ZL2106ALCFT

Voltage - Output (Min/Fixed):	0.6V
Base Part Number:	ZL2106
Supplier Device Package:	36-QFN (6x6)
Package / Case:	36-VFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	200kHz ~ 1MHz
Current - Output:	6A
Voltage - Output (Max):	5V
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Programmable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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ZL2106ALCFT Application Field and Working Principle

Introduction

The ZL2106ALCFT is a DC/DC switching regulator from Texas Instruments that is specifically designed for high output current applications as well as adjustable voltage applications. It is built with a PWM controller, an IRF44ZN power MOSFET, and a sense resistor for output current control. The ZL2106ALCFT can output up to 4A in continuous mode and up to 10A of peak current depending on its input voltage. Additionally, the regulator has high pulse-by-pulse current limitation, fast current limit response, and precise output regulation. It also features an adjustable output voltage range of 2.5V to 6V, an efficiency up to 97%, an input voltage range of 4V to 30V, and a switching frequency of 400kHz.

Application Field

The ZL2106ALCFT DC/DC switching regulator is mainly used in board power supplies, computers, peripherals, consumer electronics, industrial control and instrumentation, automotive, process control, surveillance, and communications systems. Because of its 4A continuous mode output current capability, the ZL2106ALCFT can be used in essentially any application that requires a stable, regulated output voltage.

Principle of Operation

The ZL2106ALCFT works using an average-current mode control architecture with variable-frequency oscillator. This architecture utilizes two sensed signals, one from the sense resistor and the other from the output voltage, to detect and regulate the output voltage.When an input voltage is applied to the ZL2106ALCFT, the PWM controller activates the associated power MOSFET, allowing current to flow from the input to the output. As the current passes through the sense resistor, it is converted to a voltage, which is fed back to the PWM controller. This voltage is compared to the PWM controller\'s internal reference voltage which is a function of the VREF pin voltage.If the sensed voltage is higher than the reference voltage, the internal 200kHz oscillator frequency is increased; if it is lower, the frequency is decreased. This allows the PWM controller to maintain a constant output current and thus output voltage regulation.The adjustable output voltage feature is accomplished by utilizing the VREF pin voltage. By setting the VREF pin voltage to the desired output voltage level, the PWM controller keeps the internal reference voltage at the correct level.In order to protect the ZL2106ALCFT from excessive current consumption or high temperatures, it features several protection features, such as a short-circuit protection, over-voltage protection, over-temperature protection, and open-circuit protection.

Conclusion

The ZL2106ALCFT DC/DC switching regulator from Texas Instruments is a high current output regulator designed for applications requiring a adjustable, stable output voltage. It features a 4A continuous mode output current, adjustable output voltage range of 2.5V to 6V, input voltage range of 4V to 30V, switch frequency of 400kHz, and an efficiency up to 97%. The ZL2106ALCFT is used in many applications from board power supplies to industrial control and instrumentation. Its average-current mode control architecture with variable frequency oscillator allows for precise output voltage regulation and protection from current overloads and high temperatures.

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