TL3844BP

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TL3844BP is an efficient, monolithic step-down DC-to-DC switching controller with selectable 7V or 8V undervoltage lockout thresholds and an adjustable PWM output frequency up to 500 kHz. It is a member of National Semiconductor\'s Eco-sensitive product range and is specifically designed to reduce total power consumption while using a very low operating current. TL3844BP mainly used in battery-operated applications, DC to DC converters, distributed power systems and other supply regulation applications. The following content will introduce the application field and working principle of TL3844BP in detail.

Application Field of TL3844BP

The TL3844BP is a monolithic switching-mode DC-to-DC controller with wide input voltage ranges from 6V to 38V. It features high current drive capability, selectable 7V or 8V undervoltage lockout thresholds, integrated soft start circuitry as well as adjustable PWM output frequency up to 500kHz. It is specifically designed for battery-operated applications and DC to DC converter systems where total power consumption needs to be minimized. Typical applications include distributed power systems, PCAT, process control, medical and instrumentation.

The output voltage of TL3844BP can be trimmed using the on-chip Rset and differential remote sensing circuit. The environment friendly, Eco-sensitive product range of TL3844BP allows to reduce the ripple in regulated output voltage without increasing the size and cost of the power supply. The supply voltage of the controller operates up to 45V and works over the temperature range of -40℃ to +85℃.

working principle of TL3844BP

The TL3844BP is the enhanced version of the TL384x, an efficient step-down DC-to-DC converter with wide input voltage range. It works by first converting a DC voltage into a stepped-up voltage before converting into a stepped-down voltage. This increases the efficiency of the controller and reduces power consumption.

The TL3844BP features selectable 7V or 8V undervoltage lockout thresholds, a dedicated sync pin for external synchronization of the PWM signal, and an adjustable PWM output frequency up to 500 kHz. The PWM signal is created by comparing the sensed output voltage to the internal reference voltage, and is then used to control a MOSFET switch. The PWM signal can be synchronized externally by an external clock signal. When the input voltage surpasses the UVLO threshold, the MOSFET switch will be turned on and the output voltage is pulsed through the switch on a fixed frequency.

The TL3844BP also contains an integrated soft start circuitry, allowing the output voltage to ramp up slowly and eliminate instantaneous surges. This also reduce the stress on the MOSFET related to every switching cycle, thus protecting the device and improving system reliability. The integrated low dropout (LDO) voltage regulator further reduces system power consumption, and the dual-rail supply regulator ensures that the device does not output large current spikes in off-regulated states.

Conclusion

TL3844BP is a low power, efficient step-down DC-to-DC switching controller with selectable 7V or 8V undervoltage lockout thresholds, an adjustable PWM output frequency up to 500 kHz, and an integrated soft start circuitry. Its wide operating voltage range makes it suitable for battery-operated applications, distributed power systems and other supply regulation applications. Its power minimization features ensure low power consumption for applications requiring long operating life and high energy efficiency.

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