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参数资料
| 型号： | PTH04040WAST |
| 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： | ROHS COMPLIANT, DIP-20 |
| 文件页数： | 20/22页 |
| 文件大小： | 747K |
| 代理商： | PTH04040WAST |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltage of the PTH04040W
Wide-Output Adjust Power Modules
The V
O Adjust control (pin 17) sets the output voltage of
the PTH04040W to a value higher than 0.8 V. The adjust-
ment range is from 0.8 V to 3.6 V. For an output voltage
other than 0.8 V a single external resistor, R
SET
1
, must be
connected directly between the V
O Adjust (pin 17) and
the output GND (pin 16) 2. Table 2-1 gives the preferred
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 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.
R
SET
= 10 k
0.8 V
– 2.49 k
V
O – 0.8 V
Figure 2-1; V
O Adjust Resistor Placement
Notes:
1. A 0.05-W rated resistor can 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 17
and 16 using dedicated PCB traces.
2. Never connect capacitors from V
O Adjust to either GND
or V
O. Any capacitance added to the VO Adjust pin will
affect the stability of the regulator.
0.800
Open
0.825
318 k
0.850
158 k
0.875
104 k
0.900
77.5 k
0.925
61.5 k
0.950
50.8 k
0.975
43.2 k
1.000
37.5 k
1.025
33.1 k
1.050
29.5 k
1.075
26.6 k
1.100
24.2 k
1.125
22.1 k
1.150
20.4 k
1.175
18.8 k
1.200
17.5 k
1.225
16.3 k
1.250
15.3 k
1.275
14.4 k
1.300
13.5 k
1.325
12.7 k
1.350
12.1 k
1.375
11.4 k
1.400
10.8 k
1.425
10.3 k
1.450
9.82 k
1.475
9.36 k
1.50
8.94 k
1.55
8.18 k
1.60
7.51 k
1.65
6.92 k
1.70
6.4 k
1.75
5.93 k
1.80
5.51 k
1.85
5.13 k
1.90
4.78 k
1.95
4.47 k
VO (Required)
RSET (Standard)
VO (Actual)
3.3 V
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; Standard Values of R
SET for Common Output Voltages
PTH04040W
Table 2-2; Output Voltage Set-Point Resistor Values
VA Req’d
RSET
VA Req’d
RSET
2.00
4.18 k
2.05
3.91 k
2.10
3.66 k
2.15
3.44 k
2.20
3.22 k
2.25
3.03 k
2.30
2.84 k
2.35
2.67 k
2.40
2.51 k
2.45
2.36 k
2.50
2.22 k
2.55
2.08 k
2.60
1.95 k
2.65
1.83 k
2.70
1.72 k
2.75
1.61 k
2.80
1.51 k
2.85
1.41 k
2.90
1.32 k
2.95
1.23 k
3.00
1.15 k
3.05
1.07 k
3.10
988
3.15
914
3.20
843
3.25
775
3.30
710
3.35
647
3.40
587
3.45
529
3.50
473
3.55
419
3.60
367
CO
GND
VO
RSET
1%
0.05 W
PTH04040W
18
11
17
Adjust
VO
+Sense
GND
9
12
15
–Sense
16
13
10
14
Track
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