Overview
The UC3845ADM-TR is a fixed-frequency current-mode PWM (Pulse Width Modulation) controller produced by Microchip Technology. This component is designed for off-line and DC-DC converter applications, offering a versatile solution for power management needs. The UC3845ADM-TR is part of the UC3842/UC3843/UC3844/UC3845 family, known for its reliability and performance in various power conversion topologies.
Key Specifications
| Category | Value |
|---|---|
| Manufacturer | Microchip Technology |
| Package | Tape & Reel (TR), Cut Tape (CT), Digi-Reel® |
| RoHS | RoHS Compliant |
| Function | Step-Up, Step-Down |
| Topology | Boost, Buck, Flyback, Forward |
| Output Type | Transistor Driver |
| Mounting Type | Surface Mount |
| Output Phases | 1 |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Control Features | Frequency Control |
| Duty Cycle (Max) | 48% |
| Number of Outputs | 1 |
| Frequency - Switching | Up to 500kHz |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Voltage - Supply (Vcc/Vdd) | 7.6V ~ 30V |
| Start Threshold | 7.8V ~ 9.0V |
| Min. Operating Voltage (After Turn On) | 7.0V ~ 8.2V |
Key Features
- Current-Mode PWM Control: The UC3845ADM-TR operates in current-mode, providing precise control over the output current, which is essential for stable and efficient power conversion.
- Fixed Frequency Operation: It operates at a fixed frequency, which can be set using external components, allowing for easier design and implementation.
- Multiple Topologies Support: The controller supports various power conversion topologies including boost, buck, flyback, and forward configurations, making it versatile for different applications.
- High Switching Frequency: The controller can operate up to 500kHz, enabling the use of smaller components and reducing the overall size of the power supply.
- Under-Voltage Lockout (UVLO): The UC3845ADM-TR features an under-voltage lockout to prevent the controller from operating below a specified voltage threshold, ensuring safe and reliable operation.
- Low Standby Current: The controller has a low standby current, which is beneficial for applications where power efficiency is critical.
Applications
- Off-Line Power Supplies: The UC3845ADM-TR is widely used in off-line power supplies due to its ability to handle high voltage and current requirements.
- DC-DC Converters: It is suitable for various DC-DC converter applications, including buck, boost, flyback, and forward converters.
- Industrial Power Systems: The controller is used in industrial power systems where reliability and efficiency are paramount.
- Automotive Systems: It can be found in automotive systems that require robust and efficient power management.
- Consumer Electronics: The UC3845ADM-TR is also used in consumer electronics where compact and efficient power supplies are necessary.
Q & A
- What is the UC3845ADM-TR used for?
The UC3845ADM-TR is a fixed-frequency current-mode PWM controller used for off-line and DC-DC converter applications.
- What are the supported topologies by the UC3845ADM-TR?
The controller supports boost, buck, flyback, and forward power conversion topologies.
- What is the maximum switching frequency of the UC3845ADM-TR?
The maximum switching frequency is up to 500kHz.
- What is the operating temperature range of the UC3845ADM-TR?
The operating temperature range is from 0°C to 70°C.
- What is the supply voltage range for the UC3845ADM-TR?
The supply voltage range is from 7.6V to 30V.
- Does the UC3845ADM-TR have under-voltage lockout protection?
Yes, the UC3845ADM-TR features under-voltage lockout protection to prevent operation below a specified voltage threshold.
- What is the maximum duty cycle of the UC3845ADM-TR?
The maximum duty cycle is 48%.
- Is the UC3845ADM-TR RoHS compliant?
Yes, the UC3845ADM-TR is RoHS compliant.
- What is the package type of the UC3845ADM-TR?
The package type is 8-SOIC (0.154", 3.90mm Width).
- Is the UC3845ADM-TR still in production?
No, the UC3845ADM-TR is discontinued at Digi-Key but may still be available from other suppliers or as obsolete stock.
