TC105503ECTTR

Frequency - Switching:	300kHz
Base Part Number:	TC105503
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.2 V ~ 10 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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TC105503ECTTR Application Field and Working Principle

The TC105503ECTTR is a high voltage monolithic integrated Circuit (IC) switching controller specially designed to provide regulated power supply for LED lightings. As part of the PMIC - Voltage Regulators - DC DC Switching Controllers category, the TC105503ECTTR has been designed to provide a simple, cost-effective solution to the challenge of efficient LED lighting power supply designs.The TC105503ECTTR is designed to operate from an input range of 10-90V and has an adjustable switching frequency from 30kHz up to 200kHz. The IC also features wide voltage range of 5V-85V, making it an ideal choice for applications that require a high conversion efficiency over a wide input power range. The integrated protective circuitry prevents over-current, under-voltage, short circuit, and over-temperature conditions.The primary application of the TC105503ECTTR is to drive Pulse Width Modulated (PWM) LEDs. It can also be used to power distributed power systems, uninterruptible power supplies, high-performance micro-controllers, or applications where high efficiency and output power are required.The working principle of the TC105503ECTTR is based on a technique which is commonly referred to as flyback or buck-boost topology. The IC is an integrated circuit that contains the circuitry necessary to generate a low voltage output from a high voltage input. The IC is designed to switch the power from the input source to the load depending on the load requirements. Generally, the output voltage is given as a set-point parameter that is set on the integrated circuit.The TC105503ECTTR has been designed for continuous conduction mode (CCM) operation. This works by controlling the current in the inductor and the current in the output resistance as required at a given oscillator frequency. The control of the currents translates into control of the output voltage, thus achieving regulation of the output voltage.The IC is designed to operate in both CCM and discontinuous conduction mode (DCM). The main difference between the two modes is in the input current waveform. In CCM, the input current is continuous, while in DCM the input current is discontinuous, which helps to reduce the power loss since the power is dissipated only in the on-time intervals. The IC also features an integrated 800V power MOSFET, and a wide range of high-speed protection features. The integrated safe-start feature eliminates inrush current on start-up, thus preventing false tripping. The TC105503ECTTR is also equipped with under-voltage lockout (UVLO), as well as overtemperature protection (ODP), both of which prevent damage to the controller and DC load.In conclusion, the TC105503ECTTR is an integrated circuit switching controller designed to provide efficient, reliable and cost-effective operation in the challenge of LED lighting power supply designs. The IC is particularly suited for Pulse Width Modulated (PWM) LED applications, and the integrated circuitswitch ensures continuous stable yet efficient operation even in variable load conditions.

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