UC3842DTR

Frequency - Switching:	Up to 500kHz
Base Part Number:	UC3842
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	97%
Series:	--
Voltage - Supply (Vcc/Vdd):	10 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Buck, Buck-Boost, Flyback, Forward
Output Configuration:	Positive
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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1. Introduction The UC3842DTR is a low-cost, high-performance DC/DC switching controller which allows for efficient regulation of switching voltage regulators without compromising overall system reliability. It is particularly suited for design stack-up, cost, and performance optimization for applications requiring high-power conversion. This integrated switching circuit offers adjustable ON time (ton), adjustable OFF time (toff), adjustable dead time (tdead) and current limit feedback. This combined with the excellent transient performance provides superior system efficiency and stability. 2. Application Fields The UC3842DTR has a wide range of applications. It is commonly used for DC/DC converters, power distribution and voltage regulation in automotive, industrial, and consumer electronics applications. In particular, it is used in non-isolated switching DC/DC converters, such as Buck, Buck-Boost, Flyback, and Flyback Isolated. It is also used in low- and medium-power systems in difficult environmental conditions such as automotive and aerospace applications. 3. Working Principle At the heart of the UC3842DTR is a dual-slope control. The circuit has two comparators and one timer. The first comparator is used to detect the output voltage, while the second is used to detect the current limit. The timer is used to set the on-time of the switch and the off-time of the regulator. The output voltage and current limit are compared to the reference voltage. If the output voltage is lower than the reference voltage, the switch is turned on and the current limit is kept in check by the second comparator. When the current limit is reached, the switch is turned off and the output voltage is regulated. 4. Benefits The UC3842DTR offers several features for design optimization. It can provide better performance and improve efficiency by reducing the number of components required when compared to conventional comparator-based designs. Furthermore, the dual-slope control offers excellent transient performance while providing excellent noise immunity. The on-chip timer allows for easy design optimization and any necessary fault protection. The device also reduces system cost and complexity by eliminating the need for additional components, as the regulator and gate drive are integrated into a single package. 5. Conclusion The UC3842DTR is a versatile and economical DC/DC switching controller suitable for a wide range of applications. It features excellent transient response and adjustable dead time and current limiting. Additionally, its on-chip timer allows for easy design optimization. The combination of these features makes the UC3842DTR an excellent choice for efficient and reliable power supply design.

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