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593D476X9016D2W Datasheet(PDF) 11 Page - Texas Instruments |
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593D476X9016D2W Datasheet(HTML) 11 Page - Texas Instruments |
11 / 18 page TPS6735 FIXED NEGATIVE 5V 200mA INVERTING DC/DC CONVERTER SLVS141A − JULY 1996 − REVISED JANUARY 1997 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 APPLICATION INFORMATION system typical characteristics (continued) The TPS6735 operates in the voltage-inverting circuit, shown in Figure 15, which can generate a −5-V output. The circuit is ideal for applications that require a negative polarity voltage on the output with respect to the input ground, and for energy management systems. The TPS6735 can be placed in a shutdown mode (1- µA quiescent current) by forcing EN low. soft start The soft-start capacitor provides an orderly start-up of the converter by slowly increasing the switch current limit during power-up. The soft-start timing is controlled by the SS capacitance (see Figure 13 for the capacitance value corresponding to the desired delay time). The switch current limit is proportional to the voltage applied to SS, which is internally pulled to REF by a 1.2-M Ω resistor. SS can be externally pulled lower than REF to limit the switch current. A UVLO condition or an overcurrent condition initiates an SS cycle by discharging the SS capacitor to ground through an internal transistor. A minimum of a 10-nF capacitor must be connected to SS to current limit correctly. inductor selection The standard 10- µH inductor required by the TPS6735 must have a saturation current greater than the peak switch current at the desired maximum load. Operation over the full voltage range and current range is assured by the 10- µH inductor. To determine the required inductor staturation level, refer to the typical operating characteristics graph for peak inductor current versus load current (see Figure 8). Figure 13 40 20 10 0 0.1 0.2 0.3 0.5 0.6 0.7 0.9 50 60 SOFT-START DELAY vs CAPACITANCE 70 1 1.1 1.2 1.4 0.4 0.8 1.3 30 C − Capacitance − µF C6 varied (see Figure 7) VI = 4 V VI = 5 V VI = 6 V Figure 14 0.3 0.1 0 0.6 DRAIN-SOURCE ON-STATE RESISTANCE vs TEMPERATURE 0.7 0.5 0.4 0.2 − 40 − 20 0 20 40 T − Temperature − °C 60 80 100 120 140 VI = 4 V VI = 6 V VI = 5 V |
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