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PTB48510BAH Datasheet(PDF) 10 Page - Texas Instruments

Part # PTB48510BAH
Description  DUAL COMPLEMENTARY-OUTPUT DC/DC CONVERTER FOR DSL
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

PTB48510BAH Datasheet(HTML) 10 Page - Texas Instruments

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R
2
[Adjust Down] +
Ro 2 Va * Vr
2 Vo * Va
* Rs kW
R
1
[Adjust Up] +
Vr Ro
2 Va * Vo
* Rs kW
5
V
O1
6
V
OAdj
7
COM
8
V
O2
PTB48510
V
O2
UDG-07041
V
O1
R
1
Adjust Up
5
V
O1
6
V
OAdj
7
COM
8
V
O2
PTB48510
V
O2
UDG-07042
V
O1
R
2
Adjust Down
Not Recommended for New Designs
PTB48510
PTB48511
SLTS219F – FEBRUARY 2004 – REVISED MARCH 2007
www.ti.com
APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE OF THE PTB4851x SERIES OF DC/DC CONVERTERS
The PTB48510 and PTB48511 DC/DC converters produce a balanced pair of complimentary output voltages.
They are identified VO1 and VO2, respectively. The magnitude of both output voltages can be adjusted together as
a pair, higher or lower, by up to ±10% of their nominal. The adjustment method uses a single external resistor.1
The value of the resistor determines the adjustment magnitude, and its placement determines whether the
magnitude is increased or decreased. The resistor values can be calculated using the appropriate formula (see
below). The formula constants are given in Table 1. The placement of each resistor is as follows.
Adjust Up: To increase the magnitude of both output voltages, place a resistor R1 between VO 1Adj (pin 7) and
the VO2 (pin 8) voltage rail; see Figure 16.
Adjust Down: To decrease the magnitude of both output voltages, add a resistor (R2), between VOAdj (pin 7)
and the VO1 (pin 5) voltage rail; see Figure 17.
Figure 16. Adjust Up Resistor Placement
Figure 17. Adjust Down Resistor Placement
ADJUST RESISTOR CALCULATION
The value of the adjust resistor is calculated using one of the following equations. Use the equation for R1 to
adjust up, or (R2) to adjust down.
(1)
(2)
Where:
VO = Magitude of the original VO1 or VO2
Va = Magnitude of the adjusted voltage
Vr = The reference voltage from Table 1
RO = The resistance value in Table 1
RS = The series resistance from Table 1
10
Copyright © 2004–2007, Texas Instruments Incorporated


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