Overview
The UC2844NG4 is a single-ended current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCx84x series of control integrated circuits, designed to implement off-line and DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. The 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 | PDIP (P) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Input Voltage | Up to 30 | V |
| Start-up Current | < 1 mA | - |
| Oscillator Frequency | 100 to 500 kHz | - |
| Output Drive Current | ±1 A | - |
| Reference Voltage | 4.95 to 5.05 V | - |
| Junction Temperature | 150 | °C |
| Storage Temperature | -65 to 150 | °C |
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
- Up to 500 kHz operation
- Error amplifier with low output resistance
Applications
- Switching regulators of any polarity
- Transformer-coupled DC-DC converters
- Off-line power supplies
- DC-DC converters
Q & A
- What is the operating temperature range of the UC2844NG4?
The UC2844NG4 operates from -40°C to 85°C. - What is the maximum input voltage for the UC2844NG4?
The maximum input voltage is up to 30 V. - What is the start-up current of the UC2844NG4?
The start-up current is less than 1 mA. - What is the oscillator frequency range of the UC2844NG4?
The oscillator frequency range is from 100 kHz to 500 kHz. - What type of output stage does the UC2844NG4 have?
The UC2844NG4 has a high-current totem-pole output stage. - What is the reference voltage of the UC2844NG4?
The reference voltage is between 4.95 V and 5.05 V. - What are the key applications of the UC2844NG4?
The key applications include switching regulators, transformer-coupled DC-DC converters, off-line power supplies, and DC-DC converters. - Does the UC2844NG4 have undervoltage lockout (UVLO) with hysteresis?
Yes, the UC2844NG4 features undervoltage lockout with hysteresis. - What is the maximum output drive current of the UC2844NG4?
The maximum output drive current is ±1 A. - What is the junction temperature limit for the UC2844NG4?
The junction temperature limit is 150°C.
