UC3836DG4

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UC3836DG4 is a high performance, fixed frequency, current-mode Pulse Width Modulation (PWM) controller that has been specifically designed for Off-Line and DC to DC converter applications. It is a linear regulator controller designed to provide lower power dissipation than other PWM controllers by reducing internal current consumption. This device is also equipped with a built-in soft-start feature, which provides a smooth power-up transition with minimal input capacitance. In addition, it contains accurate on-chip reference and current sense amplifiers. It also features frequency jittering to reduce EMI, an open-drain output pin to indicate when the output has reached regulation, and an user selectable current limit setting.

The main application fields of the UC3836DG4 include consumer electronics, such as personal computers, peripherals, office machines, and white goods. It is also well suited for use in commercial instrumentation, automotive, industrial, and telecom applications. It provides excellent line and load regulation over a wide input range while regulating the output voltage over a wide operating temperature range. The flexible IC includes a precise Regulator Voltage Reference (REFER) pin with adjustable resistor that allows the output voltage to be adjusted from 1.2V to 12V in 0.2V steps.

The UC3836DG4 has a very versatile internal circuitry, combining a latch with a low power current source, a comparator and a reference. Firstly, a constant current source supplies a voltage to the latch, which is used to adjust the duty cycle of the output voltage control signal. This signal is then compared with the reference voltage to determine the switching period of the applied pulse width modulation. In turn, the duty cycle determines the output voltage. Furthermore, the current limit is adjusted using the REFER pin, which in combination with the built-in soft-start feature helps to protect the converter from any inrush of load current.

In terms of operation, the UC3836DG4 module can be activated when the voltage at the power on-delay pin rises above 4 V. At this point, the output voltage begins to ramp up to the level set by the REFER pin. During this process, the built-in soft-start minimizes the input capacitance and with the adjustable current limit feature, further reduces the inrush current. Therefore, this IC allows the user to easily set the output voltage to the desired level while maintaining a stable output voltage over a wide operating temperature range.

In conclusion, the UC3836DG4 is an ideal solution for a wide range of linear regulator applications. This versatile IC offers high performance regulation while consuming minimal power, excellent line and load regulation over a comprehensive input range and a built-in soft-start feature. It also includes frequency jittering to reduce Electro Magnetic Interference (EMI) and an open-drain output pin to indicate when the output has reached regulation. The adjustable reference and current sense amplifiers coupled with the on-chip current limit setting makes this IC a great choice for modern designers.

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