Overview
The UCC28C42DR 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 replacements for the UCx84x and UCx84xA families with pin-to-pin compatibility. The UCC28C42DR is designed for industrial applications, operating over a wide temperature range from -40°C to 125°C. It features BiCMOS technology, which provides lower power consumption, faster current sense, and higher oscillator frequencies, making it suitable for high-speed applications.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Operating Frequency | - | - | 1 MHz | - |
| Startup Current | 50 µA | - | 100 µA | - |
| Operating Current (at fOSC = 52kHz) | - | 2.3 mA | - | - |
| Current-Sense-to-Output Delay | 35 ns | - | 70 ns | - |
| Peak Output Current | - | - | ±1 A | - |
| Rise Time (TJ = 25°C, COUT = 1nF) | 25 ns | - | 50 ns | - |
| Fall Time (TJ = 25°C, COUT = 1nF) | 20 ns | - | 40 ns | - |
| Undervoltage Lockout Start Threshold | 13.5 V | 14.5 V | 15.5 V | - |
| Operating Temperature Range | -40°C | - | 125°C | - |
| Package Type | - | - | SOIC (D) - 8 pins | - |
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 operating current: 2.3 mA (at fOSC = 52kHz) and startup current of 50 µA.
- Fast, cycle-by-cycle overcurrent limiting with a 35 ns current-sense-to-output delay.
- Peak driving current: ±1 A with rail-to-rail output.
- Trimmed oscillator discharge current for precise programming of maximum duty cycle and dead-time limit.
- Undervoltage lockout protections with start thresholds of 13.5 V to 15.5 V.
- ±1% accurate 2.5 V error amplifier reference.
- Available in 8-pin SOIC (D) and VSSOP (DGK) packages.
Applications
The UCC28C42DR is designed for use in various power supply applications, including:
- Fixed frequency, peak current-mode power supplies.
- High-speed power conversion systems.
- Industrial power supplies requiring high reliability and efficiency.
- Battery-powered systems, especially with the lower startup voltage versions (UCCx8C40 and UCCx8C41).
Q & A
- What is the maximum operating frequency of the UCC28C42DR?
The maximum operating frequency is 1 MHz.
- What is the startup current of the UCC28C42DR?
The startup current is 50 µA.
- What is the typical operating current at 52 kHz oscillator frequency?
The typical operating current is 2.3 mA.
- What is the current-sense-to-output delay time?
The current-sense-to-output delay time is 35 ns.
- What is the peak output current capability of the UCC28C42DR?
The peak output current capability is ±1 A.
- What are the rise and fall times of the output signal?
The rise time is 25 ns to 50 ns, and the fall time is 20 ns to 40 ns at TJ = 25°C and COUT = 1nF.
- What is the undervoltage lockout start threshold for the UCC28C42DR?
The undervoltage lockout start threshold is between 13.5 V and 15.5 V.
- What are the available package types for the UCC28C42DR?
The device is available in 8-pin SOIC (D) and VSSOP (DGK) packages.
- What is the operating temperature range of the UCC28C42DR?
The operating temperature range is from -40°C to 125°C.
- What is the accuracy of the error amplifier reference voltage?
The error amplifier reference voltage is accurate to ±1% at 2.5 V.
