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TPS62095 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS62095 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 27 page Voltage t V1 = 3.3V V2 = 1.8V Voltage t V1 = 3.3V V2 = 1.8V a) V1 startup leading V2 b) Simultaneous tracking ÷ ø ö ç è æ + ´ < ÷ ø ö ç è æ + 1 4 R 3 R 56 . 1 1 2 R 1 R ÷ ø ö ç è æ + ´ = ÷ ø ö ç è æ + 1 4 R 3 R 56 . 1 1 2 R 1 R 2 R 2 R 1 R 4 R 3 R 4 R 56 . 1 1 1 V 2 V + ´ + ´ = R4 R3 V1 Output of external DC DC converter V2 1.8V/4A V IN 2.5V to 5.5V PVIN PVIN EN FB C1 22µF L1 1µH C2 2 x 22µF R1 200k SW TPS62095 SW AVIN R2 160k SS AGND PG VOS DEF CP CN C3 10nF 1 2 13 4 5 6 PGND PGND 7 8 9 10 11 12 3 14 15 16 TPS62095 www.ti.com SLVSBD8A – APRIL 2014 – REVISED MAY 2014 Device Functional Modes (continued) During startup the switch current limit is reduced to 1/3 of its typical current limit of 5.5A when the output voltage is less than 0.6V. Once the output voltage exceeds typically 0.6V, the switch current limit is released to its nominal value. Thus, the device provides a reduced load current of 1.8A when the output voltage is below 0.6V. A small or no soft startup time may trigger this reduced switch current limit during startup, especially for larger output capacitor applications. This is avoided by using a larger soft start up capacitance which extends the soft startup time. See Short Circuit Protection (Hiccup-Mode) for details of the reduced current limit during startup. 7.4.2 Voltage Tracking The SS pin can also be used to implement output voltage tracking with other supply rails, as shown in Figure 5. Figure 5. Output Voltage Tracking In voltage tracking applications, the resistance R4 should be set properly to achieve accurate voltage tracking by taking 7.5 μA soft startup current into account. 4.3kΩ is a sufficient value for R4. The relationship between V1 and V2 is shown in Equation 5. To achieve V1 startup leading V2, as shown in Figure 6, Equation 5 should be less than 1. To achieve simultaneous tracking, Equation 5 should equal to 1. (5) Figure 6. Voltage Tracking Applications Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS62095 |
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