UCC28740DR
Overview
Category: Integrated Circuit (IC)
Use: Power Management IC
Characteristics: - High efficiency - Low standby power consumption - Wide input voltage range - Integrated protection features
Package: SOIC-8
Essence: The UCC28740DR is a power management IC designed for efficient energy conversion in various applications.
Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.
Specifications
- Input Voltage Range: 4.5V to 30V
- Output Voltage Range: 3.3V to 24V
- Maximum Output Current: 1A
- Switching Frequency: 100kHz to 1MHz
- Standby Power Consumption: <10mW
- Operating Temperature Range: -40°C to 125°C
Pin Configuration
The UCC28740DR has the following pin configuration:
- VDD: Power supply input
- GND: Ground reference
- FB: Feedback pin for output voltage regulation
- COMP: Compensation pin for loop stability
- CS: Current sense input
- EN/UVLO: Enable/Undervoltage lockout control
- DRAIN: Switching node connection
- VDDP: Power supply input for internal circuitry
Functional Features
- Primary-side regulation for improved efficiency
- Constant voltage or constant current output modes
- Frequency jittering for reduced EMI emissions
- Cycle-by-cycle peak current limit
- Overvoltage and overcurrent protection
- Soft-start and shutdown functions
Advantages and Disadvantages
Advantages: - High efficiency leads to energy savings - Wide input voltage range allows for versatile applications - Integrated protection features enhance system reliability - Compact SOIC-8 package for space-constrained designs
Disadvantages: - Limited maximum output current of 1A - Requires external components for complete power supply design
Working Principles
The UCC28740DR operates on the principle of primary-side regulation, where the feedback signal is derived from the primary side of the power conversion circuit. This eliminates the need for an optocoupler or secondary-side feedback circuitry, reducing component count and cost. The IC uses a flyback topology to convert the input voltage to the desired output voltage with high efficiency.
Detailed Application Field Plans
The UCC28740DR is suitable for a wide range of applications, including but not limited to: - AC/DC power supplies - LED lighting systems - Battery chargers - Industrial control systems - Home appliances
Detailed and Complete Alternative Models
Some alternative models that can be considered as alternatives to the UCC28740DR are: - UCC28741DR - UCC28742DR - UCC28743DR - UCC28744DR
These models offer similar functionality and characteristics, providing flexibility in choosing the most suitable option for specific application requirements.
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Luettele 10 yleistä kysymystä ja vastausta, jotka liittyvät UCC28740DR :n soveltamiseen teknisissä ratkaisuissa
Sure! Here are 10 common questions and answers related to the application of UCC28740DR in technical solutions:
Q: What is UCC28740DR? A: UCC28740DR is a highly integrated primary-side regulated (PSR) flyback controller used in offline AC/DC power supplies.
Q: What are the key features of UCC28740DR? A: The key features of UCC28740DR include primary-side regulation, high efficiency, low standby power consumption, and comprehensive protection features.
Q: How does UCC28740DR achieve primary-side regulation? A: UCC28740DR uses a proprietary constant on-time (COT) control scheme that eliminates the need for an optocoupler or secondary-side feedback circuitry.
Q: What is the advantage of primary-side regulation? A: Primary-side regulation simplifies the design, reduces component count, improves reliability, and lowers cost compared to traditional secondary-side regulation.
Q: What is the maximum output power supported by UCC28740DR? A: UCC28740DR supports output power up to 25W, making it suitable for a wide range of applications such as adapters, chargers, and auxiliary power supplies.
Q: Can UCC28740DR operate in continuous conduction mode (CCM) and discontinuous conduction mode (DCM)? A: Yes, UCC28740DR can operate in both CCM and DCM, providing flexibility in different load conditions.
Q: Does UCC28740DR have built-in protection features? A: Yes, UCC28740DR includes comprehensive protection features like overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown.
Q: What is the standby power consumption of UCC28740DR? A: UCC28740DR has an ultra-low standby power consumption of less than 30mW, enabling compliance with energy efficiency standards.
Q: Can UCC28740DR support wide input voltage range? A: Yes, UCC28740DR supports a wide input voltage range from 85VAC to 265VAC, making it suitable for global applications.
Q: Are there any reference designs available for UCC28740DR? A: Yes, Texas Instruments provides various reference designs and application notes that can help engineers in implementing UCC28740DR in their technical solutions.
Please note that these answers are general and may vary depending on specific design requirements and application scenarios.