TL3844D

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TL3844D application field and working principle

TL3844D is a kind of PMIC (Power Management Integrated Circuit) device, which is categorized into the Voltage Regulators section and especially into the DC/DC Switching Controllers. This device is able to generate bias and low-noise supplies with high power savings necessary for audio applications. It is designed basically to be used as an adjustable current mode device.TL3844D is basically a voltage-mode Pulse Width Modulation (PWM) controller which comprises an internal Level-Shifted, Fixed-Frequency, adjustable PWM housed inside 8 lead PDIP and SOIC packages. This device contains several features like TTL and CMOS compatible logic shutdown, thermal shutdown and maximum current protection and has a wide range of applications such as lighting controller, white goods and an array of other communications equipments.

Applications

Speaking of the applications of TL3844D, this device is applicable in the following fields:

• Voltage Mode PWM Controller
• Digital Amplifiers
• Bipolar Supply Generators
• DC/DC Switching Controllers
• Flyback Power Supply Controller.

Features

TL3844D has many features which make it stand out among other similar devices.

• Internally fixed-frequency oscillator.
• Provides standard Pulse Width Modulation (PWM) type switching control with voltage mode operations.
• On-chip level-shifted circuitry for opposing bipolar supplies.
• Precision adjustable frequency and adjustable dead time.
• Under/over voltage protection.
• Input logic shutdown control.
• Thermal shutdown for positive and negative supplies.
• Inverting enable input.
• Output open-collector.
• Maximum current protection.
• Stable with small RC component values.
• Operating temperature range between -20 ° C to +85 ° C.

Working Principle

At the heart of TL3844D lies the PWM technology. It is basically a voltage-mode circuit that has an internally fixed-frequency oscillator in it. This combination of features makes it an ideal choice for voltage mode PWM controller applications. As already mentioned, this device has an adjustable pulse width frequency ranging from 3Khz to 400Khz, an adjustable dead time, and input logic shutdown control, under/over voltage protection, thermal shutdown, and maximum current protection.TL3844D works in two steps. First, the oscillator produces a clock signal at the desired frequency. This clock signal is then used to generate an internal level shifted pulse width modulated (PWM) signal. This PWM signal is then applied to an external loop filter to produce a well-regulated output voltage. A feedback loop is also used to compare the output voltage with a reference voltage and maintain the desired voltage regulation.

Conclusion

TL3844D is a PMIC device designed for audio applications which offers several features like adjustable current mode, high power savings, TTL compatible logic shutdown, and thermal shutdown. This device is broadly used in applications like voltage mode PWM controllers, digital amplifiers, bipolar supply generators, flyback power supply, etc. Its working principle revolves around the internal fixed-frequency oscillator, the level-shifted PWM signals and the control loop to compare the output voltage with a reference voltage and keep the desired voltage regulated.

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