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TPS61092RSAR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS61092RSAR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page www.ti.com APPLICATION INFORMATION DESIGN PROCEDURE Programming the Output Voltage R3 + R4 V O V FB * 1 + 200 kW V O 500 mV * 1 (1) C parR3 + 10 pF 200 kW R4 –1 (2) SW C1 Power Supply L1 R1 R2 VBAT VOUT FB C2 C3 LBO PGND LBI SYNC EN GND TPS6109x VOUT Boost Output Low Battery Output R3 R4 R5 Programming the LBI/LBO Threshold Voltage TPS61090 TPS61091, TPS61092 SLVS484A – JUNE 2003 – REVISED APRIL 2004 The TPS6109x dc/dc converters are intended for systems powered by a dual or triple cell NiCd or NiMH battery with a typical terminal voltage between 1.8 V and 5.5 V. They can also be used in systems powered by one-cell Li-Ion with a typical stack voltage between 2.5 V and 4.2 V. Additionally, two or three primary and secondary alkaline battery cells can be the power source in systems where the TPS6109x is used. The output voltage of the TPS61090 dc/dc converter section can be adjusted with an external resistor divider. The typical value of the voltage on the FB pin is 500 mV. The maximum allowed value for the output voltage is 5.5 V. The current through the resistive divider should be about 100 times greater than the current into the FB pin. The typical current into the FB pin is 0.01 µA, and the voltage across R4 is typically 500 mV. Based on those two values, the recommended value for R4 should be lower than 500 k Ω, in order to set the divider current at 1 µA or higher. Because of internal compensation circuitry the value for this resistor should be in the range of 200 k Ω. From that, the value of resistor R3, depending on the needed output voltage (V O), can be calculated using Equation 1: If as an example, an output voltage of 5.0 V is needed, a 1.8-M Ω resistor should be chosen for R3. If for any reason the value for R4 is chosen significantly lower than 200 k Ω additional capacitance in parallel to R3 is recommended. The required capacitance value can be easily calculated using Equation 2 Figure 18. Typical Application Circuit for Adjustable Output Voltage Option The current through the resistive divider should be about 100 times greater than the current into the LBI pin. The typical current into the LBI pin is 0.01 µA, and the voltage across R2 is equal to the LBI voltage threshold that is generated on-chip, which has a value of 500 mV. The recommended value for R2is therefore in the range of 500 k Ω. From that, the value of resistor R1, depending on the desired minimum battery voltage V BAT, can be calculated using Equation 3. 11 |
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