UC3845BVD

Frequency - Switching:	500kHz
Base Part Number:	UC384*B
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 105°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	48%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback
Output Configuration:	Positive or Negative, Isolation Capable
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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UC3845BVD Application Field and Working PrincipleThe UC3845BVD is an advanced, high-performance voltage regulator in the pulse width modulation (PWM) family of integrated circuit (IC) controllers. As a PMIC (Power Management IC) it is categorized as a DC DC Switching Controller. This versatile, low-cost IC is used in a wide range of applications and offers many advantages like efficient regulation, high reliability and accuracy of control, and excellent thermal stability.The IC is designed to provide a regulated output voltage over a wide operating temperature range and provides low ripple voltage that is suitable for low noise applications. It also provides integrated over-voltage, under-voltage, and over-current protection and can be used to easily configure different levels of output currents and power levels.The UC3845BVD is a digitally programmable controller that allows users to customize their system while providing reliable protection features to maintain current and voltage levels. This versatile IC can be used in a variety of applications, from small self contained linear regulators to digital first-order and second-order PID controllers. When used in a system, the IC offers many advantages, such as cost savings, low ripple and noise, low operating temperatures, and high accuracy.The IC works by feedback control and modulating the pulse width of the PWM signal, and uses a hysteretic comparator to compare the output voltage and target voltage. If the output voltage is lower than the target voltage, the comparator feeds back a HIGH logic level and the PWM input signal is modulated accordingly. When the output voltage is higher than the target voltage, the logic level is LOW and the PWM is suppressed. This control loop is repeated until the output voltage reaches the desired value, at which point the PWM is modulated to maintain the set voltage.For high reliability and robust operation in many power applications, the UC3845BVD is the perfect choice. It offers many features to improve system performance, while requiring minimal external components. The low cost of the IC helps keep the system’s overall cost low and the wide operating temperature helps ensure reliable operation in harsh environments. It is an ideal choice for applications requiring tight voltage regulation, such as DC-DC converters, battery chargers, and power supply designs.

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