ISL95338EVAL1Z

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The ISL95338EVAL1Z is an easy to use evaluation board used to test the capabilities of the Intersil ISL95338 multi-output 6A, wide-input voltage DC/DC and fixed frequency PoC™ integrated switcher. This evaluation board provides three individual output voltages: 5.0V, 1.5V, 0.8V and is designed to drive loads of up to 6A. This evaluation board offers a very convenient example of how an Intersil ISL95338 multi-output 6A, wide-input voltage DC/DC and fixed frequency PoC integrated switcher can be used to obtain multiple output voltages.

The primary purpose of the ISL95338EVAL1Z is to provide a platform with which developers can quickly evaluate the various features and functions of the Intersil ISL95338 switcher. Some of these features include a wide 4.5V to 34V input voltage and an operating frequency of 300kHz. This evaluation board also offers the ability to select up to 3 output voltage combinations- 0.8V, 1.5V and 5.0V. In addition, the board also provides up to 6A of output current.

The ISL95338EVAL1Z uses several key components to evaluate the Intersil ISL95338—a shunted current share field-effect transistor (FET), two voltage regulators (VRs), an IC buck regulator (ICBR), an oscillator, a reference voltage and two voltage multipliers. All of these components are designed to work together to provide great performance and excellent efficiency.

The shunted current share FET, also known as a “StripFET”, is responsible for providing the primary control element for the ISL95338EVAL1Z. This device is designed to switch between two different voltage levels—5V and -5V—in order to regulate the output voltage of the board. The shunted current share FET also has the capability to reduce the switching losses of the board by using an internal diode and capacitive current shape Pulse-Width Modulation (PWM).

The boards’ two voltage regulators, VR1 and VR2, are responsible for providing the secondary control element for the board. The VR1 regulator controls the output voltage while the VR2 regulator is responsible for providing a reference voltage for the board. The reference voltage provided by the VR2 is the basis upon which the board’s actual output voltage is established.

The board also features an IC buck regulator and an oscillator. The IC buck regulator is responsible for driving the board’s primary switch—in other words, it regulates the amount of current passing through the shunted current share FET. The oscillator is responsible for generating the board’s pulse-width modulation signal. This signal is responsible for controlling the shunted current share FET and, in turn, regulating the board’s output voltage.

Finally, the board also includes two voltage multipliers. These two voltage multipliers are responsible for increasing the board’s operating voltage from its minimum value of 4.5V to its maximum value of 12V. This increased voltage is then passed through the VR1 regulator in order to produce the board’s desired output voltage.

In summary, the ISL95338EVAL1Z evaluation board is an ideal tool for developers looking to evaluate the features and functions of the Intersil ISL95338 multi-output 6A, wide-input voltage DC/DC and fixed frequency PoC integrated switcher. This evaluation board allows users to quickly and easily test the various capabilities of the device, including its ability to provide up to three different output voltage combinations—0.8V, 1.5V and 5.0V—as well as up to 6A of output current.

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