Overview
The UCC28C43DR is a high-performance, low-power current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This device is part of the UCCx8C4x family, which offers enhanced performance and pin-to-pin compatibility with the industry-standard UCx84xA and UCx84x families. The UCC28C43DR is designed using BiCMOS technology, which provides lower power consumption and faster current sense and oscillator frequencies. It is suitable for high-speed applications and operates over a wide temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | –40 to 125 | °C |
| Maximum Operating Frequency | 1 | MHz |
| Startup Current | 50 µA | - |
| Maximum Operating Current | 100 µA | - |
| Operating Current at fOSC = 52kHz | 2.3 mA | - |
| Current-Sense-to-Output Delay | 35 ns | - |
| Peak Output Current | ±1 A | - |
| Rise Time | 25 ns | - |
| Fall Time | 20 ns | - |
| Error Amplifier Reference Voltage | ±1% accurate 2.5 V | - |
| Undervoltage Lockout (UVLO) | 8.4 V / 7.6 V | - |
Key Features
- Enhanced replacement for UCx84x and UCx84xA family with pin-to-pin compatibility.
- Low operating current: 2.3 mA at fOSC = 52 kHz.
- Fast, cycle-by-cycle overcurrent limiting with a 35 ns delay.
- 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.
- High-frequency operation up to 1 MHz.
- 100% duty cycle capability in certain configurations.
Applications
The UCC28C43DR is designed for use in fixed frequency, peak current-mode power supplies. It is particularly suitable for high-speed applications and can be used in a variety of power supply designs, including those requiring high efficiency and low power consumption. Typical applications include DC-DC converters, power supplies for industrial and consumer electronics, and battery-powered systems.
Q & A
- What is the operating temperature range of the UCC28C43DR?
The UCC28C43DR operates over a temperature range of –40°C to 125°C. - What is the maximum operating frequency of the UCC28C43DR?
The maximum operating frequency is up to 1 MHz. - What is the startup current of the UCC28C43DR?
The startup current is 50 µA. - What is the peak output current capability of the UCC28C43DR?
The peak output current capability is ±1 A. - What is the current-sense-to-output delay time of the UCC28C43DR?
The current-sense-to-output delay time is 35 ns. - What type of packages is the UCC28C43DR available in?
The UCC28C43DR is available in 8-pin SOIC (D) and 8-pin VSSOP (DGK) packages. - What is the error amplifier reference voltage accuracy of the UCC28C43DR?
The error amplifier reference voltage accuracy is ±1% accurate 2.5 V. - Does the UCC28C43DR support 100% duty cycle operation?
Yes, in certain configurations, the UCC28C43DR can operate near 100% duty cycle. - What are the typical applications of the UCC28C43DR?
Typical applications include DC-DC converters, power supplies for industrial and consumer electronics, and battery-powered systems. - What is the undervoltage lockout (UVLO) threshold for the UCC28C43DR?
The UVLO thresholds are 8.4 V and 7.6 V.
