Overview
The UC2845D8TR is a single-ended current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This integrated circuit is part of the UCx84x family, which is optimized for off-line and DC-to-DC converters. The UC2845D8TR operates within a temperature range of -40°C to 85°C and is packaged in an 8-pin SOIC (D) package. It features a low start-up current of less than 1 mA and includes an undervoltage lockout (UVLO) with hysteresis, making it suitable for a variety of power supply applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Maximum Duty Cycle | Up to 50% | - |
| UVLO Thresholds | 8.4V (on), 7.6V (off) | V |
| Switching Frequency | Up to 500 kHz | - |
| Start-up Current | < 1 mA | - |
| Output Drive Current | ±1 A | - |
| Reference Output Voltage | 4.95 to 5.05 V | V |
| Junction Temperature | -150 °C | °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 with specific hysteresis ranges
Q & A
- What is the operating temperature range of the UC2845D8TR?
The UC2845D8TR operates within a temperature range of -40°C to 85°C.
- What is the maximum switching frequency of the UC2845D8TR?
The UC2845D8TR can operate up to a switching frequency of 500 kHz.
- What are the UVLO thresholds for the UC2845D8TR?
The UVLO thresholds for the UC2845D8TR are 8.4V (on) and 7.6V (off).
- What is the start-up current of the UC2845D8TR?
The start-up current of the UC2845D8TR is less than 1 mA.
- What type of output stage does the UC2845D8TR have?
The UC2845D8TR has a high-current totem-pole output stage designed to source or sink high-peak current.
- What are some common applications for the UC2845D8TR?
Common applications include switching regulators, transformer-coupled DC-DC converters, off-line power supplies, and DC-DC converters.
- What is the package type and pin count of the UC2845D8TR?
The UC2845D8TR is packaged in an 8-pin SOIC (D) package.
- Does the UC2845D8TR have an internally trimmed bandgap reference?
Yes, the UC2845D8TR includes an internally trimmed bandgap reference.
- What is the maximum output drive current of the UC2845D8TR?
The maximum output drive current of the UC2845D8TR is ±1 A.
- Does the UC2845D8TR support pulse-by-pulse current limiting?
Yes, the UC2845D8TR supports pulse-by-pulse current limiting.
