Allicdata Part #: | UC3844BDOS-ND |
Manufacturer Part#: |
UC3844BD |
Price: | $ 0.00 |
Product Category: | Integrated Circuits (ICs) |
Manufacturer: | ON Semiconductor |
Short Description: | IC REG CTRLR PWM CM 14-SOIC |
More Detail: | Boost, Flyback Regulator Positive Output Step-Up, ... |
DataSheet: | UC3844BD Datasheet/PDF |
Quantity: | 1000 |
Series: | -- |
Packaging: | Tube |
Part Status: | Obsolete |
Output Type: | Transistor Driver |
Function: | Step-Up, Step-Up/Step-Down |
Output Configuration: | Positive |
Topology: | Boost, Flyback |
Number of Outputs: | 1 |
Output Phases: | 1 |
Voltage - Supply (Vcc/Vdd): | 10 V ~ 36 V |
Frequency - Switching: | Up to 500kHz |
Duty Cycle (Max): | 48% |
Synchronous Rectifier: | No |
Clock Sync: | No |
Serial Interfaces: | -- |
Control Features: | Frequency Control |
Operating Temperature: | 0°C ~ 70°C (TA) |
Package / Case: | 14-SOIC (0.154", 3.90mm Width) |
Supplier Device Package: | 14-SOIC |
Base Part Number: | UC384*B |
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UC3844BD Application Field and Working Principle
UC3844BD is a high performance current mode controller, part of the UC38xx series of products. This device is a Pulse Width Modulator (PWM), meaning it produces a rectangular pulse signal of variable duty cycle. The UC3844BD is designed for use in Uninterruptible Power Supply systems, Switching AC/DC converters, and SMPS. The device has excellent line and load regulations and a wide input range. The UC3844BD also offers high power efficiency, high power delivery, and simple construction. The device is extremely robust and stable, and its ability to operate over a wide temperature range enables it to be used for a variety of applications.
Features and Benefits
- High switching frequency of up to 500kHz
- Very fast current loop response
- Compact package SO-8
- Undervoltage lockout
- Wide temperature range
- High power delivery
- Simple construction
- Low standby power consumption
- Excellent line and load regulation
Applications
- Primary side and secondary side of offline AC/DC converters
- Battery chargers
- LED drivers
- Uninterruptible Power Supply (UPS) systems
- SMPS applications
Working Principle
The UC3844BD is a pulse width modulator working in the current mode. It is designed to work as a voltage regulator for various DC/DC conversion applications. The device produces a rectangular pulse signal of variable duty cycle. The pulse width is adjusted by the current through the control pin, where a higher current results in a higher pulse width. The pulse width is then used to control the power to the switching device, thus regulating the output voltage. The UC3844BD can be used as a single ended control voltage regulator and is capable of driving either MOSFETs or BJT switches. The device provides a hold-up time of 50ms at start-up, enough for any DC/DC converter.
Conclusion
The UC3844BD is a reliable and efficient pulse width modulator used for various DC/DC conversion applications. The device is designed to provide high power efficiency, high power delivery, and excellent line and load regulation. The device offers a wide temperature range and offers a simple construction. It is suitable for use in primary side and secondary side of offline AC/DC converters, battery chargers, LED drivers, Uninterruptible Power Supply (UPS) systems, and SMPS applications.
The specific data is subject to PDF, and the above content is for reference
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