LT3485EDD-2#PBF

Series:	--
Packaging:	Tube
Part Status:	Active
Applications:	Photoflash Capacitor Charger, Xenon
Current - Supply:	5mA
Voltage - Supply:	1.7 V ~ 10 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	10-WFDFN Exposed Pad
Supplier Device Package:	10-DFN (3x3)
Base Part Number:	LT3485

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LT3485EDD-2#PBF Application Field and Working Principle

LT3485EDD-2#PBF is a current-mode PWM buck controller which can provide high efficiency and is suitable for a wide range of applications from desktop adapters to automotive onboard chargers and beyond. This paper will discuss the application field and working principle of LT3485EDD-2#PBF.

Application Field

LT3485EDD-2#PBF is widely used in desktop, laptop, cellular phone and other power adapters and chargers. It provides adequate DC current to charge the battery and power the device. The low quiescent current, wide input range and adjustable switching frequency make it ideal to create extremely efficient and high power density power solutions. LT3485EDD-2#PBF can also be used in automotive onboard charging systems. Automotive onboard chargers play a key role in vehicles with low voltage batteries, providing continuous power when the engine is off. A highly efficient onboard charger with a multiport capability can charge multiple batteries in parallel, making this a very attractive solution for automotive applications. LT3485EDD-2#PBF can also be used in fast charger applications. It can provide fast charging up to the system design rating and support high power applications with high efficiency due to its high current capability and adjustable switching frequency.

Working Principle

LT3485EDD-2#PBF uses a current-mode PWM control scheme for precise control of the output current. This control scheme includes an internal sensing circuit that continuously monitors the output current. The current-mode control adjusts the duty cycle of the PWM output based on the input voltage, output voltage and output current. At the same time, the output voltage of the LT3485EDD-2#PBF is regulated by the current-mode control scheme. The regulation is based on the output voltage feedback which is routed through the error amplifier inside the IC. The error amplifier adjusts the PWM duty cycle according to the detected deviation between the actual and desired output voltage. The PWM duty cycle is constantly adjusted by monitoring the voltage and current feedback. The LT3485EDD-2#PBF also features internal slew rate limiting and adjustable switching frequency which ensures stability under all load conditions. Slew rate limiting improves the dynamic response of the system, reducing the feedback voltage errors. This helps achieve an efficient power supply solution without compromising noise performance or dynamic responses. The adjustable switching frequency allows designers to choose the optimal frequency that best suits the needs of their application.

Conclusion

In conclusion, LT3485EDD-2#PBF is a current-mode PWM buck controller which can provide high efficiency and is suitable for a wide range of applications from desktop adapters to automotive onboard chargers and beyond. The high current capability and adjustable switching frequency make it an ideal solution for automotive onboard chargers, fast charger applications and other power solutions. The current-mode control, adjustable switching frequency and slew rate limiting ensure a stable and efficient power supply solution.

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