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参数资料
| 型号： | PTH03050WAST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | SMT-6 |
| 文件页数： | 17/19页 |
| 文件大小： | 590K |
| 代理商： | PTH03050WAST |
Application Notes
For technical support and further information, visit http://power.ti.com
Adjusting the Output Voltage of the PTH03050W &
PTH05050W Wide-Output Adjust Power Modules
The Vo Adjust control (pin 5) sets the output voltage to a
value higher than 0.8 V. The adjustment range of the
PT03050W (3.3-V input) is from 0.8 V to 2.5 V 1, and
the PTH05050W (5-V input) from 0.8 V to 3.6 V. The
adjustment method requires the addition of a single
external resistor, Rset, that must be connected directly
between the Vo Adjust and GND pins 2. Table 2-1 gives
the preferred value of the external resistor for a number
of standard voltages, along with the actual output volt-
age that this resistance value provides.
For other output voltages the value of the required resistor
can either be calculated using the following formula, or
simply selected from the range of values given in Table 2-2.
Figure 2-1 shows the placement of the required resistor.
Rset
= 10 k
0.8 V
– 2.49 k
Vout – 0.8 V
Figure 2-1; Vo Adjust Resistor Placement
Notes:
1. Modules that operate from a 3.3-V input bus should
not be adjusted higher than 2.5 V.
2. A 0.05-W resistor may be used. The tolerance should
be 1%, with temperature stability of 100 ppm/°C (or
better). Place the resistor as close to the regulator as
possible. Connect the resistor directly between pins 5
and 1 using dedicated PCB traces.
3. Never connect capacitors from Vo Adjust to either GND or
Vout. Any capacitance added to the Vo Adjust pin will affect
the stability of the regulator.
0.800
Open
0.825318 k
0.850
158 k
0.875104 k
0.900
77.5 k
0.92561.5
k
0.950
50.8 k
0.97543.2 k
1.000
37.5 k
1.02533.1 k
1.050
29.5 k
1.07526.6 k
1.100
24.2 k
1.12522.1 k
1.150
20.4 k
1.17518.8 k
1.200
17.5 k
1.22516.3 k
1.250
15.3 k
1.27514.4 k
1.300
13.5 k
1.32512.7 k
1.350
12.1 k
1.37511.4 k
1.400
10.8 k
1.42510.3 k
1.450
9.82 k
1.4759.36 k
1.50
8.94 k
1.55
8.18 k
1.60
7.51 k
1.656.92 k
1.70
6.4 k
1.755
.93 k
1.80
5.51 k
1.855
.13 k
1.90
4.78 k
1.954.47 k
Vout (Standard)
Rset (Pref’d Value)
Vout (Actual)
3.3 V 1
698
3.309V
2.5 V
2.21 k
2.502 V
2 V
4.12 k
2.010 V
1.8 V
5.49 k
1.803 V
1.5 V
8.87 k
1.504 V
1.2 V
17.4 k
1.202 V
1 V
36.5 k
1.005 V
0.8 V
Open
0.8 V
Table 2-1; Preferred Values of Rset for Standard Output Voltages
PTH03050W & PTH05050W
Table 2-2; Output Voltage Set-Point Resistor Values
Va Req’dRset
2.00
4.18 k
2.053.91 k
2.10
3.66 k
2.153.44 k
2.20
3.22 k
2.253.03 k
2.30
2.84 k
2.352.67 k
2.40
2.51 k
2.452.36 k
2.50
2.22 k
2.55
2.08 k
2.60
1.95 k
2.651.83 k
2.70
1.72 k
2.751.61 k
2.80
1.51 k
2.851.41 k
2.90
1.32 k
2.951.23 k
3.00
1.15 k
3.051.07 k
3.10
988
3.15914
3.20
843
3.25775
3.30
710
3.35647
3.40
587
3.455
29
3.50
473
3.55
419
3.60
367
V
IN
C
IN
100 F
(Required)
+
C
OUT
100 F
(Optional)
+
GND
V
OUT
R
SET
1 %
0.1 W
PTH03050W
15
6
3
4
2
Track
V
IN
V
O
GND
Inhibit
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