UC2825ANG4

Frequency - Switching:	400kHz ~ 1MHz
Base Part Number:	UC2825A
Supplier Device Package:	16-PDIP
Package / Case:	16-DIP (0.300", 7.62mm)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Frequency Control, Ramp, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	50%
Series:	--
Voltage - Supply (Vcc/Vdd):	8.4 V ~ 22 V
Output Phases:	1
Number of Outputs:	2
Topology:	Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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UC2825ANG4 Application Field and Working Principle

DC-DC switching controllers, such as the UC2825ANG4, are a type of power management integrated circuit (PMIC) used to regulate direct current (DC) voltages. They are typically used to control the voltage levels in DC-DC switches in order to provide a stable power supply. The UC2825ANG4, in particular, is a high-performance, low-power device designed for use in consumer, automotive, and industrial applications.

Applications

The UC2825ANG4 is ideal for use in applications where cost and space are at a premium. It is designed to handle high-load current sources, as well as to provide precision and accuracy when controlling output voltages. It is well-suited for resettable fuses, DC-DC switching power supplies, graphocs motor drivers, DC motor controllers, and positive voltage source (PVS) applications.

Features and Benefits

The UC2825ANG4 provides a number of features and benefits to users, including:

• High current capability to 15A
• Low-power operation: low quiescent current and low EMI
• Wide input voltage range from 7V to 44V
• High voltage tracking accuracy
• Programmable switching frequency up to 1Mhz
• Soft start, current limit, and output overvoltage protection
• External voltage feedback control
• Integrated 580mV reference

The UC2825ANG4 can also be used to regulate highly accurate output voltages across various load levels.

Working Principle

The UC2825ANG4 operates using a constant-on-time control scheme. It behaves like a linear regulator, but has the advantages of high efficiency and low EMI. It works by adjusting the on/off ratio of the supplied voltage and decreasing the on-time when the load current increases. This allows for accurate control and precise regulation of the output voltage. The UC2825ANG4 also features external voltage feedback control, allowing users to adjust the output voltage via an external divider. This allows users to optimize the UC2825ANG4’s performance when used in variable load applications.

Advantages over Linear Regulators

DC-DC switching controllers provide several advantages over linear regulators, including:

• Higher efficiency: switching controllers are more efficient than linear regulators at medium to high load currents
• Smaller size: switching controllers require less components, resulting in smaller overall size
• Greater power density: switching controllers generate higher power in a smaller area than linear regulators
• Wider input voltage range: switching controllers can accommodate wider input voltage ranges than linear regulators
• Lower quiescent current: switching controllers have lower quiescent current than linear regulators
• Better transient response: switching controllers have better transient response than linear regulators
• Simpler design: switching controllers have simpler circuitry than linear regulators

Conclusion

The UC2825ANG4 from Texas Instruments is a low-power, high performance DC-DC switching controller designed for use in both consumer and industrial applications. It utilizes a constant-on-time control scheme and features external voltage feedback control for variable load applications. The UC2825ANG4 provides numerous benefits compared to linear regulators, including increased efficiency, smaller size, greater power density, wider input voltage range, lower quiescent current, and better transient response.

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