Overview
The UCC28C43DRG4 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 UCC28C43DRG4 is designed for operation in a wide temperature range from –40°C to 125°C, making it suitable for various industrial and high-reliability applications. It is available in an 8-pin SOIC (D) package, which minimizes board space and enhances thermal performance.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Operating Frequency | Up to 1 MHz | |
| Startup Current | 50 µA | |
| Maximum Operating Current | 100 µA | |
| Operating Current at fOSC = 52 kHz | 2.3 mA | |
| Current-Sense-to-Output Delay Time | 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 | |
| Maximum Duty Cycle | 100% | |
| Package Type | SOIC (D) - 8 pins | |
| Operating Temperature Range | –40°C to 125°C |
Key Features
- Enhanced Replacement: Pin-to-pin compatibility with the UCx84x and UCx84xA family of PWM controllers.
- High-Frequency Operation: Up to 1 MHz, suitable for high-speed applications.
- Low Power Consumption: Reduced startup and operating currents minimize start-up loss and low operating power consumption.
- Fast Current Sense: 35 ns current-sense-to-output delay time for superior overload protection.
- High Peak Output Current: ±1 A peak output current capability with improved rise and fall times for driving large external MOSFETs directly.
- Precise Oscillator Control: Trimmed oscillator discharge current for more precise programming of the maximum duty cycle and dead-time limit.
- Undervoltage Lockout Protections: 8.4 V / 7.6 V UVLO thresholds for reliable operation.
- Compact Packaging: Available in 8-pin SOIC (D) and VSSOP (DGK) packages to minimize board space.
Applications
- Fixed Frequency Power Supplies: Ideal for controlling peak current-mode power supplies.
- High-Speed Applications: Suitable for applications requiring high-frequency operation up to 1 MHz.
- Industrial Power Systems: Designed for operation in a wide temperature range, making it suitable for various industrial applications.
- Battery Systems: Lower startup voltage versions available for use in battery systems.
- High-Reliability Systems: Used in systems requiring high reliability and efficiency.
Q & A
- What is the operating frequency range of the UCC28C43DRG4?
The UCC28C43DRG4 operates up to a maximum frequency of 1 MHz.
- What is the startup current of the UCC28C43DRG4?
The startup current is 50 µA.
- What is the maximum operating current of the UCC28C43DRG4?
The maximum operating current is 100 µA.
- What is the current-sense-to-output delay time of the UCC28C43DRG4?
The current-sense-to-output delay time is 35 ns.
- What is the peak output current capability of the UCC28C43DRG4?
The peak output current capability is ±1 A.
- What are the rise and fall times of the UCC28C43DRG4?
The rise time is 25 ns, and the fall time is 20 ns.
- What is the error amplifier reference voltage of the UCC28C43DRG4?
The error amplifier reference voltage is ±1% accurate 2.5 V.
- What are the undervoltage lockout (UVLO) thresholds of the UCC28C43DRG4?
The UVLO thresholds are 8.4 V / 7.6 V.
- What is the maximum duty cycle of the UCC28C43DRG4?
The maximum duty cycle is 100%.
- In what package types is the UCC28C43DRG4 available?
The UCC28C43DRG4 is available in 8-pin SOIC (D) and VSSOP (DGK) packages.
