參數(shù)資料
型號： TPS61032RSA
廠商： Texas Instruments, Inc.
英文描述： 96% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 4A SWITCH
中文描述： 96％高效同步升壓轉(zhuǎn)換器和4A條開關(guān)
文件頁數(shù)： 13/20頁
文件大小： 375K
代理商： TPS61032RSA
www.ti.com
APPLICATION INFORMATION
Design Procedure
The TPS6103x 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 TPS6103x is used.
Programming the Output Voltage
R3
R4
VO
VFB
1
180 k
VO
500 mV
1
(1)
CparR3
10 pF
200 k
R4
–1
(2)
SW
C1
Power
Supply
L1
R1
R2
VBAT
VOUT
FB
C2
C3
LBO
PGND
LBI
SYNC
EN
GND
TPS6103x
V
CC
Boost Output
Control Output
R3
R4
R6
Programming the LBI/LBO 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, 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 R2 is therefore in the range of 500
k
. From that, the value of resistor R1, depending on the desired minimum battery voltage V
BAT,
can be
calculated using Equation 3.
TPS61030
TPS61031, TPS61032
SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
The output voltage of the TPS61030 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 R6 is typically 500 mV. Based on those
two values, the recommended value for R4 should be lower than 500 k
, 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
. 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 3.3 V is needed, a 1-M
resistor should be chosen for R3. If for any
reason the value for R4 is chosen significantly lower than 200 k
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
13
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