Overview
The onsemi UC2844BDR2G is a high-performance current mode PWM controller designed for off-line and dc-dc converter applications. This integrated circuit is part of the UC2844B series and is known for its cost-effective solution with minimal external components. It features an oscillator, a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high current totem pole output, making it ideal for driving power MOSFETs. The device is available in a 14-pin SOIC package, which includes separate power and ground pins for the totem pole output stage.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Current - Max | 17 mA |
| Supply Voltage | 10 V to 36 V |
| Turn On Threshold Voltage | 16 V |
| Turn Off Threshold Voltage | 10 V |
| Duty Cycle - Max | 48% |
| Frequency - Max | 275 kHz |
| Operating Temperature Range | -25°C to +85°C |
| Package Style | SOIC-14 |
| Mounting Method | Surface Mount |
Key Features
- Trimmed Oscillator for Precise Frequency Control
- Oscillator Frequency Guaranteed at 250 kHz
- Current Mode Operation to 500 kHz Output Switching Frequency
- Output Deadtime Adjustable from 50% to 70%
- Automatic Feed Forward Compensation
- Latching PWM for Cycle-By-Cycle Current Limiting
- Internally Trimmed Reference with Undervoltage Lockout
- High Current Totem Pole Output
- Undervoltage Lockout with Hysteresis
- Low Startup and Operating Current
- Pb-Free Packages are Available
Applications
The UC2844BDR2G is specifically designed for off-line and dc-dc converter applications. It is suitable for various power management scenarios, including:
- Off-Line Converters
- DC-DC Converters
- Flyback Regulators
- Step-Up Charge Pump Converters
- Voltage-Inverting Charge Pump Converters
Q & A
- What is the UC2844BDR2G used for?
The UC2844BDR2G is used for off-line and dc-dc converter applications, providing a cost-effective solution with minimal external components.
- What is the maximum supply voltage for the UC2844BDR2G?
The maximum supply voltage for the UC2844BDR2G is 36 V.
- What is the maximum operating frequency of the UC2844BDR2G?
The maximum operating frequency of the UC2844BDR2G is 275 kHz.
- What type of package does the UC2844BDR2G come in?
The UC2844BDR2G comes in a 14-pin SOIC package.
- What are the key features of the UC2844BDR2G?
The key features include a trimmed oscillator, current mode operation, adjustable output deadtime, and undervoltage lockout with hysteresis, among others.
- What is the operating temperature range of the UC2844BDR2G?
The operating temperature range of the UC2844BDR2G is -25°C to +85°C.
- Does the UC2844BDR2G have protective features?
Yes, the UC2844BDR2G includes protective features such as input and reference undervoltage lockouts, cycle-by-cycle current limiting, and a latch for single pulse metering.
- Is the UC2844BDR2G Pb-free?
Yes, the UC2844BDR2G is available in Pb-free packages.
- What are some typical applications of the UC2844BDR2G?
Typical applications include off-line converters, dc-dc converters, flyback regulators, step-up charge pump converters, and voltage-inverting charge pump converters.
- How does the UC2844BDR2G handle output deadtime?
The UC2844BDR2G allows output deadtime to be programmed from 50% to 70%.
