LM34923EVAL/NOPB

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LM34923EVAL/NOPB is an evaluation board for Linear Technologies\' LM34923 Simple Switcher Buck Regulator, part of the DC/DC & AC/DC (Off-Line) SMPS family of evaluation boards. The board is designed specifically to evaluate the performance of the LM34923 and requires minimal external components for operation.

The LM34923 is ideal for space-constrained, high-efficiency power applications such as hand-held devices, portable instruments, video cameras, and wireless communication devices. This evaluation board is designed to deliver up to 2A of output current and a nominal output voltage of 3.3V. The primary and secondary side switches feature current limiting capability and are capable of up to 90V input and up to 11V output.

The LM34923EVAL/NOPB has on-board test circuitry, such as an ESD diode, chip inductor, and ceramic capacitors, designed to reduce component count and simplify board layout. The board also features several control levers, such as frequency, output voltage, and soft-start, for easy customization. In addition, the board includes a potentiometer to fine-tune the output voltage.

The LM34923EVAL/NOPB is capable of operating in two different modes: continuous-conduction mode (CCM) and discontinuous-conduction mode (DCM). In CCM, the maximum output current is limited by the internal switches while in DCM, the maximum output current can go up to 2A. The board is also capable of delivering short-circuit protection, thermal shutdown, and input voltage protection.

The board is powered by an external power supply, typically a 12V or 24V DC power source. Once powered, the board can generate the required output voltage, depending on its settings. The operation of the board is based on the buck converter topology. It uses a switching transistor, such as a MOSFET, as a power switch to control the power supply voltage. The switching action is created by a high-frequency pulse-width modulation (PWM) signal. The pulse-width modulation is further modified by adjusting the gain and offset voltage.

The board\'s switching frequency and output voltage is determined by the settings of the control levers. When varying the frequency, the board maintains a constant output voltage, which is determined by the external power supply and the gain and offset settings of the PWM signal generator.

The LM34923EVAL/NOPB also includes numerous protection features. The board includes a short-circuit protection circuit, which turns off the power switch when the output current exceeds the set limit. The board\'s input voltage protection circuit shuts down the system when the input voltage exceeds a specified limit. Finally, the board includes a thermal shutdown circuit, which turns off the system when the temperature of the board exceeds a certain threshold.

The LM34923EVAL/NOPB is an ideal choice for designers looking for an easy-to-use, off-line, high-efficiency, space-constrained switch-mode power supply. With its low component count and simplified layout, the board provides an attractive solution for power-sensitive applications. By utilizing a buck converter topology, the board effectively delivers low output voltages with minimal power losses.

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