UC2825A-Q1 - 汽车类高速 PWM 控制器

UC2825A-Q1是TI德州仪器公司的一款PWM与谐振控制器产品，UC2825A-Q1是汽车类高速 PWM 控制器，本站介绍了UC2825A-Q1的封装应用图解、特点和优点、功能等，并给出了与UC2825A-Q1相关的TI元器件型号供参考。

UC2825A-Q1 - 汽车类高速 PWM 控制器 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

The UC2825A pulse-width modulation (PWM) controller is an improved versions of the standard UC3825. Performance enhancements have been made to several of the circuit blocks. Error amplifier gain bandwidth product is 12 MHz, while input offset voltage is 2 mV. Current limit threshold is specified to a tolerance of 5%. Oscillator discharge current is specified at 10 mA for accurate dead-time control. Frequency accuracy is improved to 6%. Startup supply current, typically 100 µA, is ideal for off-line applications. The output drivers are redesigned to actively sink current during undervoltage lockout (UVLO) at no expense to the startup current specification. In addition, each output is capable of 2-A peak currents during transitions.

Functional improvements have also been implemented. The shutdown comparator is now a high-speed overcurrent comparator with a threshold of 1.2 V. The overcurrent comparator sets a latch that ensures full discharge of the soft-start capacitor before allowing a restart. While the fault latch is set, the outputs are in the low state. In the event of continuous faults, the soft-start capacitor is fully charged before discharge to insure that the fault frequency does not exceed the designed soft start period. The CLOCK pin has become CLK/LEB. This pin combines the functions of clock output and leading edge blanking adjustment and has been buffered for easier interfacing.

The UC2825A has dual alternating outputs and the same pin configuration of the UC3825. "A" version parts have UVLO thresholds identical to the original UC3825.

See the application report, The UC3823A,B and UC3825A,B Enhanced Generation of PWM Controllers (SLUA125) for detailed technical and application information.

产品特性

Qualified for Automotive Applications
Improved Version of the UC3825 PWM
Compatible With Voltage-Mode or Current-Mode Control Methods
Practical Operation at Switching Frequencies to 1 MHz
50-ns Propagation Delay to Output
High-Current Dual Totem-Pole Outputs: 2 A (Peak)
Trimmed Oscillator Discharge Current
Low 100-µA Startup Current
Pulse-by-Pulse Current-Limiting Comparator
Latched Overcurrent Comparator With Full-Cycle Restart

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