参数资料
型号: PTH08T240FAS
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
文件页数: 2/39页
文件大小: 1345K
代理商: PTH08T240FAS
APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
R
=10k
x
SET
W
0.69
V
-0.69
O
-1.43kW
(1)
+Sense
Sense
VoAdj
GND
PTH08T240F
3
5
6
7
8
+Sense
Sense
GND
4
GND
+
VO
RSET
1%
0.05 W
UDG06077
CO
SLTS277D – DECEMBER 2006 – REVISED MARCH 2009 ............................................................................................................................................... www.ti.com
The VOAdjust control (pin 8) sets the output voltage of the PTH08T240F. The adjustment range is 0.69 V to
2.0 V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected
directly between the VOAdjust and – 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.
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 13 shows the placement of the required
resistor.
Table 1. Standard Values of RSET for Standard Output Voltages
VO (Standard) (V)
RSET (Standard Value) (k)
VO (Actual) (V)
1.8
4.75
1.807
1.5
6.98
1.510
1.2
12.1
1.200
1.1
15.4
1.100
1
20.5
1.004
0.9
31.6
0.899
(1)
RSET: 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 8 and 7, as close to the regulator as possible, using dedicated PCB traces.
(2)
Never connect capacitors to VOAdjust (pin 8). Any capacitance added to the VOAdjust pin affects the stability of the
regulator.
Figure 13. VO Adjust Resistor Placement
10
Copyright 2006–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH08T240F
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