ISL6551IBZ

Frequency - Switching:	50kHz ~ 500kHz
Base Part Number:	ISL6551
Supplier Device Package:	28-SOIC
Package / Case:	28-SOIC (0.295", 7.50mm Width)
Operating Temperature:	0°C ~ 85°C (TA)
Control Features:	Current Limit, Dead Time Control, Enable, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	50%
Series:	--
Voltage - Supply (Vcc/Vdd):	10.8 V ~ 13.2 V
Output Phases:	1
Number of Outputs:	1
Topology:	Full-Bridge
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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Introduction of ISL6551IBZ

ISL6551IBZ is a highly integrated, high efficiency, monolithic switching regulator controllers dedicated to robust, synchronous rectified, DC/DC power converter design. ISL6551IBZ combines an adjustable precision current-mode control scheme with an incorporation of advanced control and protection techniques in order to boost the performance of the output power supply, enabling designers to use the latest in high-frequency power transformer design for maximum efficiency and reliability. ISL6551IBZ incorporates Synchronous Rectification (SR) optimized controllers and drivers, Low Drop-Out (LDO) Linear Regulators, Adjustable Over-Current Protection (OCP) as well as Internal Soft-Start and Self-Diagnostics features, making it suitable for a wide range of applications from portable and battery-powered equipment to high-end, telecommunications applications.

Application Field of ISL6551IBZ

ISL6551IBZ is mainly used in portable devices with its adjustable precision current-mode control scheme. Its applications field is plenty and vary, such as PDAs, Cellular phones, Smart phones, MP3 players, Camcorders, Digital multi-function printers, Wi-Fi access points, LCD monitor, Notebook PC, Digital TV and other consumer electronics products. ISL6551IBZ also can be used in Wide input voltage range of 12 V to 24 V and output voltage from 0.7 V to 15 V. It can provide solutions for notebook computers, server power, desktop PCs, and a wide range of ITE and consumer/computing applications.

Working Principle of ISL6551IBZ

The ISL6551IBZ works on a synchronous rectification topology. Basically, the circuit forms a synchronous rectification control with a loop-controlled current-mode peak current control. The output voltage and the current are set by the operating conditions of the loop and the power constant of the power converter. The voltage feedback loop is provided by the internal voltage regulator. The output voltage is regulated using a voltage reference, and the power supply is monitored continuously by the current sense amplifier, providing the complete control loop for the supply.The internal voltage reference also provides for a Soft Start/Rise Time feature. During the Rise Time a fixed charge current is provided to the output capacitance to ensure a smooth and soft start until the normal control loop takes over. Under Voltage Lock Out protection is also provided by an internal circuit that disables the switch-mode operation under an adjustable pre-defined voltage independent of the voltage reference.All data and control pins are connected to a two-wire digital bus, which simplifies PCB routing and reduces the number of external components. In addition, the part also features built-in protection functions such as cycle-by-cycle current limit and adjustable over current protection. These protection functions keeps the power supply safe, ensuring reliable operation and system stability with reduced risk of shutdown due to over current or over temperature condition.

Conclusion

In summary, ISL6551IBZ is a high-performance monolithic switching regulator controllers with synchronous rectification technique that is suitable for a wide range of applications. It combines precision current-mode control with advanced control and protection techniques to enhance system performance and reliability. Its small size and high integration capabilities enables designers to use the latest in high-frequency power transformer designs for maximum efficiency and reliability. ISL6551IBZ is a perfect choice for almost any portable device from PDAs, smart phones, digital TVs, and other consumer electronics.

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