LM20242EVAL/NOPB

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The LM20242EVAL/NOPB is an evaluation board designed for DC/DC and AC/DC (Off-Line) switch-mode power supplies (SMPS). It is widely used in various applications ranging from battery charger systems to consumer appliances, computers, as well as lighting and automotive applications.

The board features an integrated controller, IC LM20242, which provides peak current mode control with a 16.5V to 57V wide input range. Moreover, it has an optional external loop compensation and also offers a wide adjustable output voltage from 1V to the input voltage.

In order to ensure the maximum efficiency, LM20242EVAL/NOPB incorporates a synchronous operation with synchronous rectification. It has a 2.5 A peak current rating, with a switch current limit of 1.5 A. A frequency jitter modulation technique is used to reduce the electromagnetic interference (EMI).

The board also features a number of protection mechanisms such as over-voltage (OVP), current limit (IOC), output short-circuit (SC), over-temperature (TSD), as well as an external OCD input. Moreover, it has few external components to minimize the bill of materials and simplify the design.

The working principle of the LM20242EVAL/NOPB evaluation board is quite simple. The integrated controller IC LM20242 receives the input voltage from the DC source and converts it into a regulated output voltage. It does this by using a resonant network of inductors, capacitors and transistors to produce a pulse width modulated (PWM) signal. The PWM signal is then used to switch the power transistors at the required frequency and duty cycle to maintain the desired output voltage.

The board also includes a few external components such as a current sense resistor, a feedback network, and output capacitors. The current sense resistor senses the current across the output of the power stage for over-current protection. The feedback network senses and compares the output voltage with the reference voltage to ensure regulation at the output. The output capacitors provide the necessary energy storage and filtering to further reduce EMI.

In summary, the LM20242EVAL/NOPB evaluation board is an efficient tool for DC/DC and AC/DC (Off-Line) switch-mode power supplies designs. It is highly efficient, integrates all the necessary components, and is easy to use. It has a wide input range, adjustable output voltage, multiple protection mechanisms, and is suitable for a wide range of applications.

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