參數(shù)資料
型號： TPS5103DB
廠商： Texas Instruments, Inc.
英文描述： MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
中文描述： 多模同步DC / DC控制器
文件頁數(shù)： 21/37頁
文件大小： 1052K
代理商： TPS5103DB
Rz2
(Vz–Vr)
Vr–Vo
Rtop
Vr
Rbtm
TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240 – SEPTEMBER 1999
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
output voltage setpoint calculation
The output voltage is set by the reference voltage and the voltage divider. In TPS5102, the reference voltage
is 1.185 V, and the divider is composed of two resistors in the EVM design that are R4 and R5, or R14 and R15.
The equation for the setpoint is:
R2
R1
Vo
Vr
Vr
Where R1 is the top resistor (k
) like R4 or R15; R2 is the bottom resistor (k
) such as R5 or R14; Vo is the
required output voltage (V); Vr is the reference voltage (1.185 V in TPS5103).
Example: R1 = 1 k
; Vr = 1.185 V; Vo = 1.8 V, then R2 = 1.9 k
.
For your convenience, some of the most popular output voltage setpoints are calculated in the table below:
Vo
R1 (top) (k
)
R2 (bottom) (k
)
1.3 V
1.5 V
1.8 V
2.5 V
3.3 V
5.0 V
1
1
1
1
1
1
10
3.7
1.9
0.9
0.56
0.31
If higher precision resistor is used, the output voltage setpoint can be more accurate.
In some applications, the output voltage is required to be lower than the reference voltage. With few extra
components, the lower voltage can be easily achieved. The drawing below shows the method.
TPS5103
VCC
VO
R(top)
R(bottom)
Rz1
Zener
INV
Rz2
In the schematic, the Rz1, Rz1, and the zener are the extra components. Rz1 is used to give zener enough
current to build up the zener voltage. The zener voltage is added to INV through Rz2. Therefore, the voltage
on INV is still equal to the IC internal voltage (1.185 V) even if the output voltage is regulated at lower setpoint.
The equation for setting up the output voltage is shown below:
Where Rz2 is the adjusting resistor for low output voltage; Vz is the zener voltage; Vr is the internal reference
voltage; Rtop is the top resistor of voltage sensing network; Rbtm is the bottom resistor of the sensing network;
Vo is the required output voltage setpoint.
Example: Assuming the required output voltage setpoint is Vo = 0.8 V, Vz = 5 V; Rtop = 1 k
; Rbottom = 1 k
,
then the Rz2 = 2.43 k
.
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TPS5103IDBR 功能描述:DC/DC 開關(guān)控制器 Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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