HomedatasheetUC3845NG

UC3845NG Datasheet

PMIC - Voltage Regulators - DC DC Switching Controllers
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Description

The UC3844, UC3845NG series are high performance fixed frequency current mode controllers. They are specifically designed for Off−Line and DC−to−DC converter applications offering the designer a cost effective solution with minimal external components. These integrated circuits feature an oscillator, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle−by−cycle current limiting, a latch for single pulse metering, and a flip−flop which blanks the output off every other oscillator cycle, allowing output dead times to be programmed for 50% to 70%.These devices are available in an 8−pin dual−in−line plastic package as well as the 14−pin plastic surface mount (SOIC−14). The SOIC−14 package has separate power and ground pins for the totem pole output stage.The UCX844 has UVLO thresholds of 16 V (on) and 10 V (off),ideally suited for off−line converters. The UC3845NG is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off). UC3845NG Features • Current Mode Operation to 500 kHz Output Switching Frequency• Output Deadtime Adjustable from 50% to 70%• Automatic Feed Forward Compensation• Latching PWM for Cycle−By−Cycle Current Limiting• Internally Trimmed Reference with Undervoltage Lockout• High Current Totem Pole Output• Input Undervoltage Lockout with Hysteresis• Low Startup and Operating Current• Direct Interface with ON Semiconductor SENSEFET Products• Pb−Free Packages are Available
Features

Parameters

[{"Name":"Number of Outputs ","Value":"1"},{"Name":"Frequency - Max ","Value":"60kHz"},{"Name":"Duty Cycle ","Value":"50%"},{"Name":"Voltage - Supply ","Value":"7.6 V ~ 30 V "},{"Name":"Operating Temperature ","Value":"0°C ~ 70°C "},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""}]

Manufacturer information

SEIKO INSTRUMENTS

Seiko Instruments Inc. Is a Japanese company which head office is located in 8, Nakase 1-chome, Mihama-ku, Chiba-shi, Chiba 261-8507, Japan . It’s business lines are: Watches Business Watches, Watch Movements Electronic Components Business Quartz crystals, Micro batteries, etc. Precision Mechatronics Business Inkjet printer heads, Hard disk components, Thermal printers, Compact precision components, Machine tools, FA, Musical instrument accessories, Radiation detection and measurement systems, etc.


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