Overview
The UC2844AN is a current-mode PWM controller from Texas Instruments, designed for use in off-line and DC-DC converters. It is part of the UCx84xA family, which offers improved features over its predecessors. This device is optimized for high-performance power supply applications, providing low start-up current, trimmed oscillator discharge current, and enhanced load response characteristics.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | PDIP (P) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40°C to 85°C | °C |
| Maximum Duty Cycle | < 50% | % |
| UVLO Start Threshold | 16 V | V |
| UVLO Minimum Operation Voltage After Turn-On | 10 V | V |
| Output Voltage (VCC = 15 V, IO = 1 mA) | 4.95 - 5.05 | V |
| Output Current (Totem Pole Gate Driver) | Up to 1 A | A |
| Oscillator Frequency | Up to 500 kHz | kHz |
Key Features
- Optimized for off-line and DC-DC converters
- Low start-up current (< 0.5 mA)
- Trimmed oscillator discharge current
- 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
Applications
- Switch-mode power supplies (SMPS)
- DC-DC converters
- Power modules
- Industrial power supplies (PSU)
- Battery-operated power supplies (PSU)
Q & A
- What is the UC2844AN used for?
The UC2844AN is used for controlling current-mode or switched-mode power supplies, particularly in off-line and DC-DC converters.
- What is the operating temperature range of the UC2844AN?
The operating temperature range is -40°C to 85°C.
- What is the maximum duty cycle of the UC2844AN?
The maximum duty cycle is less than 50%.
- What is the UVLO start threshold for the UC2844AN?
The UVLO start threshold is 16 V.
- What is the output current capability of the totem pole gate driver?
The output current capability is up to 1 A.
- What is the oscillator frequency range of the UC2844AN?
The oscillator frequency range is up to 500 kHz.
- Does the UC2844AN have undervoltage lockout (UVLO) with hysteresis?
- What are some common applications of the UC2844AN?
- How does the UC2844AN handle pulse-by-pulse current limiting?
The UC2844AN includes pulse-by-pulse current limiting to ensure safe and stable operation.
- Is the UC2844AN compatible with other devices in the UCx84xA family?
