Overview
The UC2845AD8 is a current-mode PWM controller produced by Texas Instruments. It is part of the UCx84xA family, which is a pin-for-pin compatible improved version of the UCx84x family. This controller is designed to control current-mode or switched-mode power supplies, offering several enhanced features over its predecessors.
The UC2845AD8 is optimized for off-line and DC-DC converters, making it a versatile component for various power supply applications. It operates within a wide temperature range and is packaged in an 8-pin SOIC (D) package, ensuring compact and efficient design integration.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Number of Outputs | 1 |
| Output Phases | 1 |
| Voltage - Supply (Vcc/Vdd) | 7.6 V ~ 30 V |
| Frequency - Switching | 500 kHz |
| Duty Cycle (Max) | 48% |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Topology | Boost, Flyback, Forward Converter |
| Output Type | Transistor Driver |
| UVLO (Undervoltage Lockout) | 8.4V/7.6V with Hysteresis |
Key Features
- Optimized for Off-Line and DC-DC Converters
- Low Start-Up Current (< 0.5mA)
- Trimmed Oscillator Discharge Current
- 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
- Create a Custom Design Using the UCx84xA With the WEBENCH Power Designer
Applications
The UC2845AD8 is suitable for a variety of power supply applications, including:
- Off-Line Power Supplies
- DC-DC Converters
- Boost, Flyback, and Forward Converters
- Step-Up and Step-Up/Step-Down Converters
- Isolation Capable Output Configurations
Q & A
- What is the operating voltage range of the UC2845AD8?
The UC2845AD8 operates within a supply voltage range of 7.6 V to 30 V.
- What is the maximum switching frequency of the UC2845AD8?
The maximum switching frequency is up to 500 kHz.
- What is the package type and pin count of the UC2845AD8?
The UC2845AD8 is packaged in an 8-pin SOIC (D) package.
- What are the key features of the UC2845AD8?
Key features include low start-up current, trimmed oscillator discharge current, automatic feedforward compensation, and high-current totem pole output among others.
- What are the typical applications of the UC2845AD8?
Typical applications include off-line power supplies, DC-DC converters, boost, flyback, and forward converters.
- What is the operating temperature range of the UC2845AD8?
The operating temperature range is from -40°C to 85°C.
- Does the UC2845AD8 support synchronous rectification?
No, the UC2845AD8 does not support synchronous rectification.
- What is the maximum duty cycle of the UC2845AD8?
The maximum duty cycle is 48%.
- Does the UC2845AD8 have undervoltage lockout (UVLO) protection?
- Can the UC2845AD8 be used for custom designs with WEBENCH Power Designer?
