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TPS75815KTTR データシート(PDF) 11 Page - Texas Instruments |
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TPS75815KTTR データシート(HTML) 11 Page - Texas Instruments |
11 / 26 page www.ti.com VO VI OUT FB R1 R2 GND EN IN ≤ 0.7 V ≥ 2 V TPS75801 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 Regulator Protection Input Capacitor Output Capacitor TPS75801 ,, TPS758A01 TPS75815, TPS75818 TPS75825, TPS75833 SLVS330F – JUNE 2001 – REVISED APRIL 2007 APPLICATION INFORMATION (continued) Figure 20. TPS75801 Adjustable LDO Regulator Programming The TPS758xx PMOS-pass transistor has a built-in back diode that conducts reverse currents when the input voltage drops below the output voltage (for example, 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 TPS758xx also features internal current limiting and thermal protection. During normal operation, the TPS758xx limits output current to approximately 10A. 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. For a typical application, a ceramic input bypass capacitor (0.22 µF to 1µF) is recommended to ensure device stability. This capacitor should be as close as possible to the input pin. Due to the impedance of the input supply, large transient currents will cause the input voltage to droop. If this droop causes the input voltage to drop below the UVLO threshold, the device will turn off. Therefore, it is recommended that a larger capacitor be placed in parallel with the ceramic bypass capacitor at the regulator input. The size of this capacitor depends on the output current, response time of the main power supply, and the distance of the main power supply to the regulator. At a minimum, the capacitor should be sized to ensure that the input voltage does not drop below the minimum UVLO threshold voltage during normal operating conditions. As with most LDO regulators, the TPS758xx requires an output capacitor connected between OUT and GND to stabilize the internal control loop. The minimum recommended capacitance value is 47 µF with an ESR (equivalent series resistance) of at least 200m Ω. As shown in Figure 21, most capacitor and ESR combinations with a product of 47–6 x 0.2 = 9.4–6 or larger will be stable, provided the capacitor value is at least 47 µF. Solid tantalum electrolytic and aluminum electrolytic capacitors are all suitable, provided they meet the requirements described in this section. Larger capacitors provide a wider range of stability and better load transient response. This information and the ESR graphs shown in Figure 18, Figure 19, and Figure 21, is included to assist in selection of suitable capacitance for the user's application. When necessary to achieve low height requirements with high output current and/or high load capacitance, several higher ESR capacitors can be used in parallel to meet these guidelines. 11 Submit Documentation Feedback |
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