TL2842BDR-8 Integrated Circuits (ICs)

Frequency - Switching:	Up to 500kHz
Base Part Number:	TL2842B
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	96%
Series:	--
Voltage - Supply (Vcc/Vdd):	10 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback, Forward
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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TL2842BDR-8 application field and working principleThe TL2842BDR-8 is a bidirectional, current-mode, pulse-width modulation (PWM) synchronous buck switching controller designed for DC-DC conversion applications. This controller implements a constant on-time (COT) control system, allowing designers to create high efficiency, low output ripple, and fast transient response products. Features and benefitsThe TL2842BDR-8 features several advantages to maintain high performance, including:- An adjustable power supply turn-on digital delay timer- Fault protection with independent synchronization of the output MOSFETs - Transform feedback voltage compensation and digital pulse-width modulation (PWM) control- Low output voltage detect trip point with digital delay timer for automatic output voltage recovery- An oscillator with an adjustable frequency to optimize efficiency at any load- Adjustable switching frequency for improved electromagnetic compatibility- Adjustable phase advance for improved transient responseApplications The TL2842BDR-8 can be used in a variety of applications, from laptop and tablet computers to motor control applications. It is ideally suited for high power DC/DC conversion applications, such as voltage down-conversion and boosting.In addition, the TL2842BDR-8 can be used in applications such as: - Battery chargers - Low voltage DC/DC converters- High voltage DC/DC converters- Ultrasonic motor control- Charge pumps - PoE (Power over Ethernet)Working principleThe TL2842BDR-8 is a voltage mode, current mode (CM) PWM synchronous buck controller. It operates in constant on-time control mode (COT) with low duty cycle to maintain a low duty cycle-to-duty cycle ripple. The TL2842BDR-8 has a fixed oscillator frequency, but it also has an adjustable phase advance circuit that optimizes the transient response of the system.The controller monitors the output voltage through the feedback divider. When the output voltage exceeds the user-set voltage setting, the controller reduces the duty cycle to maintain the set voltage. When the output voltage drops below the setting, the dutycycle increases to bring the output voltage back to the pre-set level. The TL2842BDR-8 PWM buck controller has two separate gate drives for each synchronous MOSFET. The two gate drivers are synchronized through the sync signal and ensure that an independent shutdown of the two MOSFETs can be programmed. In addition, the TL2842BDR-8 includes an adjustable power on digital delay timer that can be used to ensure the power supply is completely on before the system is operative. This helps to ensure that the load circuit has sufficient time for power-on self-testing during start-up.Conclusion The TL2842BDR-8 is a versatile, reliable, and high-performance bidirectional PWM synchronous buck controller that can be used in a variety of applications. Its constant on-time (COT) control system and adjustable frequency offer improved power efficiency and fast transient response. The device also features fault protection, synchronization of the output MOSFETs, and an adjustable power on digital delay timer to guarantee safety and optimal performance.

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