Overview
The UC2845AD8G4 is a current-mode PWM controller manufactured by Texas Instruments. It is part of the UCx84x series, which is designed to implement off-line or DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. This controller is optimized for use in various power supply applications, including off-line and DC-to-DC converters.
The UC2845AD8G4 features a low start-up current of less than 1mA, making it energy-efficient. It also includes an undervoltage lockout (UVLO) with hysteresis, pulse-by-pulse current limiting, and double-pulse suppression, which enhance its reliability and performance.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage Min/Max | 12V / 25V |
| Output Voltage | Up to 15V |
| Output Current | Up to 200mA |
| Frequency | Up to 500kHz |
| UVLO Thresholds | 8.4V / 7.6V |
| Maximum Duty Cycle | 50% |
| Pins | 8 |
| 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
- Up to 500kHz operation
- Error amplifier with low output resistance
Applications
The UC2845AD8G4 is suitable for a variety of power supply applications, including:
- Off-line power supplies
- DC-to-DC converters (e.g., buck, boost, flyback, forward regulators)
- Isolation capable output configurations
- Step-up, step-down, and step-up/step-down converters
Q & A
- What is the UC2845AD8G4 used for?
The UC2845AD8G4 is used for implementing off-line or DC-to-DC fixed-frequency current-mode control schemes in power supply applications.
- What is the operating temperature range of the UC2845AD8G4?
The operating temperature range is -40°C to 85°C.
- What is the maximum frequency of operation for the UC2845AD8G4?
The maximum frequency of operation is up to 500kHz.
- What is the UVLO threshold for the UC2845AD8G4?
The UVLO thresholds are 8.4V and 7.6V.
- Does the UC2845AD8G4 support high-current output?
Yes, it features a high-current totem-pole output stage.
- Is the UC2845AD8G4 RoHS compliant?
Yes, the UC2845AD8G4 is RoHS compliant.
- What is the package type of the UC2845AD8G4?
The package type is 8-SOIC (0.154", 3.90mm Width).
- What are the key features of the UC2845AD8G4?
Key features include low start-up current, automatic feedforward compensation, pulse-by-pulse current limiting, and enhanced load-response characteristics.
- Can the UC2845AD8G4 be used in DC-to-DC converters?
Yes, it is optimized for DC-to-DC converters among other applications.
- What is the maximum duty cycle of the UC2845AD8G4?
The maximum duty cycle is 50%.
