UC3864N

Frequency - Switching:	50kHz ~ 500kHz
Base Part Number:	UC3864
Supplier Device Package:	16-PDIP
Package / Case:	16-DIP (0.300", 7.62mm)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	7 V ~ 22 V
Output Phases:	1
Number of Outputs:	2
Topology:	Full-Bridge, Half-Bridge, Push-Pull
Output Configuration:	Positive
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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UC3864N Application Field and Working PrincipleThe UC3864N is a monolithic control device for high performance current mode DC-DC boost applications. It is designed for low voltage applications, for example, battery powered systems, and can deliver up to 1A output current. This IC offers an improved system performance without sacrificing the efficiency and reliability of the regulator.The UC3864N consists of three sections, a current-mode PWM controller, a pulse width modulator (PWM), and a voltage reference. The current mode controller provides cycle-by-cycle peak current limit and adjustable frequency operation from 10kHz to 200kHz. A simple two-wire interface allows the system to be configured and the feedback voltage operating range to be set. The PWM compares the feedback voltage signals with an internally generated triangular waveform and creates pulse width modulated output drive signals. The voltage reference is factory trimmed to 1.25V and provides low temperature drift and output impedance characteristics.The UC3864N features a full range of protection features, including inrush current limit, short-circuit protection, over-temperature protection, and undervoltage lockout. An integrated low-power lowside driver is included to minimize the external components count.The UC3864N voltage regulator is suitable for many applications, including notebook and tablet PCs, digital cameras, video surveillance systems, MP3 players, and USB-powered audio systems. It can also be used in power management systems for mobile phones, gaming consoles, and PDAs.Applications include a constant-current, non-isolated flyback power supply, a power supply with a minimum number of external components, and a boost power supply with MPPT (maximum power point tracking). The UC3864N can be used in close loop applications such as LED drivers. It can also be used in open loop applications such as adjustable output voltage, non-isolated boost power supplies, and simple step down applications.The working principle of the UC3864N is based on the current mode control theory. A voltage across a resistor represents the current signal. When the current signal flows in the opposite direction to its normal flow, it is known as the inverting direction. The magnitude of the current mode signal is represented by the magnitude of the voltage on the resistor.In a current mode control system, the output voltage is determined by the voltage drop across a reference resistor. The reference voltage is compared to the voltage drop across a sense resistor. When the voltage drop across the reference resistor is greater than the voltage drop across the sense resistor, it causes the output voltage to increase. On the other hand, when the voltage drop across the reference resistor is less than the voltage drop across the sense resistor, it causes the output voltage to decrease.The UC3864N has two internal control elements; a voltage reference and an error amplifier. The voltage reference establishes the output voltage through a feedback loop. The error amplifier is used to compare the actual output voltage with the reference voltage and adjust the output voltage accordingly.The UC3864N includes the necessary features to ensure a safe and reliable operation. It includes an undervoltage lockout (UVLO), a thermal shutdown feature, an adjustable Maximum Power Point Tracking (MPPT) feature, an adjustable frequency feature, and an adjustable current limit. The adjustable frequency feature allows the user to optimize the system performance and system efficiency. The adjustable current limit feature helps to protect the system from overcurrent faults.The UC3864N is a high performance DC-DC controller IC designed for use in various low voltage applications. It offers improved system performance without sacrificing the efficiency and reliability of the regulator. It features an integrated low-power lowside driver, adjustable frequency, adjustable current limit, adjustable MPPT, undervoltage lockout, and thermal shutdown features. The UC3864N is suitable for many applications including notebook and tablet PCs, digital cameras, video surveillance systems, MP3 players, and USB-powered audio systems. It can also be used in power management systems for mobile phones, gaming consoles, and PDAs.

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