LM20134MHX/NOPB Integrated Circuits (ICs)

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The LM20134MHX/NOPB is part of the Texas Instruments LM20134 family of integrated pulse-width modulation (PWM) DC-to-DC switching regulators. They control the output voltage of a DC-to-DC converter within a wide range of acceptable voltage levels by providing a regulated voltage supply to the load. Having high efficiency, low-loss heat dissipation, and wide input voltage range, the LM20134MHX/NOPB is suitable for use in automotive and industrial applications.

In general, the LM20134MHX/NOPB is a device intended for use as a regulated power converter. It features a high-side switch, a low-side switch, a synchronous rectifier, current sense circuits, integrated over-current, under-voltage, and over-voltage protection, and voltage regulation capability.

The working principle of the LM20134MHX/NOPB is based on the classic hysteretic control topology. This topology also provides fast transient response and excellent line/load regulation, allowing highly efficient operation over a wide range of load conditions and input voltages. The hysteretic control loop produces precise voltage regulation accuracy and fast transient response. The low-side output of the PWM comparator is inverted before being sent to the high-side switch. The dc value of the ripple voltage present at the output is compared to a center voltage reference. The error voltage, which is the difference between the two, is compared to a hysteretic band, and when the error voltage is larger than the threshold, the output will switch on. Thus, depending on the load and voltage conditions, the duty cycle of the output of the PWM comparator is adjusted to ensure that the output voltage remains within the desired range.

The LM20134MHX/NOPB is most suitable for automotive, industrial, and LED lighting applications due to its wide input voltage range (4.5V to 38V), wide output voltage range (4.5V to 38V), low ripple noise, low EMI, as well as protection features such as over-current, under-voltage, and over-voltage protection. It is also a suitable choice for portable systems, such as mobile phones and PDAs, where high efficiency and miniaturization are important system goals.

It is important to note that the LM20134MHX/NOPB can be used in either a buck (step down) or boost (step up) configuration, allowing designers to regulate their output voltage from 4.5V to 38V. The device also features a synchronous rectifier function that boosts efficiency, as well as an output synchronization feature that allows it to output a synchronized signal to another regulator in order to reduce noise.

In summary, the LM20134MHX/NOPB is a pulse-width modulation DC-to-DC switching regulator suitable for automotive, industrial, and LED lighting applications, as well as portable devices. It features an excellent transient response, over-current, under-voltage and over-voltage protection, and both buck and boost configurations. The LM20134MHX/NOPB also has a synchronous rectifier function and an output synchronization feature, allowing it to reduce noise and boost efficiency.

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