TL3843BD

Series:	--
Packaging:	Tube
Part Status:	Active
Output Type:	Transistor Driver
Function:	Step-Up, Step-Up/Step-Down
Output Configuration:	Positive
Topology:	Boost, Flyback, Forward
Number of Outputs:	1
Output Phases:	1
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 V
Frequency - Switching:	Up to 500kHz
Duty Cycle (Max):	96%
Synchronous Rectifier:	No
Clock Sync:	No
Serial Interfaces:	--
Control Features:	Frequency Control
Operating Temperature:	0°C ~ 70°C (TA)
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	14-SOIC
Base Part Number:	TL3843B

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PMIC - Voltage Regulators - DC DC Switching Controllers

The TL3843BD is a bipolar monolithic integrated circuit for the closed-loop control of dc-dc switching regulators. It includes the optimal features for use in off-line, isolated, fixed-frequency current-mode control systems. Features of this device include precision trimming for reference voltage, temperature compensation, short-circuit protection, cycle-bycycle current limiting, synchronized operation, and programmable deadtime.

TL3843BD Overview

The TL3843BD was designed to provide designers with a simple and inexpensive solution to generate cost-effective, low-cost converters in a wide range of output voltages. This device consists of a reference voltage generator circuit, voltage error amplifiers, current sensing comparators, pulse-by-pulse current limiting, undervoltage lockout, synchronizer and deadtime generator.The TL3843BD operates in a constant frequency, peak current mode. The reference voltage generator circuit provides a stable, low-distortion output voltage to regulate the output of the design. The synchronizer circuit provides for the synchronization of the output switching frequency with an external clock signal applied to the SYNC pin. The deadtime generator allows for programming of the deadtime between the rising and falling edges of the switching signal.

TL3843BD Application Field

The TL3843BD is used in a wide range of applications including off-line and isolated AC/DC power supplies, DC/DC converters and motor drivers. It can also be used for LED drivers, and telecom, computer, and industrial applications.

TL3843BD Working Principle

The TL3843BD operates in a constant frequency, peak current mode. The reference voltage generator circuit provides a stable, low-distortion output voltage to regulate the output of the design, while the voltage error amplifiers sense the deviation of the feedback voltage from the reference, and amplify it to a suitable level for use by other circuits in the system.The current sensing comparators monitor the peak output current and compare it to the current limit set by the resistor connected to the CURRENT LIMIT pin of the device. The converter is prevented from exceeding the set current limit by the pulse-by-pulse current limiting feature. The undervoltage lockout (UVLO) circuit is provided to ensure the stability of the power supply.The TL3843BD also provides programmable deadtime and synchronizer circuits, both necessary to ensure EMI compliance. The synchronizer circuit is used to provide synchronization of the output switching frequency with an external clock signal applied to the SYNC pin. The deadtime generator allows for programming of the deadtime between the rising and falling edges of the switching signal.The TL3843BD closes the loop by providing the appropriate drive signals to the power switch, which in turn provides the power to the load. The output voltage is sensed, amplified, referenced and compared with the reference voltage to generate the appropriate drive signals for the power switch. The output voltage will remain constant even when the input voltage or the load changes.

Conclusion

The TL3843BD is a monolithic integrated circuit for the closed-loop control of dc-dc switching regulators. Its features include precision trimming for reference voltage, temperature compensation, short-circuit protection, cycle-by-cycle current limiting, synchronized operation, and programmable deadtime. It is used in a wide range of applications including off-line and isolated AC/DC power supplies, DC/DC converters and motor drivers, LED drivers, and telecom, computer, and industrial applications. The TL3843BD closes the loop by providing the appropriate drive signals to the power switch, which in turn provides the power to the load. The output voltage is sensed, amplified, referenced and compared with the reference voltage to generate the appropriate drive signals for the power switch. The output voltage will remain constant even when the input voltage or the load changes.

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