Overview
The UC2844ADTRG4 is a single-ended current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This device is optimized for use in off-line and DC-DC converters, offering a range of features that make it suitable for various power supply applications. The UC2844ADTRG4 operates with a low start-up current of less than 0.5 mA and has a trimmed oscillator discharge current, ensuring stable and efficient operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 30 | V |
| Output Current (IOUT) | ±1 | A |
| Oscillator Frequency (fOSC) | 500 kHz | kHz |
| Operating Temperature Range | -40 to 85 | °C |
| UVLO Start Threshold | 16 V | V |
| UVLO Minimum Operation Voltage | 10 V | V |
| Maximum Duty Cycle | <50% | % |
| Output Voltage (VREF) | 4.95 to 5.05 | V |
| Error Amplifier Open-Loop Gain | 65 to 90 dB | dB |
Key Features
- Low start-up current of less than 0.5 mA
- Trimmed oscillator discharge current for stable operation
- Current-mode PWM control with a maximum duty cycle of less than 50%
- Under-voltage lockout (UVLO) with start threshold at 16 V and minimum operation voltage at 10 V
- Error amplifier with an open-loop gain of 65 to 90 dB
- Operating temperature range from -40°C to 85°C
- Available in various packages including PDIP, SOIC, and PLCC
Applications
The UC2844ADTRG4 is designed for use in off-line and DC-DC converters, making it suitable for a variety of power supply applications. These include:
- Switch-mode power supplies
- DC-DC converters
- Offline power supplies
- High-efficiency power conversion systems
Q & A
- What is the operating frequency of the UC2844ADTRG4?
The UC2844ADTRG4 operates at an oscillator frequency of 500 kHz.
- What is the maximum duty cycle of the UC2844ADTRG4?
The maximum duty cycle is less than 50%.
- What are the UVLO thresholds for the UC2844ADTRG4?
The start threshold is 16 V, and the minimum operation voltage is 10 V.
- What is the typical start-up current of the UC2844ADTRG4?
The start-up current is less than 0.5 mA.
- What is the operating temperature range of the UC2844ADTRG4?
The operating temperature range is from -40°C to 85°C.
- What types of packages are available for the UC2844ADTRG4?
The device is available in PDIP, SOIC, and PLCC packages.
- What is the open-loop gain of the error amplifier in the UC2844ADTRG4?
The open-loop gain of the error amplifier is 65 to 90 dB.
- What are some common applications for the UC2844ADTRG4?
Common applications include switch-mode power supplies, DC-DC converters, offline power supplies, and high-efficiency power conversion systems.
- How does the UC2844ADTRG4 handle under-voltage conditions?
The device features under-voltage lockout (UVLO) to prevent operation below the specified minimum voltage.
- What is the maximum output current of the UC2844ADTRG4?
The maximum output current is ±1 A.
