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參數(shù)資料
| 型號： | PTB48540CAZ |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 10 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, PACKAGE-13 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 219K |
| 代理商： | PTB48540CAZ |
Application Notes
For technical support and further information visit http://power.ti.com
Table 2-2
DC/DC CONVERTER ADJUSTMENT RESISTOR VALUES
Series Pt #
PTB48540B
PTB48540A
PTB48540C
Vo(nom)
3.3 V
5 V
12 V
Va(req’d)
2.95
(90.0)k
3.0
(146.0)k
3.05
(223.0)k
3.1
(340.0)k
3.15
(534.0)k
3.2
(923.0)k
3.25
(2090.0)k
3.3
3.35
1190.0k
3.4
501.0k
3.45
272.0k
3.5
157.0k
3.55
88.4k
3.6
42.5k
3.65
9.7k
4.5
(258.0)k
4.6
(364.0)k
4.7
(541.0)k
4.8
(895.0)k
4.9
(1960.0)k
5.0
5.1
578.0k
5.2
234.0k
5.3
119.0k
5.4
62.1k
5.5
27.7k
10.8
(399.0)k
11.0
(499.0)k
11.5
(1110.0)k
12.0
12.5
87.8k
13.0
18.9k
13.2
7.5k
R
1 = (Blue)
R
2 = Black
PTB48540 Series
Adjusting the Output Voltage of the PTB48540
Series of Power Over Ethernet Modules
The set-point output voltage of the PTB48540 series of
PoE modules may be adjusted (trimmed) by up to ±10 %.
This is accomplished with the addition of a single exter-
nal resistor. For the input voltage range specified in the
data sheet, Table 2-1 gives the allowable adjustment range
for each model as Vo (min) and Vo (max).
Adjust Up:
An increase in the output voltage is obtained
by adding a resistor, R2 between pin 2 (Vout Adj), and
pin 1 (–Vout).
Adjust Down:
Add a resistor (R1), between pin 2 (Vout Adj)
and pin 3 (+Vout).
Refer to Figure 2-1 and Table 2-2 for both the placement and
value of the required resistor, (R1) or R2.
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas.
(R1)
=
56.2 (Va – 1.225)
– Rs
k
Vo – Va
R2
=
68.845
– Rs
k
Va – Vo
Where,
Vo = Original output voltage
Va = Adjusted output voltage
Rs = Internal resistance (Table 2-1)
Notes:
1. Use only a single 1 % resistor in either the (R1) or R2
location. Place the resistor as close to the module as
possible.
2. Never connect capacitors to Vo adjust. Any capacitance
added to the Vo adjust control pin will affect the stability
of the module.
3. The output power is limited to 10 W. If the output
voltage is increased, the maximum load current must
be derated according to the following equation.
Io(max)
= 10
Va
In any instance, the load current must not exceed the
converter’s rated current (See Table 2-1).
Table 2-1
DC/DC CONVERTER ADJUSTMENT PARAMETERS
Series Pt #
PTB48540B
PTB48540A
PTB48540C
Rated Current 3
3 A
2 A
0.85 A
Vo(nom)
3.3 V
5 V
12 V
Vo(min)
2.95 V
4.5 V
10.8 V
Vo(max)
3.65 V
5.5 V
13.2 V
Rs (k
)
187
110
49.9
+V
OUT
V
OUT Adj
–V
OUT
L
O
A
D
(R
1)
Adjust Dn
R
2
Adjust Up
1
2
3
PTB48540
Figure 2-1; Adjust Resistor Placement
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