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Figure 2.3.7-1: TL780-05 Fixed-output voltage regulator implementation

diagram. Reproduced with permission from Texas Instruments.

2.3.8 Voltage Regulator Comparison

Each discussed circuit has its own advantages and disadvantages. The specifics

of these properties were discussed in each section. Given the requirements of

the voltage regulator, the LM1117 and TL780-05 is the best fit. It has a good

temperature range, small size, simplicity in implementation, and can accept a

relatively wide range of voltage input while outputting a constant 3.3Vdc or 5Vdc,

which should be sufficient for the other components on the boards. Both units will

have voltage regulators on their respective boards.

The portable unit will use a voltage regulator to ensure voltage coming from the

fixed unit is indeed regulated and acceptable for the battery. The portable unit will

use a voltage regulator to ensure stable power to its own circuit. A tabular

summary of the overall comparison is available in Table 2.2.8-1.

Regulation

Solution

Input

Voltage

Output

Voltage

Compact?

Less than

$3?

Lead

Times

Zener Diode

Variable

Fixed to diode

spec

Yes

<1 Week

Voltage Divider

Variable

Yes

<1 Week

Regulator

Board

Variable

Fixed to 12V

and 5V

2-3 Weeks

LM 317

Variable

Adjustable to

Yes

1-2 Weeks

LM1117#33

Variable

3.3V Fixed

Yes

1-2 Weeks

TL780-05

Variable

5V Fixed

Yes

1-2 Weeks

Table 2.3.8-1: Comparison of voltage regulators

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 147 148

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