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PTH08T231WAST Datasheet(PDF) 11 Page - Texas Instruments

Part # PTH08T231WAST
Description  6-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans?
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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PTH08T231WAST Datasheet(HTML) 11 Page - Texas Instruments

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APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
R
SET
=10k
x
W
0.69
V
-0.69
O
-1.43k W
(1)
PTH08T230W
GND
GND
VoAdj
7
5
+Sense
+Sense
−Sense
−Sense
V
O
V
O
R
1%
SET
0.05W
3
6
4
PTH08T230W, PTH08T231W
SLTS265F – NOVEMBER 2005 – REVISED MAY 2007
The VO Adjust control (pin 7) sets the output voltage of the PTH08T230/231W. The adjustment range is 0.69V to
5.5V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected
directly between the VO Adjust and the –Sense pins. 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 value can either be calculated using the following formula, or
simply selected from the values given in Table 2. Figure 11 shows the placement of the required resistor.
Table 1. Preferred Values of RSET for Standard Output Voltages
VO (Standard) (V)
RSET (Standard Value) (kΩ)
VO (Actual) (V)
5.0 (1)
0.169
5.01
3.3
1.2
3.30
2.5
2.37
2.51
1.8
4.7
1.81
1.5
6.98
1.51
1.2 (2)
12.1
1.20
1.0 (2)
20.5
1.01
0.7 (2)
681
0.70
(1)
For VO > 3.6 V, the minimum input voltage is (VO + 1) V.
(2)
The maximum input voltage is (VO × 11) V or 14 V, whichever is less. The maximum allowable input
voltage is a function of switching frequency and may increase or decrease when the Smart Sync
feature is used. Review the Smart Sync application section for further guidance.
(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 7 and 6, as close to the regulator as possible, using dedicated PCB traces.
(2)
Never connect capacitors from VO Adjust to either GND, VO, or +Sense. Any capacitance added to the VO Adjust pin
affects the stability of the regulator.
Figure 11. VO Adjust Resistor Placement
Copyright © 2005–2007, Texas Instruments Incorporated
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11
Product Folder Link(s): PTH08T230W PTH08T231W


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