Overview of UC1524A, UC2524A, and UC3524A
The UC1524A, UC2524A, and UC3524A range of integrated circuits are advanced regulating pulse width modulators (PWM ICs) developed by Texas Instruments. These devices are designed to improve upon and be fully interchangeable with the industry-standard UC1524 family, offering enhancements without compromising performance or compatibility in most existing applications.
Key Features and Enhancements
High Accuracy and Versatility: The UC1524A series boasts a highly precise 5V reference, trimmed to +1% accuracy, simplifying designs by eliminating the need for potentiometer adjustments. It features a versatile error amplifier with a wide input range, current sense amplifier, and uncommitted transistor switches rated at 60V, 200mA, enhancing output flexibility.
Protection and Control: The series includes under-voltage lockout with hysteretic turn-on, ensuring low standby current and straightforward design for Iow power, off-line supplies. The PWM latch ensures a single pulse per period, avoiding multiple pulsing even in noisy environments. Automatic thermal protection safeguards against excessive chip temperature.
Improved Usability: The oscillator circuit can be used beyond 500kHz and easily synchronized with an external clock. Elimination of double pulsing, a 200ns external shutdown capability, and thermal shutdown protection are among the thoughtful design enhancements included.
Wide Operating Temperature Range: These ICs are designed for various temperature demands, with the UC1524A rated from -55°C to +125°C, the UC2524A from -40°C to +85°C, and the UC3524A from 0°C to +70°C. Options for ceramic or plastic packages, as well as surface mount devices, cater to diverse application requirements.
Absolute Maximum Ratings and Electrical Characteristics
Risk Mitigation: The maximum supply voltages are 40V for input and 60V for collectors, with output current capped at 200mA for each output. These ratings ensure device stability and longevity even under stress. For thermal limitations, specifics are detailed in the packaging section of the Databook.
Performance Stability: Electrical characteristics include a turn-on threshold, operating currents, and hysteresis to keep the devices predictable and reliable over their specified temperature ranges. High-standard specifications for reference section output voltage, line and load regulation, temperature stability, short-circuit current, output noise voltage, and long-term stability highlight the robust nature of this series.
Package and Connection
Access to the functionalities of these advanced PWM ICs is facilitated by standard DIL-16, SOIC-16, PLCC-20, and LCC-20 connection diagrams, ensuring straightforward implementation within a broad range of applications.
References:
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