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- Part Number UC3845DTR
- Manufacturer Texas Instruments
- Pin Count 14
- Part Category Integrated Circuit
- Package Category Small Outline Packages
- Footprint Name Small Outline Packages - D (-R-PDSO-G14)
- Released Date Dec 9, 2021
- Last Modified Date Mar 7, 2023 4:10 PM UTC
- Pinout / Pin List Click Here (Member Only)
UC3845DTR Details
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Manufacturer Part Number:
UC3845DTR
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Brand Name:
Texas Instruments
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Pbfree Code:
Yes
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Rohs Code:
Yes
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Part Life Cycle Code:
Active
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Part Package Code:
SOIC
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Pin Count:
14
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Country Of Origin:
Mexico
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ECCN Code:
EAR99
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HTS Code:
8542.39.00.90
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Manufacturer:
Texas Instruments
UC3845DTR Frequently Asked Questions (FAQs)
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The maximum voltage rating for the UC3845DTR is 30V. However, it's recommended to operate it within 15V to ensure reliable operation and to prevent damage to the internal circuitry.
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The resistor values for the oscillator circuit (Rt and Ct) depend on the desired switching frequency. A good starting point is to use the values recommended in the datasheet (Rt = 10kΩ and Ct = 3.3nF for 250kHz). You can then adjust these values to achieve the desired frequency using the formula: Fs = 1 / (2.86 * Rt * Ct).
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The soft-start pin (SS) is used to gradually increase the output voltage during startup, reducing inrush current and preventing voltage overshoots. To use it, connect a capacitor (typically 10nF to 100nF) from the SS pin to ground, and a resistor (typically 1kΩ to 10kΩ) from the SS pin to the output voltage. This will create a ramp-up time of around 1-10ms.
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To ensure stable operation with a wide input voltage range, it's essential to use a voltage regulator (such as the TLV703) to regulate the supply voltage to the UC3845DTR. This will prevent the internal circuitry from malfunctioning due to voltage variations. Additionally, use a suitable input capacitor to filter out noise and ripple.
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The maximum output current capability of the UC3845DTR is dependent on the specific application and the external components used. However, as a general guideline, the output current should not exceed 1A. If higher output currents are required, consider using an external driver or a more powerful controller.
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UC3845DTR Overview
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.