Overview
The UCC28C42DGK is a high-performance, current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments, originally developed by Unitrode. This device is part of the UCCx8C4x family, which offers enhanced replacements for the UCx84x and UCx84xA families with pin-to-pin compatibility. The UCC28C42DGK is designed for use in fixed frequency, peak current-mode power supplies and is known for its low power consumption and high efficiency.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Operating Frequency | - | - | 1 MHz | - |
| Startup Current | - | 50 µA | 100 µA | - |
| Operating Current (at fOSC = 52kHz) | - | - | 2.3 mA | - |
| Peak Driving Current | - | - | ±1 A | - |
| Rise Time (TJ = 25°C, CLOAD = 1 nF) | 25 ns | - | 50 ns | - |
| Fall Time (TJ = 25°C, CLOAD = 1 nF) | 20 ns | - | 40 ns | - |
| Undervoltage Lockout Start Threshold | 13.5 V | 14.5 V | 15.5 V | - |
| Minimum Operating Voltage | 8 V | 9 V | 10 V | - |
| Maximum Duty Cycle (VFB < 2.4 V) | - | - | 100% | - |
| Operating Temperature Range | -40°C | - | 125°C | - |
| Package Type | - | - | VSSOP (DGK) 8-pin | - |
Key Features
- Enhanced replacement for UCx84x and UCx84xA family with pin-to-pin compatibility
- Operating frequency up to 1 MHz, suitable for high-speed applications
- Low startup current (50 µA) and low operating current (2.3 mA at fOSC = 52kHz)
- Fast current-sense-to-output delay time of 35 ns for superior overload protection
- Peak driving current of ±1 A with improved rise and fall times
- ±1% accurate 2.5V error amplifier reference
- Trimmed oscillator discharge current for precise programming of maximum duty cycle and dead-time limit
- Undervoltage lockout protections with start thresholds of 14.5V and minimum operating voltage of 9V
- VSSOP-8 package minimizes board space
Applications
The UCC28C42DGK 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 (lower startup voltage versions available)
- Industrial power supplies requiring high efficiency and low power consumption
Q & A
- What is the operating frequency range of the UCC28C42DGK?
The UCC28C42DGK can operate up to a maximum frequency of 1 MHz.
- What is the startup current of the UCC28C42DGK?
The startup current is 50 µA.
- What is the typical operating current at 52 kHz oscillator frequency?
The typical operating current is 2.3 mA.
- What is the peak driving current capability of the UCC28C42DGK?
The peak driving current is ±1 A.
- What is the rise and fall time of the output signal?
The rise time is 25 ns to 50 ns, and the fall time is 20 ns to 40 ns.
- What is the undervoltage lockout start threshold for the UCC28C42DGK?
The undervoltage lockout start threshold is between 13.5 V and 15.5 V.
- What is the minimum operating voltage for the UCC28C42DGK?
The minimum operating voltage is between 8 V and 10 V.
- What is the maximum duty cycle of the UCC28C42DGK?
The maximum duty cycle is 100%.
- What is the operating temperature range of the UCC28C42DGK?
The operating temperature range is from -40°C to 125°C.
- In what package is the UCC28C42DGK available?
The UCC28C42DGK is available in an 8-pin VSSOP (DGK) package.
