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| 型號： | NCP1523 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 6-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans |
| 中文描述： | 6甲，2.2 V至5.5 V輸入，非隔離，寬輸出，可調(diào)電源模塊的TurboTrans |
| 文件頁數(shù)： | 11/35頁 |
| 文件大小： | 1128K |
| 代理商： | NCP1523 |
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APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
The V
O
Adjust control (pin 7) sets the output voltage of the PTH04T230/231W. The adjustment range of the
PTH04T230/231W is 0.69 V to 3.6 V. The adjustment method requires the addition of a single external resistor,
R
, that must be connected directly between the V
Adjust and the –Sense pins.
Table 1
gives the standard
value of the external resistor for a number of standard voltages, along with the actual output voltage that this
resistance value provides.
R
SET
10 k
0.69
V
O
0.69
1.43 k
(1)
UDG06043
R
SET
1%
0.05 W
V
O
+Sense
Sense
VoAdj
GND
3
4
5
6
7
+Sense
Sense
GND
V
O
PTH04T230/231W
PTH04T230W, PTH04T231W
SLTS271A–SEPTEMBER 2006–REVISED OCTOBER 2006
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
.
Figure 9
shows the placement of the required
resistor.
Table 1. Preferred Values of R
SET
for Standard Output Voltages
R
SET
(Standard Value) (k
)
3.3
(1)
1.21
2.5
(1)
2.37
1.8
(1)
4.75
1.5
(1)
6.98
1.2
12.1
1.0
20.5
0.7
681
V
O
(Standard) (V)
V
O
(Actual) (V)
3.304
2.506
1.807
1.510
1.200
1.004
0.700
(1)
The minimum input voltage is 2.2 V or (V
O
+ 0.5) V, whichever is greater.
(1)
R
SET
:
Use a 0.05 W resistor with a tolerance of 1% and temperature stability of 100 ppm/
°
C (or better). Connect the
resistor directly between pins 7 and 6, as close to the regulator as possible, using dedicated PCB traces.
Never connect capacitors from V
O
Adjust to either GND, V
O
, or +Sense. Any capacitance added to the V
O
Adjust pin
affects the stability of the regulator.
Figure 9. V
O
Adjust Resistor Placement
(2)
11
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