UC3845ADTR

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Introduction

UC3845ADTR is a DC/DC switching controller specifically designed for low voltage/high voltage applications. It implements an internal oscillator and a regulating circuit, which give the device the capability to detect, control and regulate output voltage. In addition, the device also offers various protections and failure modes to minimize the effects of any fault conditions. UC3845ADTR is commonly used in various applications such as Battery Chargers, Motor Drives, DC to DC converters, Buck converters and Mobile Appliances.

Device Overview

The UC3845ADTR is a high-performance DC/DC step-down switching controller intended for converting an input voltage from 10V to 35V into a regulated output voltage that is adjustable between 0.5V and 35V. It is a P-channel MOSFET type converter that features an advanced control architecture for optimal efficiency and regulation. The device also features a dynamic input power scaling feature, which allows for higher input forward voltage operation.

Pin Description

UC3845ADTR offers 22 pins at an SOIC-20 package. The pin layout consists of:

• VCC- Power supply pin, connect supply voltage up to 35V
• GND- Ground pin, leave open to connect to ground
• REF- Reference voltage pin, connect to reference voltage
• COME- Compensation pin, connect to compensation pin
• FB- Feedback pin, connect to feedback pin
• CS- Current sense pin, connect to load current sense
• ENA- Enable pin, connect to logic high to enable
• TTL1- Logic pin, connect to logic signal for high frequency oscillator
• TTL2- Logic pin, connect to logic signal for low frequency oscillator
• THI- Thermal pin, connect to thermal pin
• CLI- Clock input pin, connect to clock signal
• LOAD- Load control pin, connect to load control signal
• INH- Inhibit pin, connect to logic high to inhibit output
• FET- MOSFET driver pin, connect to gate of P-channel MOSFET
• VCC- Power supply pin, connect to ground via cable

Operation Modes

The UC3845ADTR has three operating modes, which are positive mode, fixed frequency and current mode. In positive mode, power is applied to the reference voltage pin to drive the duty cycle to its maximum. This in turn increases the output voltage. The Fixed Frequency mode allows for pulse width modulation using a constant frequency. Lastly, Current Mode operation is used when higher efficiency is required. This mode uses current sensing to regulate the output voltage.

Features and Benefits

The UC3845ADTR comes with a lot of features and benefits. These include:

• Improved efficiency
• Low quiescent current
• Wide operating supply range of up to 35V
• Very low output voltage switching ripple
• Soft-start
• Integrated P-channel MOSFET gate drive circuit
• External clock synchronization
• Dynamic Input Power Scaling
• Thermal protection
• Programmable over-current protection
• High switching frequency and current capability
• Wide temperature range of -40°C to +150°C.

Applications

UC3845ADTR has been widely used in a variety of applications due to its combination of excellent power efficiency and robustness. Some of the common uses include mobile phone charging and switching DC to DC converter applications. In addition, the device can be used in telecommunication and power systems, buck converters, motor drives, and other embedded and industrial applications.

Conclusion

The UC3845ADTR is a high-performance DC/DC step-down switching controller intended for converting an input voltage from 10V to 35V into a regulated output voltage that is adjustable between 0.5V and 35V. It features an advanced control architecture for optimal power efficiency and regulation. The device also has a wide range of features and benefits, making it suitable for applications such as Battery Chargers, Motor Drives, DC to DC converters, Buck converters, and Mobile Appliances.

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