Frequency - Switching:	300kHz
Base Part Number:	TL594
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Dead Time Control, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	48%
Series:	SWITCHMODE™
Voltage - Supply (Vcc/Vdd):	7 V ~ 40 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck, Push-Pull
Output Configuration:	Positive
Function:	Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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TL594CDR2 Application Field and Working Principle

Introduction

The TL594CDR2 is a high performance power switch that is part of the DC/DC Switching Controllers product family from Texas Instruments. It is a single-stage current-mode converter which is ideal for cost-sensitive applications. It delivers excellent efficiency and fast transient response. The TL594CDR2 provides integrated protection functions, including overvoltage, undervoltage, overcurrent, overtemperature, and an enable input. It also has an internal high volt input, an on-chip current sense and reference, a precision error amplifier, an integrated ramp oscillator, and dead time control.

Application Field

The TL594CDR2 can be found in numerous applications, including notebook PCs, LCD and plasma displays, solar systems, gaming consoles and other home electronics, automotive subsystems, data center power supplies, small embedded DC/DC converters, point-of-load (POL) and industrial control systems.The integrated high voltage switching, current sense, reference, error amplifier and ramp oscillator functions, combined with the comprehensive on-chip protection, make the TL594CDR2 an ideal power switch for advanced power stage designs. It has an adjustable soft-start and a system-level enable control that eliminates the need for a separate soft-start circuit and reduces system costs.

Working Principle

The TL594CDR2 works by using a high-voltage input and a current-mode control architecture. It uses an internal high voltage switch to control the voltage of the output. The switching frequency is controlled by an integrated ramp oscillator and is adjustable from 300 kHz to 500 kHz.The device also has an on-chip current sense amplifier with an integrated reference that is used to monitor the output voltage. The current sense level is programmable from 0 to 6 volts. The current sense amplifier is used to detect when the output of the power switch is approaching its maximum, and the device reduces the duty cycle of the switch in order to avoid exceeding the maximum output voltage.The device also has several protection functions, including overvoltage, undervoltage, overcurrent and overtemperature. The overvoltage and undervoltage protection circuits monitor the output voltage and turn off the switch when it exceeds the set limits. The overcurrent protection circuit monitors the current of the power switch at the power stage output and turns off the switch when it exceeds the set limit. The overtemperature protection circuit monitors the junction temperature of the power stage and turns off the switch when its junction temperature exceeds the set limit.The device also has an adjustable soft-start circuit, which is used to ramp up the output voltage during power-up. This prevents large inrush currents from occurring on the output.Finally, the device has an enable pin that can be used to turn off the output for system shutdown or reset.

Conclusion

The TL594CDR2 is an ideal power switch for cost-sensitive applications. It has an integrated high voltage input, current sense and reference, precision error amplifier, integrated ramp oscillator, and dead time control, combined with comprehensive on-chip protection. The device provides excellent efficiency and fast transient response, as well as adjustable soft-start and system-level enable control. It is suitable for a wide range of applications, including notebook PCs, LCD and plasma displays, gaming consoles, data center power supplies, and small embedded DC/DC converters.

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