UCC3803PWG4

Frequency - Switching:	31kHz
Base Part Number:	UCC3803
Supplier Device Package:	8-TSSOP
Package / Case:	8-TSSOP (0.173", 4.40mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	3.6 V ~ 12 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck, Boost, Flyback, Forward Converter
Output Configuration:	Positive
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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UCC3803PWG4 Application Field and Working Principle

PMIC (Power Management Integrated Circuit) has a major role in how today\'s electronics are designed by offering a variety of solutions to help manage and optimize the flow of energy into and out of a device\'s power supply. Voltage regulators and DC-DC switching controllers are essential components for this purpose. The Texas Instruments UCC3803PWG4 is an adjustable off-time, current-mode switching regulator controller that is designed for step-down and step-up DC to DC converter applications such as load-disconnected buck converters, push-pull, flyback, and forward converters. This device is available in a space-saving 8-pin, thermally enhanced PowerPAD™ package (Tssop-8) and operates at up to 600 KHz. It integrates wide input and output voltage range, a high-current totem-pole output stage, a high efficiency voltage regulator, slew rate control, and other features.

Types of Operation and Features

The UCC3803PWG4’s operating mode can be selectable through an external pin between the Pulse-Width Modulation (PWM) mode ideal for low noise applications and a Pulse Frequency Modulation (PFM) mode. The adjustable off-time feature provides a solution for demand of high-efficiency under light/medium/heavy loads, reducing sound pressure levels. The UCC3803PWG4 also provides the necessary frequency jitter on its output signal providing high EMI performance at a constant frequency. Other features include:

• Programmable dead time for zero-voltage switching reduces switching losses
• Internal error amplifier
• Programmable current-limit impedance
• Extended output load capability
• Thermal shutdown protection with hysteresis
• Bidirectional programmable slew rate control
• Reverse blocking protection
• Wide input voltage range from 2.5V to 36V
• Wide output voltage range from 0.8V to 36V
• Low quiescent current architecture

Internal Architecture

The internal architecture of the UCC3803PWG4 consists of several high- performance components that make it a versatile high-performance controller with integrated safety features. It contains a high-speed error amplifier (EA), current-limit comparator (CLC), controlling MOSFET driver (MD), and internal voltage regulator (VR). The EA is responsible for regulating the output voltage by comparing it with an internal reference and generating an error signal. The CLC provides over-current protection by monitoring the power output of the controller. The MD drives a MOSFET connected between the Output and Input side to create a power converter. The VR provides a power supply to the internal blocks.

Working Principle

The idea behind the UCC3803PWG4 is to create a voltage regulator that is capable of working with different input and output voltages and operating modes.When operating in PWM mode, the operational timing of the UCC3803PWG4 is based on the error comparison of the output voltage against an internal adjustable bandgap reference. Through the EA, the controller provides precise regulation in its output voltage. The CLC is implemented with a voltage divider and its reference voltage is adjustable with a single external resistor.When the input voltage rises above the output voltage more than a predetermined amount, the internal high-side MOSFET switches on and the programmed error-signal will cause the current-limit comparator (CLC) to quickly reach its trip point, reducing the current flow and making the MOSFET to switch off again. During the next cycle, the feedback from the error amplifier causes the input voltage to be in regulation again.When operating in PFM mode, the regulated current through the load is adjusted continuously depending on the load. When the load requires more current, the switching frequency increases, and if the load requires less current, the switching frequency reduces to reach the desired current.

Conclusion

The UCC3803PWG4 is an adjustable off-time DC-DC switching controller specially designed to work in buck, push-pull, flyback, and forward converter topologies. Its operating modes are easily selectable through an external pin, and it supports a wide input and output voltage range and slew rate control for better EMI performance. The UCC3803PWG4’s internal architecture contains a high-speed error amplifier, current-limit comparator, controlling MOSFET driver, and internal voltage regulator, which are crucial for its functioning. Its ability to work with different input and output voltages, as well as its integrated safety features, make it an ideal choice for modern DC-DC converters.

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