UC3845AM

Frequency - Switching:	500kHz
Base Part Number:	UC*84
Supplier Device Package:	8-DIP
Package / Case:	--
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	--
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	48%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck, Boost
Output Configuration:	Positive
Function:	Step-Up, Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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UC3845AM is a kind of high performance power integrated circuit, which consists of a voltage regulator and a DC/DC switching controller. It is especially suitable for high efficiency DC/DC switching power supply design. It can be used in a wide range of applications, such as computer peripheral equipment, industrial equipment, home appliance, communication device, automotive and mobile equipment, etc. Working PrincipleUC3845AM is a high speed current mode PWM controller that uses a precision fixed frequency oscillator with an internal slope compensation circuit. The internal PWM comparator is used to compare the output of an error amplifier with a triangular wave generated by the oscillator to generate a signal that is used to regulate the output frequency. The duty cycle of the pulse signal is used to control the output voltage of the converter.The UC3845AM internal closed loop function provides temperature compensation for voltage and current limit level, protection against over-current and over-voltage, as well as soft start. A wide range of reference voltages are available for different output voltage applications. In addition, an adjustable hysteresis band is available to reduce output voltage ripple.Application FieldUC3845AM is suitable for use in step-up (boost), step-down (buck) as well as inverting applications. It is suitable for high-efficiency DC-DC switching power supply design, especially in compact, light-weight applications. It is also suitable for low-cost, low-noise systems, such as notebook computers, uninterruptible power systems, DC power systems, motor control systems, automotive applications, and mobile communications.The wide input voltage range of UC3845AM makes it suitable for many applications, such as microprocessors, LCD displays and other peripherals, as well as battery powered applications. A wide range of reference voltages are available to meet different output voltage requirements, such as 12V or button-cell batteries. The high current capability of the device and the large hysteresis band allows for the design of cost-effective, low-ripple DC-DC converters and switching regulators.ConclusionUC3845AM is a high-performance power integrated circuit that consists of a voltage regulator and a DC/DC switching controller. Its internal closed loop function provides temperature compensation for voltage and current limit level, protection against over-current and over-voltage, as well as soft start. A wide range of applications, such as computer peripheral equipment, industrial equipment, home appliance, communication device, automotive and mobile equipment, etc., can be supported because of its wide input voltage range, current capability, and adjustable hysteresis band.

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