參數(shù)資料
型號(hào): ATH18K12-9S
英文描述: 18-A, 12-V Input Non-Isolated Wide-Output Adjust Power Module
中文描述: 18甲,12 V輸入非隔離寬輸出調(diào)節(jié)電源模塊
文件頁(yè)數(shù): 5/13頁(yè)
文件大?。?/td> 1470K
代理商: ATH18K12-9S
Application Notes
North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662
Adjusting the Output Voltage of the ATH18K12
Wide-Output Adjust Power Module
T he
V
o
Adjust
control (pin 4) sets the output voltage of
the AT H18K12 product. T he adjustment range is from 1.2 V
to 5.5 V. To adjust the output voltage above 1.2 V a single
external resistor, R
set
, must be connected directly between
the
V
o
Adjust
and
GND
pins
1
. Table 1-1 gives the preferred
value for 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 1-2.
Figure 1-1 shows the placement of the required resistor.
R
set
= 10 k
·
0.8 V
– 1.82 k
V
out
– 1.2 V
Figure 1-1; V
o
Adjust Resistor Placement
Notes:
1. Use a 0.1 W resistor. T he 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 4 and 7 using dedicated
PCB traces.
2. Never connect capacitors from
V
o
Adjust
to either
GND
or
V
out
. Any capacitance added to the
V
o
Adjust
pin will affect
the stability of the regulator.
PTH12020W
1
4
5
6
C
330μF
+
GND
V
OUT
V
O
Sense [Note 3]
V
O
Adj
GND
V
O
Sense
V
OUT
R
0.1 W, 1 %
10
9
8
7
GND
1.200
1.225
1.250
1.275
1.300
1.325
1.350
1.375
1.400
1.425
1.450
1.475
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.05
2.10
2.15
2.20
2.25
2.30
2.35
2.40
2.45
2.50
2.55
2.60
2.65
2.70
Open
318 κ
158 κ
105 κ
78.2 κ
62.2 κ
51.5 κ
43.9 κ
38.2 κ
33.7 κ
30.2 κ
27.3 κ
24.8 κ
21 κ
18.2 κ
16 κ
14.2 κ
12.7 κ
11.5 κ
10.5 κ
9.61 κ
8.85 κ
8.18 κ
7.59 κ
7.07 κ
6.6 κ
6.18 κ
5.8 κ
5.45 κ
5.14 κ
4.85 κ
4.85 κ
4.33 κ
4.11 κ
3.89 κ
3.7 κ
3.51 κ
V
out
(Standard)
5 V
3.3 V
2.5 V
2 V
1.8 V
1.5 V
1.2 V
R
set
(Pref’d Value)
280
2 κ
4.32 κ
8.06 κ
11.5 κ
24.3 κ
Open
V
out
(Actual)
5.009 V
3.294V
2.503 V
2.010V
1.801 V
1.506 V
1.200 V
Table 1-1; Preferred Values of R
set
for Standard Output Voltages
ATH18K12 Series
Table 1-2; Output Voltage Set-Point Resistor Values
V
a
Req’d
R
set
V
a
Req’d
2.75
2.80
2.85
2.90
2.95
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
3.55
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
R
set
3.34 κ
3.18 κ
3.03 κ
2.89 κ
2.75 κ
2.62 κ
2.5 κ
2.39 κ
2.28 κ
2.18 κ
2.08 κ
1.99 κ
1.9 κ
1.82 κ
1.74 κ
1.66 κ
1.58 κ
1.51 κ
1.38 κ
1.26 κ
1.14 κ
1.04 κ
939
847
761
680
604
533
466
402
342
285
231
180
131
85
41
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