TL3843BP

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The TL3843BP is a DC-DC switching controller with an application field of step-down voltage conversion, and its working principle is based on Pulse Width Modulation (PWM) control. It is a component of the Texas Instruments (TI) PMIC - Voltage Regulators - DC DC Switching Controllers family. The TL3843BP is capable of carrying out bulk-capacitor schemes, thereby enabling applications that require low current during standby periods. It supports real-time cycle-by-cycle peak current limit for excellent current delivery. It is also capable of operating in forced pulse-by-pulse current limit mode for added reliability.

The TL3843BP integrates power metal-oxide semiconductor field-effect transistors (MOSFET) drivers with an advanced on-chip pulse width modulation (PWM) controller to provide accurate output voltage regulation, allowing simple construction and high efficiency. It can deliver up to 3A output current into a 3.3V system operating over a wide supply voltage range of 4.5-36V, based on the voltage difference between the load voltage and the input voltage. The device also provides a duty-cycle control circuit with a PWM duty-cycle range of 0.5% to 99.5%.

The TL3843BP also integrates several additional features that allow a precise and flexible control of the load. These features include programmable line/load regulation, fixed/programmable soft-start, programmable line feedforward compensation, regulated input to the Local Sense (LS) amplifier for remote sensing accuracy and transient response, output voltage clamp, programmable deadtime and integrated soft-stop.

The TL3843BP also provides Smart Power-Down (SPD) features, allowing the device to automatically enter low-power mode when the load demand is low. In this way, the TL3843BP consumes little power during light-load operation and provides lower system losses, resulting in an improved overall efficiency. The device also has multiple programmable fault and protection features that protect the device from frequent faults and increase its reliability. The device has an adjustable soft-stop current limit that ensures a smooth re-start of the system after a shutdown. Furthermore, the TL3843BP provides a programmable overvoltage protection (OVP) that limits the output voltage to a preset level.

In summary, the TL3843BP is a DC-DC switching controller with an application field of step-down voltage conversion and working principle based on PWM control. It is an advanced device that can deliver up to 3A output current into a 3.3V system operating over a wide supply voltage range of 4.5-36V. It also provides Smart Power-Down (SPD) mode, multiple programmable fault and protection features and adjustable soft-stop current limit, ensuring a smooth re-start and increased reliability. This device is an excellent choice for various DC-DC applications that require low current during standby periods.

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