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參數(shù)資料
| 型號(hào)： | TPS61071DDCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.7 A BATTERY CHARGE CONTROLLER, 1440 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | PLASTIC, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 6/23頁 |
| 文件大小： | 653K |
| 代理商： | TPS61071DDCT |
APPLICATION INFORMATION
DESIGN PROCEDURE
Programming the Output Voltage
R1 + R2
V
O
V
FB
* 1 + 180 kW
V
O
500 mV *
1
(1)
C
parR1 +
3 pF
200 kW
R2
* 1
(2)
SW
C1
Power
Supply
L1
VBAT
VOUT
FB
C2
EN
GND
TPS61070
VCC
BoostOutput
R1
R2
Inductor Selection
I
L +
I
O
VOUT
VBAT
0.8
(3)
SLVS510C – JULY 2006 – REVISED MARCH 2009 .......................................................................................................................................................... www.ti.com
The TPS6107x dc/dc converters are intended for systems powered by a single-cell, up to triple-cell alkaline,
NiCd, NiMH battery with a typical terminal voltage between 0.9 V and 5.5 V. They can also be used in systems
powered by one-cell Li-ion or Li-polymer with a typical voltage between 2.5 V and 4.2 V. Additionally, any other
voltage source with a typical output voltage between 0.9 V and 5.5 V can power systems where the TPS6107x is
used. Due to the nature of boost converters, the output voltage regulation is only maintained when the input
voltage applied is lower than the programmed output voltage.
The output voltage of the TPS6107x dc/dc converter can be adjusted with an external resistor divider. The typical
value of the voltage at the FB pin is 500 mV. The maximum recommended 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 A, and the voltage across R2 is typically 500 mV. Based on those two
values, the recommended value for R2 should be lower than 500 k
, in order to set the divider current at 1 A or
higher. Because of internal compensation circuitry, the value for this resistor should be in the range of 200 k
.
From that, the value of resistor R1, depending on the needed output voltage (VO), is calculated using Equation 1:
For example, if an output voltage of 3.3 V is needed, a 1 M
resistor should be chosen for R1. If for any reason
the value chosen for R2 is significantly lower than 200 k
Ω, additional capacitance in parallel to R1 is
recommended, if the device shows instable regulation of the output voltage. The required capacitance value is
calculated using Equation 2:
Figure 23. Typical Application Circuit for Adjustable Output Voltage Option
A boost converter normally requires two main passive components for storing energy during the conversion. A
boost inductor and a storage capacitor at the output are required. To select the boost inductor, it is
recommended to keep the possible peak inductor current below the current limit threshold of the power switch in
the chosen configuration. For example, the current limit threshold of the TPS6107x's switch is 600 mA. The
highest peak current through the inductor and the switch depends on the output load, the input (VBAT), and the
For example, for an output current of 75 mA at 3.3 V, at least 340 mA of average current flows through the
inductor at a minimum input voltage of 0.9 V.
14
Copyright 2006–2009, Texas Instruments Incorporated
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