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TPS61000 Datasheet(PDF) 16 Page - Texas Instruments

Part # TPS61000
Description  Single- and Dual-Cell Boost Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61000 Datasheet(HTML) 16 Page - Texas Instruments

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TPS61000, TPS61001, TPS61002, TPS61003
TPS61004, TPS61005, TPS61006, TPS61007
SLVS279D – MARCH 2000 – REVISED AUGUST 2015
www.ti.com
10.2.2.2 Programming the Low Battery Comparator Threshold Voltage
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. The voltage across R2 is equal to the reference voltage that is
generated on-chip, which has a value of 500 mV ±15 mV. The recommended value for R2 is therefore in the
range of 500 k
Ω. From that, the value of resistor R1, depending on the desired minimum battery voltage (VBAT),
can be calculated using the following equation:
(2)
For example, if the low-battery detection circuit should flag an error condition on the LBO output pin at a battery
voltage of 1 V, a resistor in the range of 500 k
Ω should be chosen for R1.
The output of the low battery comparator is a simple open-drain output that goes active low if the battery voltage
drops below the programmed threshold voltage on LBI. The output requires a pullup resistor with a
recommended value of 1M
Ω, and should only be pulled up to the VOUT. If not used, the LBO pin can be left
floating.
10.2.2.3 Inductor Selection
The output filter of inductive switching regulators is a low pass filter of second order. It consists of an inductor
and a capacitor, often referred to as storage inductor and output capacitor.
To select an inductor, keep the possible peak inductor current below the current limit threshold of the power
switch in your chosen configuration. For example, the current limit threshold of the TPS61006’s switch is 1100
mA at an output voltage of 3.3 V. The highest peak current through the inductor and the switch depends on the
output load, the input (VBAT), and the output voltage (VOUT). Estimation of the maximum average inductor current
can be done using the following equation:
(3)
For example, for an output current of 100 mA at 3.3 V, at least 515-mA current flows through the inductor at a
minimum input voltage of 0.8 V.
The second parameter for choosing the inductor is the desired current ripple in the inductor. Normally it is
advisable to work with a ripple of less than 20% of the average inductor current. A smaller ripple reduces the
magnetic hysteresis losses in the inductor as well as output voltage ripple and EMI. But in the same way, the
regulation time at load change rises. In addition, a larger inductor increases the total system cost.
With those parameters it is possible to calculate the value for the inductor:
where
f is the switching frequency
ΔIL is the ripple current in the inductor, that is 20% x IL
(4)
In this example, the desired inductor has the value of 12 µH. With this calculated value and the calculated
currents, it is possible to chose a suitable inductor. Care has to be taken that load transients and losses in the
circuit can lead to higher currents as estimated in equation 3. Also, the losses in the inductor caused by magnetic
hysteresis losses and copper losses are a major parameter for total circuit efficiency.
The following inductors from different suppliers were tested. All work with the TPS6100x converter within their
specified parameters:
Table 3. Recommended Inductors
VENDOR
PART NUMBER
DO1608P Series
Coilcraft
DS1608P Series
DO3308 Series
16
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Copyright © 2000–2015, Texas Instruments Incorporated
Product Folder Links: TPS61000 TPS61001 TPS61002 TPS61003 TPS61004 TPS61005 TPS61006 TPS61007


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