Overview
The UC2844D8TR is a high-performance current-mode PWM controller produced by Texas Instruments. It is part of the UCx84x series, which is optimized for off-line and DC-to-DC converter applications. This device is designed to provide a cost-effective solution with a minimal number of external components. The UC2844D8TR features an internally trimmed bandgap reference, a high-gain error amplifier, and a high-current totem-pole output stage suitable for driving N-channel MOSFETs. It operates within a temperature range of -40°C to 85°C and is available in an 8-pin SOIC (D) package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Maximum Duty Cycle | 50% | - |
| Output Current (Source or Sink) | 1.0 | A |
| Output Energy (Capacitive Load per Cycle) | 5.0 | mJ |
| Startup Threshold | 15 to 17 | V |
| Minimum Operating Voltage After Turn-On | 9.0 to 11 | V |
| Reference Output Voltage | 4.95 to 5.05 | V |
| Unity Gain Bandwidth | 0.7 to 1.0 | MHz |
| Power Supply Rejection Ratio | 60 to 70 | dB |
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 UC2844D8TR?
The UC2844D8TR operates within a temperature range of -40°C to 85°C.
- What is the maximum duty cycle of the UC2844D8TR?
The maximum duty cycle of the UC2844D8TR is 50%.
- What is the startup current of the UC2844D8TR?
The startup current of the UC2844D8TR is less than 1 mA.
- What type of output stage does the UC2844D8TR have?
The UC2844D8TR has a high-current totem-pole output stage suitable for driving N-channel MOSFETs.
- What is the reference output voltage of the UC2844D8TR?
The reference output voltage of the UC2844D8TR is between 4.95 V and 5.05 V.
- Does the UC2844D8TR have undervoltage lockout (UVLO) with hysteresis?
Yes, the UC2844D8TR features undervoltage lockout (UVLO) with hysteresis.
- What is the maximum output current of the UC2844D8TR?
The maximum output current of the UC2844D8TR is 1.0 A.
- What is the package type and pin count of the UC2844D8TR?
The UC2844D8TR is available in an 8-pin SOIC (D) package.
- What are some of the protective features of the UC2844D8TR?
The UC2844D8TR includes protective features such as cycle-by-cycle current limiting, double-pulse suppression, and undervoltage lockout with hysteresis.
- What is the unity gain bandwidth of the error amplifier in the UC2844D8TR?
The unity gain bandwidth of the error amplifier in the UC2844D8TR is between 0.7 MHz and 1.0 MHz.
