Overview
The UCC28C42DRG4 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 BiCMOS versions with pin-to-pin compatibility to the industry standard UCx84xA and UCx84x families of PWM controllers. The BiCMOS technology provides lower power consumption, improved efficiency, and faster current sense and oscillator frequency. The UCC28C42DRG4 is designed for controlling fixed frequency, peak current-mode power supplies and is suitable for high-speed applications.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Package Type | SOIC (D), VSSOP (DGK) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Operating Frequency | Up to 1 MHz | - |
| Startup Current | 50 µA (typ), 100 µA (max) | µA |
| Operating Current | 2.3 mA (at fOSC = 52 kHz) | mA |
| Current-Sense-to-Output Delay Time | 35 ns | ns |
| Peak Output 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 / 9.0 V | V |
Key Features
- Enhanced replacement for UCx84x and UCx84xA family with pin-to-pin compatibility
- High-frequency operation up to 1 MHz
- Low startup current (50 µA typical, 100 µA maximum) and low operating current (2.3 mA at fOSC = 52 kHz)
- Fast, cycle-by-cycle overcurrent limiting with a delay time of 35 ns
- Peak driving current of ±1 A with rail-to-rail output
- Fast rise and fall times (25 ns and 20 ns respectively)
- ±1% accurate 2.5 V error amplifier reference
- Trimmed oscillator discharge current for precise duty cycle and dead-time programming
- Undervoltage lockout protections
- Compact 8-pin SOIC (D) and VSSOP (DGK) packages to minimize board space
Applications
The UCC28C42DRG4 is suitable for various high-performance 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 power supplies requiring high efficiency and reliability
- Applications needing precise control over duty cycle and dead-time
Q & A
- What is the operating temperature range of the UCC28C42DRG4?
The operating temperature range is from -40°C to 125°C.
- What is the maximum operating frequency of the UCC28C42DRG4?
The maximum operating frequency is up to 1 MHz.
- What is the typical startup current of the UCC28C42DRG4?
The typical startup current is 50 µA, with a maximum of 100 µA.
- What is the peak output current capability of the UCC28C42DRG4?
The peak output current capability is ±1 A.
- What are the rise and fall times of the UCC28C42DRG4?
The rise time is 25 ns, and the fall time is 20 ns.
- Does the UCC28C42DRG4 have undervoltage lockout protection?
- In what packages is the UCC28C42DRG4 available?
- What is the accuracy of the error amplifier reference in the UCC28C42DRG4?
- Is the UCC28C42DRG4 compatible with older UCx84x and UCx84xA families?
- What is the current-sense-to-output delay time of the UCC28C42DRG4?
