Overview
The UC3845D8TR 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 designed to implement off-line and DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. The UC3845D8TR operates within a temperature range of 0°C to 70°C and is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) package.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Operating Temperature Range (°C) | 0 to 70 |
| Maximum Switching Frequency | Up to 500kHz |
| Undervoltage Lockout (UVLO) | 8.4V/7.6V with hysteresis |
| Maximum Duty Cycle | 50% |
| Start-up Current | < 1mA |
| Output Current Capability | 200mA |
| Supply Voltage Range | 12V to 25V |
| RoHS Compliance | Yes |
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 UC3845D8TR is suitable for a variety of power supply applications, including:
- Off-line power supplies
- DC-to-DC converters
- Switch-mode power supplies
- High-frequency switching applications
Q & A
- What is the maximum switching frequency of the UC3845D8TR?
The UC3845D8TR can operate up to 500kHz.
- What is the operating temperature range of the UC3845D8TR?
The operating temperature range is from 0°C to 70°C.
- What is the undervoltage lockout (UVLO) threshold for the UC3845D8TR?
The UVLO thresholds are 8.4V and 7.6V with hysteresis.
- What is the maximum duty cycle of the UC3845D8TR?
The maximum duty cycle is 50%.
- What is the start-up current of the UC3845D8TR?
The start-up current is less than 1mA.
- What is the output current capability of the UC3845D8TR?
The output current capability is 200mA.
- Is the UC3845D8TR RoHS compliant?
Yes, the UC3845D8TR is RoHS compliant.
- What type of package does the UC3845D8TR come in?
The UC3845D8TR comes in an 8-pin SOIC package.
- What are some common applications for the UC3845D8TR?
Common applications include off-line power supplies, DC-to-DC converters, and high-frequency switching applications.
- Does the UC3845D8TR have automatic feedforward compensation?
Yes, the UC3845D8TR has automatic feedforward compensation.
