Overview
The UC2844D8 is a single-ended current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This integrated circuit is designed for use in off-line and DC-to-DC converters, offering a range of features that simplify the implementation of fixed-frequency current-mode control schemes with minimal external components.
The UC2844D8 operates within a temperature range of -40°C to 85°C and is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) package. It is optimized for high-performance switching applications, including boost, flyback, and forward topologies.
Key Specifications
| Parameter | Specification |
|---|---|
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Pins | 8 |
| Operating Temperature Range (°C) | -40 to 85 |
| Start-Up Voltage | 16V |
| Supply Voltage (Vcc/Vdd) | 10 V ~ 30 V |
| Duty Cycle | 48% |
| Switching Frequency | Up to 500kHz |
| Fault Protection | Current Limiting |
| Control Features | Frequency Control |
| Output Stage | High-Current Totem-Pole Output |
| Topology | Boost, Flyback, Forward |
Key Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 1mA)
- 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
The UC2844D8 is suitable for a variety of power conversion applications, including:
- Off-line power supplies
- DC-to-DC converters
- Boost, flyback, and forward converter topologies
- High-performance switching power supplies
Q & A
- What is the operating temperature range of the UC2844D8?
The UC2844D8 operates within a temperature range of -40°C to 85°C.
- What is the maximum switching frequency of the UC2844D8?
The UC2844D8 can operate up to a switching frequency of 500kHz.
- What are the typical applications of the UC2844D8?
The UC2844D8 is typically used in off-line power supplies, DC-to-DC converters, and other high-performance switching power supplies.
- What is the package type of the UC2844D8?
The UC2844D8 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) package.
- Does the UC2844D8 have built-in current limiting?
Yes, the UC2844D8 features pulse-by-pulse current limiting.
- What is the start-up voltage for the UC2844D8?
The start-up voltage for the UC2844D8 is 16V.
- Does the UC2844D8 have undervoltage lockout (UVLO) with hysteresis?
Yes, the UC2844D8 includes undervoltage lockout with hysteresis.
- What is the duty cycle of the UC2844D8?
The duty cycle of the UC2844D8 is 48%.
- Does the UC2844D8 support multiple topologies?
Yes, the UC2844D8 supports boost, flyback, and forward converter topologies.
- What is the typical start-up current of the UC2844D8?
The start-up current of the UC2844D8 is less than 1mA.
