Overview
The UC2844DTR is a single-ended current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCx84x family of control integrated circuits, designed to implement off-line and DC-to-DC fixed-frequency current-mode control schemes with a minimum number of external components. This device is optimized for use in switching regulators and transformer-coupled DC-DC converters, offering a range of features that enhance its performance and reliability.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 14 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Start-up Current | < 1 mA | - |
| Oscillator Frequency | Up to 500 kHz | - |
| Output Drive Current | ±1 A | - |
| Junction Temperature | 150 | °C |
| Reference Voltage | 4.95 to 5.05 V | - |
| Maximum Duty Cycle | Up to 50% | - |
Key Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 1 mA)
- Automatic feedforward compensation
- Pulse-by-pulse current limiting
- Enhanced load-response characteristics
- Undervoltage lockout with hysteresis
- Double-pulse suppression
- High-current totem-pole output
- Internally trimmed bandgap reference
- Error amplifier with low output resistance
Applications
- Switching regulators of any polarity
- Transformer-coupled DC-DC converters
- Off-line power supplies
- DC-DC applications
Q & A
- What is the operating temperature range of the UC2844DTR?
The UC2844DTR operates from -40°C to 85°C.
- What is the maximum oscillator frequency of the UC2844DTR?
The maximum oscillator frequency is up to 500 kHz.
- What is the start-up current of the UC2844DTR?
The start-up current is less than 1 mA.
- What type of output stage does the UC2844DTR have?
The UC2844DTR has a high-current totem-pole output stage designed to source or sink high-peak current.
- What are the key applications of the UC2844DTR?
The key applications include switching regulators, transformer-coupled DC-DC converters, off-line power supplies, and DC-DC applications.
- What is the reference voltage of the UC2844DTR?
The reference voltage is between 4.95 V and 5.05 V.
- Does the UC2844DTR have undervoltage lockout (UVLO) with hysteresis?
- What is the maximum duty cycle of the UC2844DTR?
The maximum duty cycle is up to 50%.
- What type of compensation does the UC2844DTR offer?
The UC2844DTR offers automatic feedforward compensation.
- Is the UC2844DTR suitable for driving N-channel MOSFETs?
