TPS40021PWPR

Frequency - Switching:	100kHz ~ 1MHz
Base Part Number:	TPS40021
Supplier Device Package:	16-HTSSOP
Package / Case:	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Frequency Control, Power Good, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	95%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.25 V ~ 5.5 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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Introduction

The Texas Instruments TPS40021PWPR is a DC-DC controller that has wide applications in voltage regulation and energy management. This device has a wide range of features that enable it to satisfy a variety of applications in the industry. This paper discusses the applications and working principles of TPS40021PWPR.

Applications

The TPS40021PWPR has a wide range of applications that include:

• - High efficiency AC/DC conversion
• - Power factor correction (PFC)
• - DC/DC control
• - Battery chargers
• - Server, storage and network devices
• - Portable consumer electronics
• - Automotive electronics

It is capable of delivering an output current of up to 20A in switching mode, and it has high-side and low-side power switches. The TPS40021PWPR has the ability to operate from a wide input voltage range of 4.5V to 75V and provides an output voltage range of 0V to 25V. It also provides programmable over-voltage, under-voltage, and over-current protection.The device also provides programmable soft-start, switching frequency, and over-temperature protection features. Furthermore, it supports both low-side and high-side sense, providing improved accuracy of current sensing.

Working Principle

The TPS40021PWPR can be used as an active PFC controller or a DC-DC converter regardless of the switch size. The device can be used in both hard switching and soft switching applications. When using the device as a PFC controller, the TPS40021PWPR interacts with a PFC diode, a bypass diode, and inductors to regulate the input current and voltage. When the AC line voltage is applied, the TPS40021PWPR senses the input voltage and turns on the switch. The peak of the input voltage is then reduced and is rectified by the PFC diode.The pulses from the rectified voltage then pass through the inductor and is rectified by the bypass diode. The current is then measured by the TPS40021PWPR and then the device regulates the input current. The OVP, OCP, and OTP settings protect the device during over-voltage, over-current, and over-temperature events. When using the TPS40021PWPR as a DC-DC converter, the device uses pulse width modulation techniques to generate an output voltage. The TPS40021PWPR senses the input voltage and then turns on the switch. The inductor then stores the energy and then the TPS40021PWPR turns off the switch. The energy stored in the inductor is then transferred to the output when the switch is off. The TPS40021PWPR then senses the output voltage and turns on the switch. This process is then repeated until the output voltage is regulated to the desired value.

Conclusion

The Texas Instruments TPS40021PWPR is a DC-DC Controller that is used for the power factor correction, DC/DC conversion, and other voltage regulating applications. It has a wide input voltage range, programmable protection features, and can deliver high output current up to 20A. It can be used as an active PFC controller or a DC-DC converter, and uses advanced pulse width modulation techniques to generate an output voltage.

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