TL1454ACDR

Frequency - Switching:	50kHz ~ 2MHz
Base Part Number:	TL1454A
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-20°C ~ 85°C (TA)
Control Features:	Dead Time Control, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	3.6 V ~ 20 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck, Boost, Flyback
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Discontinued at Digi-Key
Packaging:	Tape & Reel (TR)

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TL1454ACDR Application Field and Working Principle

Introduction

TL1454ACDR is a DC-to-DC switching controller IC that provides high-accuracy, monolithic regulation and control of output voltage and current. This IC belongs to the PMIC- Voltage Regulators-DC DC Switching Controllers category. It is used in the wide range of industrial, office, vehicle and home automation applications.

Features

The TL1454ACDR has an optimized design to deliver 24V input-output differential and 40V output rating, with a operating temperature range from -40 °C to 85 °C. The current mode operation with its visible analog output (i.e voltage sensing accuracy is ±1%) ensures a wide range of input voltage and output voltage with a compact design compared to other controllers. It includes spike tolerant inputs and integrated soft-start protection to prevent over-voltage and over-current conditions.1

Application Field

The TL1454ACDR is an ideal solution for DC-DC applications with stringent performance and reliability. It is suitable for use in industrial and home automation systems where highly efficient, space saving and reliable power control is required.For example, the TL1454ACDR is used in the charging systems of electric vehicles and other high-power applications. It can also be used in battery-powered applications such as LED lighting, satellite navigation systems and portable devices. The power conversion efficiency obtained from this DC-to-DC switching controller IC can be up to 95%, due to its high integration and low external component count.2

Working Principle

The TL1454ACDR is based on the current mode switching architecture, providing high-accuracy, monolithic regulation and control of output voltage and current. The device operates in three different modes, as listed below:1. Quiescent or "Off" Mode - this mode is used to switch off the output voltage and completely disconnect the load from the source.2. Active Mode - the active mode is when the device is providing a regulated output voltage and current.3. Circuit Protection Mode - this mode is used to protect the controller and load in the event of an over-current or over-voltage condition.The device relies on the constant current signal generated by the internal oscillator to control the switching waveform. This waveform is then converted into a regulated output voltage. The output voltage is further monitored and programmed by sensing the voltage and current of the regulator in the external feedback network.

Conclusion

The TL1454ACDR is a DC-to-DC switching controller with high-accuracy, monolithic regulation and control of output voltage and current. It has a wide operating temperature range and optimal power conversion efficiency. This switching controller is suitable for industrial and home automation systems, electric vehicles, satellite navigation systems and battery-powered applications. The integrated soft-start protection prevents over-voltage and over-current conditions. The device is based on current mode switching arcitecture that converts a constant current signal into a regulated output voltage.

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