參數(shù)資料
型號： PTH12020WAS
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源模塊
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
封裝： DIP-10
文件頁數(shù)： 26/27頁
文件大?。?/td> 930K
代理商： PTH12020WAS
APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
PTH12020x
14
5
6
+
GND
GN D
10
9
8
7
GND
VO Sense
VOUT
VO Adj
RSET, 1%
VO Sense
VOUT
COUT
330 mF
Equation 1. Output Voltage Adjust
Rset + 10 kW
0.8 V
Vout * Vmin
* Rs kW
(1)
SLTS208I – MAY 2003 – REVISED MARCH 2009 ............................................................................................................................................................. www.ti.com
The VOAdjust control (pin 4) sets the output voltage of the PTH12020W/L. The adjustment range is from 1.2 V to
5.5V for the W-suffix modules, and 0.8V to 1.8V for L-suffix modules. The adjustment method requires the
addition of a single external resistor, RSET, that must be connected directly between the VOAdjust and GND
pins(1). Table 1 gives the standard value of the external resistor for a number of standard voltages, along with the
actual output voltage that this resistance value provides. For other output voltages the value of the required
resistor can either be calculated using Equation 1, or simply selected from the range of values given in Table 3.
Figure 11 shows the placement of the required resistor.
Table 1. Standard Values of Rset for Standard Output Voltages
PTH12020W
PTH12020L
VO(V)
RSET (k)
(Req'd)
(Actual)
5 V
0.280
5.009
N/A
3.3 V
2.0
3.294
N/A
2.5 V
4.32
2.503
N/A
2 V
8.06
2.010
N/A
1.8 V
11.5
1.801
0.130
1.800
1.5 V
24.3
1.506
3.57
1.499
1.2 V
Open
1.200
12.1
1.201
1.1 V
N/A
18.7
1.101
1.0 V
N/A
32.4
0.999
0.9 V
N/A
71.5
0.901
0.8 V
N/A
Open
0.800
(1)
Use a 0.05-W, 1% tolerance with temperature stability of 100 ppm/°C (or better) for Rset. Place the resistor directly
between pins 4 and 7 using dedicated PCB traces.
(2)
Never connect capacitors from VOAdjust to either GND or VO. Any capacitance added to the VOAdjust pin will affect
the stability of the regulator.
Figure 11. Vo Adjust Resistor Placement
Use Equation 1 to calculate the adjust resistor value. See Table 2 for parameters, Rs and Vmin.
Table 2. Adjust Equation Parameters
PARAMETER
PTH12020W
PTH12020L
V(MIN)
1.2 V
0.8 V
RS
1.82 k
7.87 k
8
Copyright 2003–2009, Texas Instruments Incorporated
Product Folder Link(s) :PTH12020W/L
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