參數(shù)資料
型號(hào): PTH04040WAS
廠商: TEXAS INSTRUMENTS INC
元件分類: 電源模塊
英文描述: 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
封裝: DIP-20
文件頁(yè)數(shù): 3/25頁(yè)
文件大?。?/td> 535K
代理商: PTH04040WAS
Rset + 10 kW
0.8 V
Vout * 0.8 V
* 2.49 kW
RSET
1%
0.05 W
PTH04040W
12
15
9
10 13
16
11
14
18
VO
CO
+Sense
Sense
GND
Track
Adjust
17
GND
www.ti.com
SLTS238C – SEPTEMBER 2005 – REVISED JUNE 2010
ADJUSTING THE OUTPUT VOLTAGE OF THE PTH04040W
The VO Adjust control (pin 17) sets the output voltage of the PTH04040W to a value higher than 0.8 V. The
adjustment range is from 0.8 V to 2.5 V. For an output voltage other than 0.8 V a single external resistor, RSET 1,
must be connected directly between the VO Adjust (pin 17) and the output GND (pin 16)
(2). Table 2 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 is calculated using the following formula, or by
selecting from the range of values given in Table 3. Figure 9 shows the placement of the required resistor.
(1)
Table 2. Preferred Values of Rset for Standard Output Voltages
VOUT (Standard)
(1)
RSET (Preferred Value)
VOUT (Actual)
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
(1)
The nominal input voltage must be at least 2 × VO. Output voltage regulation is specified with an input voltage within ±10% from nominal
3.3 V or 5 V. For example, for VI = 5 V and VO = 2.5 V, the input can vary between 4.5 V and 5.5 V.
Figure 9. VO Adjust Resistor Placement
Copyright 2005–2010, Texas Instruments Incorporated
11
Product Folder Link(s): PTH04040W
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