參數(shù)資料
型號(hào)： PTH12030WAS
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源模塊
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
封裝： DIP-13
文件頁(yè)數(shù)： 25/26頁(yè)
文件大?。?/td> 794K
代理商： PTH12030WAS
APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
NOTES
Equation 1. Output Voltage Adjust
R
=10k
x
SET
W
0.8V
-R
k
S
W
V
-V
O
min
(1)
SLTS211H – MAY 2003 – REVISED DECEMBER 2008 .................................................................................................................................................... www.ti.com
The VOAdjust control (pin 5) sets the output voltage of the PTH12030W/L. The adjustment range is 1.2V 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 required resistor can either be
calculated using Equation 1, or simply selected from the range of values given in Table 3. Figure 10 shows the
placement of the required resistor.
Table 1. Standard Values of RSET for Standard Output Voltages
PTH12030W
PTH12030L
VO (Required) (V)
RSET (k)
VO (Actual) (V)
RSET(k)
VO (Actual) (V)
5
0.280
5.009
N/A
3.3
2
3.294
N/A
2.5
4.32
2.503
N/A
2
8.06
2.01
N/A
1.8
11.5
1.801
0.130
1.8
1.5
24.3
1.506
3.57
1.499
1.2
Open
1.2
12.1
1.201
1.1
N/A
18.7
1.101
1
N/A
32.4
0.999
0.9
N/A
71.5
0.901
0.8
N/A
Open
0.8
Figure 10. Vo Adjust Resistor Placement
1. RSET: Use a 0.05 W resistor with a tolerance of 1% and temperature stability of 100 ppm/C (or better).
Connect the resistor directly between pins 5 and 7, as close to the regulator as possible, using dedicated
PCB traces.
2. Never connect capacitors from VOAdjust to either GND or VO. Any capacitance added to the VO Adjust pin
affects the stability of the regulator.
Use Equation 1 to calculate the adjust resistor value. See Table 2 for parameters, RS and Vmin.
Table 2. Adjust Equation Parameters
PARAMETERS
PTH12030W
PTH12030L
V(MIN)
1.2 V
0.8 V
V(MAX)
5.5 V
1.8 V
RS
1.82 k
7.87 k
8
Copyright 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): PTH12030W/L
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