ADP1720-3.3-EVALZ

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The ADP1720-3.3-EVALZ is an evaluation board for a low-dropout, low-noise linear voltage regulator designed to provide single-supply, low-dropout regulated 3.3V output from a wide input voltage (up to 28V). It is part of the growing category of Evaluation Boards - Linear Voltage Regulators (LVRs) designed to provide cost-effective and reliableDC power circuits for a wide range of applications.

The board uses the National Semiconductor ADP1720 low drop-out regulator (LDO), capable of delivering up to 1.2A output current from input voltage up to 28V. The output voltage is adjustable over a wide voltage range of 3.3 – 5.5V, allowing the user to control the voltage of the output with excellent accuracy and tight regulation. The low noise, low dropout and high accuracy performance of the ADP1720, along with its wide temperature range operating capability, makes it one of the most advanced linear voltage regulator ICs available for power conditioning circuits.

The ADP1720-3.3-EVALZ evaluation board comes with several protections to ensure safe operation including overvoltage protection, over current protection, soft start, thermal shutdown and high surge rated transient overvoltage protection. The onboard control loops make the ADP1720-3.3-EVALZ an ideal choice for automotive, medical and industrial applications.

In addition, the ADP1720-3.3-EVALZ can be used as a general purpose power supply for single-supply dc-dc converter applications, allowing a wide input voltage range of up to 28V. It can also be used to power sensitive loads, such as those associated with sensitive data processing, via the use of a combination of input voltage transformation, filtration and regulation for noise-free output current. The voltage regulator has an efficient, low-power design, allowing it to provide the desired output voltage with minimal heat buildup.

The principal application of the ADP1720-3.3-EVALZ is as a power conditioning and protection board for low-cost, low-power consumer electronics, such as digital cameras, camcorders, portable media players, personal electronic devices and other low-power, high-capacity electronic devices. It is also suitable for industrial equipment, automotive systems, telecommunications systems, medical instruments, and others requiring dc-dc power regulation.

The working principle behind the ADP1720-3.3-EVALZ involve the following steps:

• The first step involves the input voltage transformation and filtration, which stabilizes the supply voltage to the output.
• The second step involves the voltage regulation, which has two stages. The first stage involves the setting of the desired voltage output internal using a reference voltage and an external resistor divider, while in the second stage, the internal operational amplifier is used to control current from the output and match the output voltage to the reference voltage.
• The third step involves the thermal protection, which prevents the voltage regulator from overheating. The ON/OFF pin is used for this purpose.
• The fourth step involves the overvoltage protection, which guards from the effects of voltage transients caused by power loss, surge or induction. This protection includes a special zener diode, detection circuitry and clamping diodes.

These steps all work together to ensure that the board can accurately regulate its output voltage within a range of 3.3 – 5.5V with excellent accuracy and tight regulation. The ADP1720-3.3-EVALZ allows the user to easily design a low-cost, low-power regulated power supply with the highest levels of efficiency, noise-free output current and minimal heat buildup. It also offers several additional features, such as an operating temperature range of – 40C to + 85C, an adjustable soft-start circuit, an overvoltage protection circuit, a fault output to indicate an overcurrent fault, a thermal shutdown, and an inrush current limit. With its user-friendly design, ease of use, and excellent performance, the ADP1720-3.3-EVALZ is an ideal choice for a wide range of applications.

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