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TPS72101DBVTG4 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS72101DBVTG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 14 page TPS72101, TPS72115 TPS72116, TPS72118 SLVS352B – DECEMBER 2001 – REVISED MAY 2002 www.ti.com 9 PROGRAMMING THE TPS72101 ADJUSTABLE LDO REGULATOR The output voltage of the TPS72101 adjustable regulator is programmed using an external resistor divider as shown in Figure 18. The output voltage is calculated using: V O + V ref 1 ) R1 R2 (1) Where: Vref = 1.225 V typ (the internal reference voltage) Resistors R1 and R2 should be chosen for approximately 10- µA divider current. Lower value resistors can be used but offer no inherent advantage and waste more power. Higher values should be avoided, as leakage currents at FB increase the output voltage error. The recommended design procedure is to choose R2 = 121 k Ω to set the divider current at 10 µA and then calculate R1 using: R1 + V O V ref * 1 R2 (2) Where: Vref = 1.225 V VO VI OUT FB R2 GND EN IN ≤0.9 V ≥1.7 V TPS72101 OUTPUT VOLTAGE (V) R1 R2 2.5 3.3 127 205 121 121 OUTPUT VOLTAGE PROGRAMMING GUIDE DIVIDER RESISTANCE (k Ω)† † 1% values shown. 3 1 4 2 R1 5 0.1 µF 0.1 µF Figure 18. TPS72101 Adjustable LDO Regulator Programming REGULATOR PROTECTION The TPS721xx pass element has a built-in back diode that safely conducts reverse current when the input voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage is anticipated, external limiting might be appropriate. The TPS721xx also features internal current limiting and thermal protection. During normal operation, the TPS721xx limits output current to approximately 350 mA. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package. If the temperature of the device exceeds 170 °C, thermal-protection circuitry shuts it down. Once the device has cooled down to below 150 °C, regulator operation resumes. |
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