L5993 CONSTANT POWER CONTROLLER

Category: Electronics, Other Semiconductors, STMicroelectronics Inc

L5993 CONSTANT POWER CONTROLLER Overview

The L5993 CONSTANT POWER CONTROLLER, as described in its datasheet, is a device specifically manufactured to serve as a primary controller for applications such as constant power line or DC-DC power supply systems. This primary controller integrates current-mode control PWM with the capability of operating at switching frequencies up to 1MHz.

Key features highlighted in the datasheet for the L5993 include:

Low Start-Up Current: This characteristic pertains to the low power consumption when the controller is first enabled, with a value of less than 120uA.
Constant Output Power: The device’s output power remains consistent across varying switching frequencies, ensuring reliable performance no matter the operation conditions.
High-Current Output Drive: The device is capable of driving power MOSFETs with output currents of up to 1A, suitable for high-power applications.
Fully Latched PWM Logic: The inclusion of double pulse suppression within the device’s PWM logic ensures that potential errors in pulse timing are minimized.
Programmable Duty Cycle: Users can program the duty cycle of the L5993, offering a range up to 100% or reduced to 50% maximum duty cycle limit if needed.
Comprehensive Protection Features: These include overcurrent fault detection with restart delay, PWM under-voltage lockout (UVLO) with hysteresis, IN/OUT synchronization, and latched disable for safety and control.
Advanced Timing and Sensing: An internal leading edge blanking of 100ns for current sense is present alongside soft start features, enhancing the response to dynamic conditions.

The product is based on the advanced BCD technology and comes in two package types: DIP16 and SO16N. Ordering numbers differ based on the packaging with the DIP16 package being L5993 and the SO16 version being L5993D.

Power Management and Safety

L5993 is also engineered with various power management and safety features, such as a programmable soft start, IN/OUT synchronization for aligning with different components in the system, and disable functions that cater to situations such as overvoltage protection. The datasheet also mentions precise maximum duty cycle control, which is significant when dealing with energy efficiency and power regulation.

Applications

The controller’s “constant power” feature is significant for controlling throughput power in devices such as multi-sync monitor switch-mode power supplies (SMPS), which require precise power delivery for optimal performance.

Circuit Integration

The block diagram provided indicates the comprehensive integration approach of the controller, showcasing connections like VREF OK, PWM UVLO, and overcurrent detection circuitry, among others. This highlights the L5993’s role as a central orchestrator in power supply applications.

Overall, the datasheet suggests that the L5993 CONSTANT POWER CONTROLLER is a highly versatile and capable component, suited for power supply applications that require robust control, integrative features, and adheres to BCD technology standards.