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TPS6734IDRG4 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS6734IDRG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 22 page TPS6734I FIXED 12-V 120-mA BOOST-CONVERTER SUPPLY SLVS127A – AUGUST 1995 – REVISED JANUARY 1999 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION The TPS6734 operates in a boost circuit as shown in Figures 1 and 11. Figure 1 shows the typical application circuit, which generates 12 V from a nominal 5-V source. The circuit is ideal for processor interface for energy management, because EN can be controlled by logic signals to place the 12-V source into the shutdown mode (3- µA current drain) when 12 V is not needed. An example of such an application is a flash memory device that requires 12 V for the erase cycle. discontinuous mode The circuit shown in Figure 1 operates in discontinuous mode over most of the range of input voltage and output current. In discontinuous mode, current through the inductor begins at zero, rises to a peak value, then ramps down to zero each cycle as shown by the voltage and current waveforms in Figure 8. The ringing in the voltage waveform on OUT results from a resonance between the inductor and the power switch capacitance and is normal for discontinuous operation. 0 02 4 6 8 10 5 15 DISCONTINUOUS MODE 20 12 14 16 18 10 1 0.5 0 t – Time – µs VI = 5 V VO = 12 V IL = 50 mA Figure 8 |
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