Overview
The Texas Instruments UC1714, UC1715, UC2714, UC2715, UC3714, and UC3715 complementary switch FET drivers are specialized high-speed drivers tailored to provide robust drive waveforms for synchronous rectification circuits and active clamp/reset configurations. These devices, which feature single input compatibility with PWM and TTL, are essential for zero voltage switching applications that necessitate smooth and efficient transitions.
Key Features
These drivers boast a 1-A source and 2-A sink for the high-current power FET driver and an auxiliary output FET driver with 0.5-A source and 1-A sink capabilities. Programmable delays ranging from 50ns to 500ns can be set independently for both power and auxiliary outputs, allowing precise timing control for optimal performance. The drivers offer true-zero voltage operation or time delays with independently configurable settings for each output. Additionally, a unique enable (ENBL) pin puts the device into a low-power sleep mode to conserve energy when not in active use.
Technical Specifications
With a switching frequency capability up to 1 MHz and typical 50-ns propagation delays, these drivers are suitable for high-frequency applications. The UC1714 series features an inverted AUX output for driving P-channel MOSFETs, while the UC1715 series presents true complementary output configurations. The devices can efficiently operate from a 5V supply voltage, with absolute maximum ratings provided to ensure safe and reliable operation under various conditions.
The ENBL pin activates a 220-µA sleep mode to minimize power consumption when the driver is not actively driving a load, and the power output remains active-low during this mode. With the need for an external PWM-type input, these drivers seamlessly interface with common PWM controllers.
Block Diagram and Pin Configuration
Located within the datasheet, the block diagram illustrates the internal configuration, including the power (PWR) and auxiliary (AUX) timers, VCC 5V bias supply, and logic gates. Also provided are the ENBL, VREF, and ground reference points. The pin numbers correspond to the J, N, and D packages, as noted within the datasheet.
Absolute Maximum Ratings and Electrical Characteristics
The datasheet details absolute maximum ratings to prevent device damage under extreme conditions, with a strong emphasis on understanding that surpassing these limits—even momentarily—may affect device reliability. Also outlined are the electrical characteristics that define the operating conditions for different UC series devices. Parameters such as supply voltage, lead temperature, input voltage range, and operating junction temperature provide insights into the device’s capabilities and constraints.
For the precise operation and integration of these FET drivers, the datasheet references the Packaging Section, ensuring that users adhere to the thermal limitations and packaging specifications.
References:
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