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参数资料
| 型号： | PTB48502AAZ |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT 48.6 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-10 |
| 文件页数： | 3/17页 |
| 文件大小： | 408K |
| 代理商： | PTB48502AAZ |
www.ti.com
APPLICATION INFORMATION
ADJUSTING THE LOWER OUTPUT
CALCULATION OF THE ADJUST RESISTOR
R
1
[Adjust Up] + Rp
Va
Va * Vo
* Rs kW
(1)
R
2
[Adjust Down] + Rn
Va
Vo * Va
* Rs kW
(2)
+VO
PTB4850x
6
9
COM
7
VO2
VO2Adj
R1
Adjust
Up
PTB4850x
6
9
COM
7
+VO
VO2
VO2Adj
(R2)
Adj Down
SLTS218C – SEPTEMBER 2003 – REVISED AUGUST 2006
VOLTAGE OF THE PTB4850x
The value of the adjust resistor is calculated using
The PTB4850x series of DC/DC converters are
one of the following equations. Use the equation for
designed to produce two logic-level supply voltages
R1 to adjust up, or (R2) to adjust down.
for use with the AC-7 ADSL chipset. The magnitude
of lowest output voltage (Vo2) can be adjusted higher
or lower by up to 10% or —20% of the nominal. The
adjustment method uses a single external resistor.1
The value of the resistor determines the amount of
adjustment, and its placement determines whether
the voltage is increased or decreased. The resistor
values can be calculated using the appropriate
Where:
formula (see Equation 1 and Equation 2), or simply
Vo = Magitude of the original output voltage
selected from the range of values given in Table 2.
The placement of each resistor is as follows.
Va = Magnitude of the adjusted voltage
Adjust Up: To increase the magnitude of both
output voltages, place a resistor R1 between Vo2 Adj
(pin 9) and the Vo2 (pin 6) voltage rail; see
Table 1. Adjustment Range and Formula
Parameters
Part No.
PTB48500(1)A
PTB48502A
Vo(nom)
1.2 V
Va(min)
0.96 V
0.84 V
Va(max)
1.32 V
Rp (k)
1.648
1.196
Rn (k)
4.624
3.598
Rs (k)
18.2V
13.0
NOTES:
1. A 0.05 W rated resistor may be used. The
tolerance should be 1%, with a temperature
Figure 17. Adjust Up
stability of 100 ppm/
°C or better. Place the
resistor in either the R1 or (R2) location, as close
Adjust Down: To decrease the magnitude of both
to the converter as possible.
output voltages, add a resistor (R2), between Vo2 Adj
2. Never connect capacitors to the Vo2 Adj pin.
(pin 9) and the COM (pin 7) voltage rail; see
Capacitance added to this pin can affect the
stability of the regulated output.
Table 2. Adjust Resistor Values
Part No.
PTB4850xA
PTB48502A
% Adjust
Va (V)
R1 / (R2)(1)
–21
0.848
N/A
(0.5) k
–20
0.960
(0.3) k
(1.4) k
–19
0.972
(1.5) k
(2.3) k
–18
0.984
(2.9) k
(3.4) k
–17
0.996
(4.4) k
(4.6) k
–16
1.008
(6.1) k
(5.9) k
–15
1.020
(8.0) k
(7.4) k
–14
1.032
(10.2) k
(9.1) k
Figure 18. Adjust Down
(1)
R1 =Adjust up, (R2) =Adjust down
11
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