UC3835N

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The UC3835N is classified as a Linear Regulator Controller (LRC) under the category of Voltage Regulators, commonly found in Power Management Integrated Circuits (PMIC). This device acts as a switching power supply controller, designed to supply a wide input predictive voltage range of 3.5V to 32V and a output range of 0.5V to 36V. Designed originally with cost efficiency and space saving in mind, the UC3835N has become increasingly popular due to its incredibly efficient and reliable performance. With a peak power efficiency of 97%, this LRC provides the most cost effective solutions for applications requiring both high current and low-input voltages.

The UC3835N operates by returning a regulated output voltage to a selected load, with a pre-determined voltage margin. The regulation loop works by continuously measuring the sensed output voltage and comparing it to the reference voltage. If the sensed voltage is more than the reference voltage, the System Control registers this and commands the device to start up its On-Time generator and generate the output. If the sensed voltage is below the reference voltage, the Off-Time generator is triggered and removes the output voltage.

The UC3835N’s pulse-width modulation (PWM) mode is controlled by an internal comparator that compares an internally generated triangle waveform to the get chopped by an analog voltage into a variable duty cycle pulse-width modulated signal. The comparator is monitored by an internal oscillator, which sets the on-time of the PWM output. The PWM mode is used to regulate power by varying the triangular waveforms’ frequency. This mode can be used at higher voltage supply ratings to manage high power applications, providing improved switching efficiency and considerably less power dissipation.

The UC3835N utilizes various additional features that enables its users to control the output voltage accurately, safely, and efficiently. Sense Pins allow the load to be connected directly to the controller, allowing for a load dependent triggering of the PWM signal. A temperature compensation feature enables current limiting and temperature dependent on-time duration. This is especially useful where products are required to have thermal protection. Finally, the UC3835N’s line-σ feature ensures the output voltage to stay within a certain range, even if the input line voltage drifts. Thanks to all these features, the UC3835N provides optimum current and thermal protection for applications that require high current and low input voltages.

The UC3835N is a versatile, reliable and cost-effective LRC solution for applications that require a wide range of input voltage ranges and higher power efficiencies. Its PWM control mode provides further capabilities for applications where high power is required. The many additional features provided by this power management integrated circuit make it a great choice for managing high power applications safely, efficiently and cost-effectively.

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