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TPS75515KC Datasheet(PDF) 19 Page - Texas Instruments |
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TPS75515KC Datasheet(HTML) 19 Page - Texas Instruments |
19 / 29 page TPS75515, TPS75518, TPS75525, TPS75533 WITH POWER GOOD AND TPS75501 FAST TRANSIENT RESPONSE 5A LOW DROPOUT VOLTAGE REGULATORS SLVS293D − NOVEMBER 2000 − REVISED MAY 2002 19 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION programming the TPS75501 adjustable LDO regulator The output voltage of the TPS75501 adjustable regulator is programmed using an external resistor divider as shown in Figure 28. The output voltage is calculated using: V O + V ref 1 ) R1 R2 (9) Where: Vref = 1.224 V typ (the internal reference voltage) Resistors R1 and R2 should be chosen for approximately 40- 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 = 30.1 k Ω to set the divider current at 40 µA and then calculate R1 using: R1 + V O V ref * 1 R2 (10) VO VI OUT FB R1 R2 GND EN IN ≤ 0.7 V ≥ 2 V TPS75501 1 µF Co OUTPUT VOLTAGE PROGRAMMING GUIDE OUTPUT VOLTAGE R1 R2 2.5 V 3.3 V 3.6 V UNIT 31.6 51 58.3 30.1 30.1 30.1 k Ω k Ω k Ω Figure 28. TPS75501 Adjustable LDO Regulator Programming regulator protection The TPS755xx PMOS-pass transistor has a built-in back diode that conducts reverse currents 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. When extended reverse voltage is anticipated, external limiting may be appropriate. The TPS755xx also features internal current limiting and thermal protection. During normal operation, the TPS755xx limits output current to approximately 10 A. 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 150 °C(typ), thermal-protection circuitry shuts it down. Once the device has cooled below 130 °C(typ), regulator operation resumes. |
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