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UC1847L Datasheet(PDF) 11 Page - Texas Instruments |
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UC1847L Datasheet(HTML) 11 Page - Texas Instruments |
11 / 24 page VREF RT CT +E/A -E/A COMP SH-DN GND VIN VC AOUT C/S+ BOUT C/S- CS/SS UCX846 VIN 100µF 2 9 8 5 6 7 16 12 1 3 14 4 11 13 15 .1µ F .005µF .5k 3.2k 3.2k 68k .0015 3.6k 1k 1.5k VREF 2N4150 180Ÿ 2W .05µF 68Ÿ .05µF 68Ÿ 1k 1k 2N4150 .5Q 1N4245 1N4245 1N4245 UES1402 UES1402 200µH 300µF VO UC1846, UC1847, UC2846 UC2847, UC3846, UC3847 www.ti.com SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information The UCx846/7 family of control devices provides all of the necessary features to implement fixed frequency, current mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier to design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters. Protection circuitry includes undervoltage lockout and programmable current limit in addition to soft-start capability. A shutdown function is also available which initiates either a complete shutdown with automatic restart or latch the supply off. 8.2 Typical Application Figure 5. Typical Application Diagram 8.2.1 Design Requirements Table 1 shows the design parameters for this application. Table 1. Design Parameters DESIGN PARAMETER TARGET VALUE Typical efficiency 85% Switching frequency 880 kHz Pulse by pulse current limit threshold 1 A Copyright © 1997–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: UC1846 UC1847 UC2846 UC2847 UC3846 UC3847 |
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