Tuesday, 1 October 2013

Current Stabilier and Operational Amplifier OPA2350

Good Evening everyone,

Finally, my LT1932 current stabilizer and Op-amp OPA2350 have arrived. For your information, this is very rare components, its hard to find unless ordered or purchase online.

LT1932
In the previous post, i have post the datasheet of LT1932. At this post, i will summarize the LT1932. The function of LT1932 is used for stabilized the IR LED current to obtain the visible light output gain accuracy. LT1932 Constant Current DC/DC LED Driver in Thin SOT is used for the purposed of stabilizing the current that drives the LED and the appropriate resistor values a shown in Table below

LED Current (mA)
Resistor Value
40
562Ohm
30
750Ohm
20
1.13kOhm
15
1.5kOhm
10
2.26kOhm
5
4.53kOhm

So, the desired value that we expected is 20mA and i should used 1.13kOhm resistor at pin Rset or pin no 4 of LT1932.

The results of IR LED resistor current test is shown in table below.

I LED (mA)
R set Value
25.4
1kOhm
18.2
1.3kOhm
15.7
1.5kOhm

Figure below shows the actual component of LT1932.

OPA2350
This component also is the rare component, and i ordered it together with the LT1932. The datasheet of OPA2350 can be found here http://www.ti.com/lit/ds/symlink/opa2350.pdf. Actually, OPA2350 have 2 input and 2 output. In the circuit diagram, it is label by A and B for example OPA2350 U1:A and OPA2350 U1:B. Figure below shows the OPA2350 diagram.


It is show that for output A is using terminal 1,2,3,4 and 8. For the output B is using 4,5,6,7 and 8.

Figure below shows the actual component of OPA2350



The cost of both components is list at table below.
Component
Quantity
Price
LT1932
1
20.00
OPA2350
1
25.00
                                Total
45.00

The price is quite expensive because the items is seldom and hard to find. But for the successful of the project, there are no other option to make its successful, one word for it SACRIFICE. See you next week.. :)




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