Overview
The UCC28C43P is a high-performance, current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCCx8C4x family, which offers enhanced replacements for the industry-standard UCx84x and UCx84xA families with pin-to-pin compatibility. This BiCMOS device is designed to control fixed-frequency, peak current-mode power supplies, offering significant improvements in power consumption and efficiency.
The UCC28C43P is particularly suited for high-speed applications, with an operating frequency up to 1 MHz. It features low startup and operating currents, minimizing startup loss and reducing overall power consumption. The device is available in an 8-pin SOIC (D) package, which minimizes board space.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage (VDD) | - | - | 20 | V |
| Startup Current | - | 50 μA | 100 μA | A |
| Operating Current (at fOSC = 52 kHz) | - | 2.3 mA | - | A |
| Operating Frequency | - | - | 1 MHz | Hz |
| Peak Output Current | - | - | ±1 A | A |
| Rise Time (TJ = 25°C, COUT = 1 nF) | 25 ns | - | 50 ns | ns |
| Fall Time (TJ = 25°C, COUT = 1 nF) | 20 ns | - | 40 ns | ns |
| Error Amplifier Reference Voltage | 4.9 V | 5 V | 5.1 V | V |
| Current Sense to Output Delay | 35 ns | - | 70 ns | ns |
| Maximum Duty Cycle (VFB < 2.4 V) | - | - | 96% | % |
| Undervoltage Lockout (Start Threshold) | 7.8 V | 8.4 V | 9 V | V |
| Undervoltage Lockout (Minimum Operating Voltage) | 7 V | 7.6 V | 8.2 V | V |
| Operating Temperature Range | -40°C | - | 125°C | °C |
Key Features
- High-Frequency Operation: Up to 1 MHz, suitable for high-speed applications.
- Low Power Consumption: Low startup current (50 μA) and operating current (2.3 mA at fOSC = 52 kHz) to minimize startup loss and improve efficiency.
- Fast Current-Sense-to-Output Delay: 35 ns for superior overload protection at the power switch.
- Peak Output Current Capability: ±1 A with improved rise and fall times for driving large external MOSFETs directly.
- Precision Error Amplifier Reference: ±1% accurate 2.5 V error amplifier reference voltage.
- Trimmed Oscillator Discharge Current: Enables more precise programming of the maximum duty cycle and dead-time limit.
- Undervoltage Lockout Protections: Multiple versions with different start and stop thresholds for various applications.
- Compact Packaging: Available in 8-pin SOIC (D) and VSSOP (DGK) packages to minimize board space.
Applications
- Switch-Mode Power Supplies: Ideal for designing efficient and high-performance power supplies.
- DC-DC Converters: Suitable for both general-purpose single-ended DC-DC and off-line isolated power converters.
- Board Mount Power Modules: Used in various board mount power modules for compact and efficient power solutions.
- Battery Systems: Lower startup voltage versions (e.g., UCC28C40, UCC28C41) are designed for use in battery systems.
Q & A
- What is the maximum operating frequency of the UCC28C43P?
The maximum operating frequency is up to 1 MHz.
- What is the startup current of the UCC28C43P?
The startup current is 50 μA.
- What is the peak output current capability of the UCC28C43P?
The peak output current capability is ±1 A.
- What is the accuracy of the error amplifier reference voltage?
The error amplifier reference voltage has an accuracy of ±1% at 2.5 V.
- What is the current sense to output delay time?
The current sense to output delay time is 35 ns.
- What are the typical operating temperatures for the UCC28C43P?
The operating temperature range is from -40°C to 125°C.
- What types of packages are available for the UCC28C43P?
The device is available in 8-pin SOIC (D) and VSSOP (DGK) packages.
- What are some common applications for the UCC28C43P?
Common applications include switch-mode power supplies, DC-DC converters, and board mount power modules.
- Does the UCC28C43P have undervoltage lockout protections?
Yes, it has multiple versions with different start and stop thresholds for undervoltage lockout protections.
- How does the UCC28C43P improve efficiency in power supplies?
The device improves efficiency through low startup and operating currents, and high-frequency operation, which minimizes startup loss and reduces overall power consumption.
