ISL6565ACRZ

Frequency - Switching:	80kHz ~ 1.5MHz
Base Part Number:	ISL6565A
Supplier Device Package:	28-QFN (5x5)
Package / Case:	28-VFQFN Exposed Pad
Operating Temperature:	0°C ~ 105°C (TA)
Control Features:	Enable, Frequency Control, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	--
Duty Cycle (Max):	66.7%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.75 V ~ 5.25 V
Output Phases:	3
Number of Outputs:	3
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	PWM Signal
Part Status:	Obsolete
Packaging:	Tube

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ISL6565ACRZ is an advanced, integrated, high frequency, step-down, synchronous, rad-hard, Pulse-Width Modulation Controller (PWM) for space applications.

The ISL6565ACRZ is used as a controller in DC-DC step-down power supplies and regulators. It offers superior performance, with high levels of integration, making it ideal for space and industrial applications. This monolithic PWM-controller provides improved accuracy, fast transient response, small footprint, and significantly reduced external component count.

Applications of the ISL6565ACRZ

The ISL6565ACRZ can be used in a variety of applications:

• Space applications including satellites, spacecraft, and high-altitude aircraft.
• Chargers/battery applications.
• Intelligent power supplies and line converters.
• High-efficiency, DC-DC, synchronous buck converters.
• Regulated and synchronous buck (pos/neg) switching converters.
• Industrial, medical, and automotive applications.

The ISL6565ACRZ offers a wide range of features such as high efficiency due to synchronous buck operation, programmable surface-mountable integrated RDSON paired MOSFETs, an adjustable voltage soft-start, and a power good/OV/UV monitoring.

ISL6565ACRZ Working Principles

The ISL6565ACRZ is a pulse-width modulation controller that uses a high-frequency timing signal to control the switching frequency. The on-time and off-time of the switching waveform are determined by the programmed values of the reference voltage and the sense resistor. The voltage feedback loop is used to regulate the output voltage by monitoring the voltage drop across the sense resistor. The ISL6565ACRZ includes a power good/UV/OV monitoring circuit which provides warning signals for the output voltage when it exceeds the specified limits. The device also features an adjustable soft-start function to control the ramp-up of the output voltage during start-up or when it is subject to a transient. In addition, the device also features an adjustable frequency lockout to protect the power solution from long duty cycle operation.

Conclusion

The ISL6565ACRZ is an advanced and high performance Pulse Width Modulation controller for space and industrial applications. It is designed for DC-DC step-down power supplies and regulators with improved accuracy, fast transient response and low external component count. It offers wide range of features like high efficiency, adjustable soft start, programmable MOSFETs and power good/OV/UV monitoring.

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