The UC1856, UC2856, and UC3856 series presented in this datasheet are high-performance current mode pulse width modulation (PWM) controllers from Texas Instruments. Designed to be pin-for-pin compatible with the UC3846 series, these devices are tailored for speed and accuracy in applications both as design upgrades and new systems.
Key features highlighted in the datasheet include:
- Performance Enhancements: Reduced input to output delays and a fast 1.5A peak output stage, enabling swift switching of power FETs.
- Improved Current Sense Amplifier: Design modifications have lowered noise sensitivity, and slew-rate limiting on the current sense output decreases noise disturbance.
- Differential Current Sense: Capable of handling a 3V common mode range, to enhance system reliability and precision.
- Oscillator Control: Trimmed oscillator discharge current for precise deadband control, accompanied by TTL compatible thresholds.
- Protection: Incorporation of a shutdown feature with an accurate 1V threshold and a minimum of 4kV ESD protection on all pins.
The UC3856 variant is touted for its exceptional performance compared to its predecessors, optimizing internal grounding to mitigate noise generated when driving capacitive loads. Furthermore, the datasheet outlines the absolute maximum ratings stressing the importance of staying within these limits to avoid device failure. Notable ratings include a supply voltage of +40V, an output current of up to 2.0A in pulse mode, and a storage temperature range of -65°C to +150°C.
The datasheet also portrays connection diagrams for three types of packages—DIL-16, SOIC-16, and PLCC (in both 20 and 28-pin configurations)—providing visual assistance to engineers for proper integration of the controllers into their design projects.
In the electrical characteristics section, Texas Instruments provides detailed specifications under different conditions. The reference section, for instance, lists the output voltage, load and line regulation, and output noise voltage, assuring consistency and accuracy across a diverse range of operational scenarios.
Intended for a broad spectrum of uses, this versatile range of improved PWM controllers embodies enhancements that promise more efficient, robust, and precise control in power management applications. Engineers concerned with advancing their power designs will find the UC1856, UC2856, and UC3856 series suitable candidates for their next-generation projects.
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