L5991A

Frequency - Switching:	Up to 1MHz
Base Part Number:	L5991A
Supplier Device Package:	16-DIP
Package / Case:	16-DIP (0.300", 7.62mm)
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	Current Limit, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	93%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 20 V
Output Phases:	1
Number of Outputs:	1
Topology:	Flyback
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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PMIC - Voltage Regulators - DC DC Switching Controllers

Introduction to L5991A

The L5991A is a small 4 pin IC, designed and manufactured by STMicroelectronics. It is designed for applications that require high current, low distortion and efficient power supply control. The device operates with a wide input voltage range of 2.95V to 9V. It is also capable of delivering up to 2A output currents in an adjustable range of 0.7V to 5.1V, making it ideal for 5V or 3V applications.

Application Field

The L5991A has several applications, including the powering of embedded systems, telecommunications and network equipments, low-cost consumer equipment, instrumentation and automotive applications. The device is suitable for buck, boost and buck-boost power regulation circuits. It is also commonly used in applications such as power supplies, DC/DC converters and high current/precision applications. The L5991A has low turn-on resistance and high switching frequency, which allows for the construction of capacitive, inductive or resistor-capacitor filter circuits to reduce EMI and conduct noise. It is also capable of operating in pulsed-mode and can be synchronized with an external clock, providing designers with greater flexibility in their applications.

Working Principle

The working principle of the L5991A IC is fairly simple. It takes an input voltage and output current from an external power source. The IC then uses an internal oscillator circuit to turn the power switch on and off, providing the output current according to the desired output voltage.At its simplest, the L5991A can be used to build a basic buck converter circuit. This circuit works by reducing voltage and current by continuously switching the power switch on and off. The frequency of the switch and the duty cycle control the output voltage.More complex circuits with more advanced functions such as synchronizing the clock can be built around the L5991A. In addition, power correction loops can be used to enhance power efficiency, reduce output ripple and provide precise output voltage regulation.

Conclusion

The L5991A is a versatile, cost-effective 4-pin IC, suitable for a wide range of applications. From embedded systems to power supplies and DC/DC converters, the L5991A can be used to regulate and control high current, low distortion and efficient power supply. With its low turn-on resistance and high switching frequency, the L5991A is an ideal choice for a wide range of applications.

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