 MHz.
The device features BiCMOS technology, which provides lower power consumption and faster current sense and oscillator frequency compared to its predecessors. It is available in an 8-pin VSSOP (DGK) package, minimizing board space while offering robust performance.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | 8-pin VSSOP (DGK) | |
| Operating Temperature Range | -40°C to 125°C | °C |
| Startup Current | 50µA | A |
| Maximum Operating Current | 100µA | A |
| Operating Frequency | Up to 1 MHz | Hz |
| Peak Driving Current | ±1 A | A |
| Rise Time | 25 ns | ns |
| Fall Time | 20 ns | ns |
| Error Amplifier Reference | ±1% accurate 2.5 V | V |
| Undervoltage Lockout (UVLO) | 14.5 V / 9 V | V |
| Maximum Duty Cycle | 96% | % |
| Supply Voltage Range | 9 V to 18 V | V |
Key Features
- Enhanced replacement for UCx84x and UCx84xA family with pin-for-pin compatibility
- High-frequency operation up to 1 MHz, suitable for high-speed applications
- Low operating current: 2.3 mA (at fOSC = 52 kHz)
- Fast, cycle-by-cycle overcurrent limiting: 35 ns
- Peak driving current: ±1 A with rail-to-rail output
- Trimmed oscillator discharge current for precise duty cycle and dead-time limit programming
- Undervoltage lockout protections
- VSSOP-8 package minimizes board space
Applications
The UCC28C42DGKR is designed for use in various power supply applications, including:
- Fixed frequency, peak current-mode power supplies
- High-speed power conversion systems
- Battery-powered systems (with lower startup voltage versions like UCCx8C40 and UCCx8C41)
- Industrial and commercial power supplies requiring high efficiency and reliability
Q & A
- What is the operating temperature range of the UCC28C42DGKR?
The operating temperature range is -40°C to 125°C.
- What is the maximum operating frequency of the UCC28C42DGKR?
The maximum operating frequency is up to 1 MHz.
- What is the peak driving current capability of the UCC28C42DGKR?
The peak driving current capability is ±1 A.
- What is the rise and fall time of the UCC28C42DGKR?
The rise time is 25 ns and the fall time is 20 ns.
- Does the UCC28C42DGKR have undervoltage lockout protection?
Yes, it has undervoltage lockout protections with thresholds of 14.5 V and 9 V.
- What is the maximum duty cycle of the UCC28C42DGKR?
The maximum duty cycle is 96%.
- What is the supply voltage range for the UCC28C42DGKR?
The supply voltage range is from 9 V to 18 V.
- Is the UCC28C42DGKR RoHS compliant?
Yes, the UCC28C42DGKR is RoHS compliant.
- What package types are available for the UCC28C42DGKR?
The device is available in 8-pin VSSOP (DGK) and 8-pin SOIC (D) packages.[
- What are the key advantages of using the UCC28C42DGKR over its predecessors?
The key advantages include lower power consumption, faster current sense and oscillator frequency, and enhanced overcurrent protection.[
