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TPS40003DGQR датащи(PDF) 8 Page - Texas Instruments |
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TPS40003DGQR датащи(HTML) 8 Page - Texas Instruments |
8 / 28 page TPS40000, TPS40001 TPS40002, TPS40003 TPS40004, TPS40005 SLUS507D − JANUARY 2002 − REVISED NOVEMBER 2005 8 www.ti.com APPLICATION INFORMATION The TPS4000x series of synchronous buck controller devices is optimized for high-efficiency dc-to-dc conversion in non-isolated distributed power systems. A typical application circuit is shown in Figure 1. The TPS40004 and TPS40005 are the controllers of choice for most general purpose synchronous buck designs. Each operates in two quadrant mode (i.e. source or sink current) full time. This choice provides the best performance for output voltage load transient response over the widest load current range. The TPS40001 and TPS40003 add an additional feature: They operate in single quadrant mode (i.e. source current only) during converter startup, and then when the converter has reached the regulation point, the controllers change to operate in two quadrant mode. This is useful for applications that have outputs pre-biased at some voltage before the controller is enabled. When the TPS40001 or TPS40003 is enabled, it does not sink current during startup and therefore does not pull current from the pre-biased voltage supply. The TPS40000 and TPS40002 operate in single quadrant mode (source current only) full time, allowing the paralleling of converters. Single quadrant operation ensures one converter does pull current from a paralleled converter. A converter using one of these controllers emulates a non-synchronous buck converter at light loads. When current in the output inductor attempts to reverse, an internal zero-current detection circuit turns OFF the synchronous rectifier and causes the current flow in the inductor to become discontinuous. At average load currents greater than the peak amplitude of the inductor ripple current, the converter returns to operation as a synchronous buck converter to maximize efficiency. UDG−02013 10 µF 20 k W 100 µF 7.68 k Ω 470 µF 10 µF 15.7 kΩ 243 Ω 10 k Ω VOUT 1.8 V 10 A 1.0 µH Si4836DY IHLP5050CE−01 Si4836DY 5 8 7 10 9 1 2 3 ILIM FB COMP GND HDRV SW VDD LDRV 3.6 nF 4 4.7 nF SS/SD 6 BOOT 100 pF TPS40001 100 nF 3.3 nF 3.3 Ω VDD 3.0 V to 5.5 V Figure 1. Typical Application Circuit |
Аналогичный номер детали - TPS40003DGQR |
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Аналогичное описание - TPS40003DGQR |
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