AS3691B-ZMFT

Voltage - Output:	15V
Supplier Device Package:	64-QFN (9x9)
Package / Case:	64-VFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-20°C ~ 85°C (TA)
Applications:	Backlight, Lighting
Dimming:	--
Frequency:	--
Current - Output / Channel:	400mA
Series:	--
Voltage - Supply (Max):	--
Voltage - Supply (Min):	--
Number of Outputs:	4
Internal Switch(s):	Yes
Topology:	--
Type:	Linear
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

AS3691B-ZMFT is a component type Power Management Integrated Circuit (PMIC), specifically designed for LED Drivers. It is used to provide an efficient way of managing the output current in order to deliver the required amount of current to its associated LEDs. The component obtains the necessary information from a wide range of micro-controller platforms. The component can be used to deliver a variety of output current values, ranging from 0.1 A to a maximum of 4 A, depending on the application.

Application Field

The application field of AS3691B-ZMFT is primarily in LED Drivers, but it could also be used in other applications such as automotive, industrial, and home applications. It can be used to provide uniform lighting outputs in lighting installations, especially in street lamps and other projectors. The DC output current could also be used to drive audio equipment, or powering set-top boxes, DVD players and other communication related equipment.

Working Principle

AS3691B-ZMFT works by monitoring the output voltage of the micro-controller and controlling the output current based on the voltage levels. When the voltage readings from the microcontroller reach a certain predetermined level, the component will then send a signal to the output current regulator to increase or decrease the current, as necessary. This particular PMIC makes use of a Linear Voltage Regulator (LVR) to adjust the output current. The AS3691B-ZMFT has two basic operating modes, which are: DC Output and Pulse-Width Modulation (PWM). In DC output mode, the PMIC operates in an ‘open-loop’ fashion and the output current can be regulated in four different ranges. The operating frequency of the PMIC is fixed at 1KHz when operating in DC mode. On the other hand, PWM mode enables the PMIC to provide an output which can be modulated in order to provide the necessary control over the brightness of the LEDs. In order to provide the necessary flexibility, AS3691B-ZMFT also comes with several features, such as minimum current limiting, input under-voltage, output over-voltage, current sensing and temperature protection. These features ensure that the component is able to respond to all the changes in the input voltage and current levels and adjust its output accordingly. Furthermore, AS3691B-ZMFT also offers a soft-start and stop feature in order to reduce any potential surges during the operation.

Conclusion

In conclusion, AS3691B-ZMFT is an ideal choice for powering LEDs and other digital communication related equipment. As it comes with all the necessary features, it is considered to be a reliable and efficient choice. Moreover, the versatility of the component makes it suitable for various applications, ranging from automotive and industrial applications to home lighting installations.

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