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TPS60110 Fiches technique(PDF) 6 Page - Texas Instruments |
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TPS60110 Fiches technique(HTML) 6 Page - Texas Instruments |
6 / 29 page TPS60130, TPS60131, TPS60132, TPS60133 REGULATED 5V, 300 mA HIGH EFFICIENCY CHARGE PUMP DC/DC CONVERTERS SLVS258A − NOVEMBER 1999 − REVISED DECEMBER 1999 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 low-battery detector (TPS60130 and TPS60132) (continued) LBO is an open drain output. An external pullup resistor to OUT, in the 100-k Ω to 1-MΩ range is recommended. During start-up, the LBO output signal is invalid for the first 500 µs. LBO is high impedance when the device is disabled. If the low-battery comparator function is not used, connect LBI to ground and leave LBO unconnected. _ + + − VREF VBAT IN R1 LBI R2 LBO V TRIP + 1.21 V 1 ) R1 R2 VOUT R3 Figure 1. Programming of the Low-Battery Comparator Trip Voltage Formulas to calculate the resistive divider for low battery detection, with VLBI = 1.15 V − 1.27 V: R2 + 1MW V LBI V BAT R1 + 1MW * R2 Formulas to calculate the minimum and maximum battery voltage that triggers the low battery detector: V BAT(min) + V LBI(min) R1 (min) ) R2 (max) R2 (max) V BAT(max) + V LBI(max) R1 (max) ) R2 (min) R2 (min) Table 1. Recommended Values for the Resistive Divider from the E96 Series ( ±1%), VLBI = 1.15 V − 1.27 V VBAT/V R1/kΩ R2/kΩ VBAT(MIN)/V VBAT(MAX)/V 2.7 562 453 2.548 −5.61% 2.877 6.57% 2.8 576 442 2.619 −6.47% 2.958 5.66% 2.9 590 422 2.726 −6.00% 3.081 6.26% 3.0 590 402 2.804 −6.53% 3.172 5.72% 3.1 604 383 2.928 −5.56% 3.313 6.88% 3.2 619 374 3.016 −5.76% 3.414 6.70% 3.3 649 374 3.106 −5.88% 3.518 6.62% A 100 nF bypass capacitor should be connected in parallel to R2 if large line transients are expected. These voltage drops can inadvertently trigger the low-battery comparator and produce a wrong low-battery warning signal at the LBO pin. |
Numéro de pièce similaire - TPS60110 |
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Description similaire - TPS60110 |
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