Overview
The UCC28C45DRG4 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 industry-standard UCx84x and UCx84xA families with pin-to-pin compatibility. The UCC28C45DRG4 is designed using BiCMOS technology, which provides lower power consumption, faster current sense, and higher oscillator frequency. It is suitable for controlling fixed-frequency, peak current-mode power supplies and is particularly useful in high-speed applications.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| 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 |
| 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 |
| Operating Temperature Range | -40°C to 125°C | °C |
| Package Type | 8-pin SOIC (D), 8-pin VSSOP (DGK) | |
| Current Sense to Output Delay Time | 35 ns | ns |
Key Features
- Enhanced replacement for UCx84x and UCx84xA family with pin-to-pin compatibility
- High-frequency operation up to 1 MHz, suitable for high-speed applications
- Low startup current (50 µA typical, 100 µA maximum) and low operating current (2.3 mA at fOSC = 52 kHz)
- Fast current-sense-to-output delay time of 35 ns for superior overload protection
- ±1 A peak output current capability with improved rise and fall times for driving large external MOSFETs directly
- Trimmed oscillator discharge current for precise programming of maximum duty cycle and dead-time limit
- Undervoltage lockout protections
- Compact 8-pin VSSOP (DGK) and SOIC (D) packages to minimize board space
Applications
The UCC28C45DRG4 is designed for use in various power supply applications, including:
- AC-DC and DC-DC fixed-frequency current-mode power supplies
- High-speed power conversion systems
- Battery-powered systems, especially with the lower startup voltage versions (UCCx8C40 and UCCx8C41)
- Industrial and consumer electronics requiring efficient and reliable power management
Q & A
- What is the operating frequency range of the UCC28C45DRG4?
The UCC28C45DRG4 operates at frequencies up to 1 MHz.
- What is the typical startup current of the UCC28C45DRG4?
The typical startup current is 50 µA, with a maximum of 100 µA.
- What is the peak driving current capability of the UCC28C45DRG4?
The device can drive up to ±1 A peak output current.
- What is the current sense to output delay time of the UCC28C45DRG4?
The current sense to output delay time is 35 ns.
- What are the available package types for the UCC28C45DRG4?
The device is available in 8-pin SOIC (D) and 8-pin VSSOP (DGK) packages.
- What is the operating temperature range of the UCC28C45DRG4?
The operating temperature range is -40°C to 125°C.
- Does the UCC28C45DRG4 have undervoltage lockout protection?
- What is the accuracy of the error amplifier reference in the UCC28C45DRG4?
The error amplifier reference is ±1% accurate at 2.5 V.
- Can the UCC28C45DRG4 be used in battery-powered systems?
- What are the typical rise and fall times of the UCC28C45DRG4?
The typical rise time is 25 ns, and the typical fall time is 20 ns.
