参数资料
型号: PTH12010LAST
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: DIP-10
文件页数: 26/27页
文件大小: 931K
代理商: PTH12010LAST
www.ti.com
APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
V
I
+
C
330 F
(Optional)
O
m
C
560 F
(Required)
I
m
+
GND
V
O
V Sense
O
R
SET
1%
0.1W
PTH12010x
1
10
4
5
6
2
3
9
7
GND
8
NOTES
SLTS205G – JUNE 2003 – REVISED FEBRUARY 2007
The VO Adjust control (pin 4) sets the output voltage of the PTH12010 product. The adjustment range is from 1.2
V to 5.5 V for the W-suffix modules, and 0.8 V to 1.8 V for L-suffix modules. The adjustment method requires the
addition of a single external resistor, RSET, that must be connected directly between the VO Adjust and GND
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. For other output voltages, the value of the required
resistor can either be calculated using Equation 1, or simply selected from the range of values given in Table 3.
Figure 11 shows the placement of the required resistor.
Table 1. Standard Values of RSET for Standard Output Voltages
PTH12010W
PTH12010L
VO (Required)
RSET
VO (Actual)
RSET
VO(Actual)
5 V
280
5.009 V
N/A
3.3 V
2.0 k
3.294 V
N/A
2.5 V
4.32 k
2.503 V
N/A
2 V
8.06 k
2.010 V
N/A
1.8 V
11.5 k
1.081 V
130
1.800 V
1.5 V
24.3 k
1.506 V
3.57 k
1.499 V
1.2 V
Open
1.200 V
12.1 k
1.201 V
1.1 V
N/A
18.7 k
1.101 V
1.0 V
N/A
32.4 k
0.999 V
0.9 V
N/A
71.5 k
0.901 V
0.8 V
N/A
Open
0.800 V
Figure 11. Vo Adjust Resistor Placement
1. A 0.05 W rated 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 4 and 7 using dedicated PCB traces.
2. Never connect capacitors from VO Adjust to either GND or VO. Any capacitance added to the VO Adjust
pin affects the stability of the regulator.
8
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