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TPS79801-Q1 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS79801-Q1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page RETURN OFF -48V FB OUT IN EN TPS79801 GND 1 F m 1 F m R SET ON IN OUT FB GND EN TPS79801 Load V IN R P IN OUT FB GND TPS79801 R 1 V IN V OUT R 2 C 1 V = 1.275 V (1 + R / R ) + I R V = 1.275 V I = 0.2 µA at 25°C Output Range = 1.275 V to 28 V OUT 2 1 FB 2 FB FB EN TPS79801-Q1, TPS79850-Q1 www.ti.com SLVS822D – MARCH 2009 – REVISED AUGUST 2011 APPLICATION INFORMATION The TPS798xx is a 50-mA high-voltage LDO regulator with micropower quiescent current and shutdown. The device is capable of supplying 50 mA at a dropout voltage of 300 mV (typ). The low operating quiescent current (40 μA) drops to 1 μA in shutdown. In addition to the low quiescent current, the TPS798xx incorporates several protection features that make it ideal for battery-powered applications. The device is protected against both reverse-input and reverse-output voltages. In battery-backup applications, where the output can be held up by a backup battery when the input is pulled to ground, the TPS798xx acts as if it has a diode in series with its output and prevents reverse current flow. Figure 16 and Figure 17 illustrate two typical applications. Note: ILED = 1.275 V/RSET –48 V can vary from –4 V to –50 V Figure 16. Constant Brightness for Indicator LED Over Wide Input Voltage Range Figure 17. Kelvin Sense Connection Adjustable Operation The TPS798xx has an output voltage range of 1.275 V to 28 V. The output voltage is set by the ratio of two external resistors as shown in Figure 18. The feedback loop monitors the output to maintain the voltage at the adjust pin at 1.275 V referenced to ground. The current in R1 is then equal to 1.275 V/R1, and the current in R2 is the current in R1 plus the FB pin bias current. The FB pin bias current, 0.2 μA at 25°C, flows through R2 into the FB pin. The output voltage can be calculated using the formula in Figure 18. The value of R1 should be less than 250 k Ω to minimize errors in the output voltage caused by the FB pin bias current. Note that in shutdown, the output is turned off and the divider current is zero. Figure 18. Adjustable Operation Copyright © 2009–2011, Texas Instruments Incorporated 11 |
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