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TPS68625 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS68625 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 17 page  www.ti.com Programming the TPS78601 Adjustable LDO C1 + (3 x 10–7) x (R1 ) R2) (R1 x R2) (3) V O + V ref 1 ) R1 R2 (1) Regulator Protection R1 + V O V ref * 1 R2 (2) OUTPUT VOLTAGE PROGRAMMING GUIDE OUTPUT VOLTAGE R1 R2 C1 GND NR FB IN OUT EN V IN V OUT R1 C1 R2 0.01 µF TPS78601 1 µF 1.8 V 3.6V 14.0 k Ω 57.9 k Ω 30.1 k Ω 30.1 k Ω 33 pF 15 pF 2.2 µF TPS78601, TPS78618 TPS78625, TPS78628 TPS78630, TPS78633 SLVS389D – SEPTEMBER 2002 – REVISED OCTOBER 2004 Regulator The output voltage of the TPS78601 adjustable The suggested value of this capacitor for several regulator is programmed using an external resistor resistor ratios is shown in the table below. If this divider as shown in Figure 25. The output voltage is capacitor is not used (such as in a unity-gain con- calculated using Equation 1: figuration), then the minimum recommended output capacitor is 2.2 µF instead of 1 µF. where: The TPS786xx PMOS-pass transistor has a built-in • VREF = 1.2246 V typ (the internal reference back diode that conducts reverse current when the voltage) input voltage drops below the output voltage (e.g., Resistors R1 and R2 should be chosen for approxi- during power down). Current is conducted from the mately 40-µA divider current. Lower value resistors output to the input and is not internally limited. If can be used for improved noise performance, but the extended reverse voltage operation is anticipated, device wastes more power. Higher values should be external limiting might be appropriate. avoided, as leakage current at FB increases the The TPS786xx features internal current limiting and output voltage error. The recommended design pro- thermal protection. During normal operation, the cedure is to choose R2 = 30.1 k Ω to set the divider TPS786xx limits output current to approximately 2.8 current at 40 µA, C1 = 15 pF for stability, and then A. When current limiting engages, the output voltage calculate R1 using Equation 2: 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 approxi- In order to improve the stability of the adjustable mately 165 °C, thermal-protection circuitry shuts it version, it is suggested that a small compensation down. Once the device has cooled down to below capacitor be placed between OUT and FB. The approximately 140 °C, regulator operation resumes. approximate value of this capacitor can be calculated using Equation 3: Figure 25. TPS78601 Adjustable LDO Regulator Programming 10 |
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Similar Description - TPS68625 |
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