AS3648B-ZWLT

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AS3648B-ZWLT is a member of PMIC – LED Drivers family developed by Allegro Microsystems Inc. It is a three channel constant current regulation LED driver chip that helps to drive LEDs with a low voltage input. The device draws only 1.2uA (typical) of supply current and allows the user to program channel currents using two external resistors, thereby eliminating current-balancing issues.

The device also offers fault protection features and can be configured to operate in either open drain mode, or as a push-pull driver. The chip is ideal for applications where LEDs may require high current or fast current response. It can be used in various applications including industrial, automotive and telecommunications.

One of the main features of the AS3648B-ZWLT is its ability to operate with a wide range of input voltages from 4.5V to 18V. This provides an ideal solution for many power supply designs. The device offers adjustable peak current limiting and short-circuit protection and is capable of reaching a maximum peak output current of 50mA. The adjustable shut-down current of 2mA to 10mA helps to ensure no additional current is drawn when the device is disabled.

The product’s working principle is based on Pulse Width Modulation (PWM). This type of regulation means the output current adjusts automatically based on the input voltage and the resistors used to set the desired currents. Even if the voltage to the device drops, it can still maintain the current to the LEDs as more power is drawn from the external power supply. This ensures that the LEDs maintain steady and consistent performance, eliminating the need for voltage regulation.

Another useful feature of the AS3648B-ZWLT chip is the wide range of dimming options. It supports single-wire PWM dimming, as well as Analog dimming. This means the device can operate at reduced current and maintains a steady output level over a wide dimming range from 0 to 100%.

In addition, the AS3648B-ZWLT chip offers high level of protection from other power system failures such as overheating, excessive current, and low voltage. It also features a wide ambient temperature range (from -40°C to +105°C) that helps to ensure reliable operation in any environment. The chip is RoHS compliant and UL certified.

The AS3648B-ZWLT chip is the perfect solution for driving multiple LEDs with high current, while enabling dimming and providing high level of protection against power system failure. It is highly reliable, easy to use and provides a cost effective combination of performance, features and flexibility. This makes it an ideal choice for a variety of LED lighting applications.

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