PTB48540C datasheet(7/12 Pages) TI1

Part #	PTB48540C

Description	10-W Power-Over-Ethernet Isolated

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Manufacturer	TI1 [Texas Instruments]

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Application Notes

For technical support and further information visit http://power.ti.com

Table 2-2

DC/DC CONVERTER ADJUSTMENT RESISTOR VALUES

Series Pt #

PTB48540B

PTB48540A

PTB48540C

Vo(nom)

3.3 V

5 V

12 V

Va(req’d)

2.95

(90.0)k

Ω

3.0

(146.0)k

Ω

3.05

(223.0)k

Ω

3.1

(340.0)k

Ω

3.15

(534.0)k

Ω

3.2

(923.0)k

Ω

3.25

(2090.0)k

Ω

3.3

3.35

1190.0k

Ω

3.4

501.0k

Ω

3.45

272.0k

Ω

3.5

157.0k

Ω

3.55

88.4k

Ω

3.6

42.5k

Ω

3.65

9.7k

Ω

•

4.5

(258.0)k

Ω

4.6

(364.0)k

Ω

4.7

(541.0)k

Ω

4.8

(895.0)k

Ω

4.9

(1960.0)k

Ω

5.0

5.1

578.0k

Ω

5.2

234.0k

Ω

5.3

119.0k

Ω

5.4

62.1k

Ω

5.5

27.7k

Ω

•

10.8

(399.0)k

Ω

11.0

(499.0)k

Ω

11.5

(1110.0)k

Ω

12.0

12.5

87.8k

Ω

13.0

18.9k

Ω

13.2

7.5k

Ω

R

1 = (Blue)

R

2 = Black

PTB48540 Series

Adjusting the Output Voltage of the PTB48540

Series of Power Over Ethernet Modules

The set-point output voltage of the PTB48540 series of

PoE modules may be adjusted (trimmed) by up to ±10 %.

This is accomplished with the addition of a single exter-

nal resistor. For the input voltage range specified in the

data sheet, Table 2-1 gives the allowable adjustment range

for each model as Vo (min) and Vo (max).

Adjust Up:

An increase in the output voltage is obtained

by adding a resistor, R2 between pin 2 (Vout Adj), and

pin 1 (–Vout).

Adjust Down:

Add a resistor (R1), between pin 2 (Vout Adj)

and pin 3 (+Vout).

Refer to Figure 2-1 and Table 2-2 for both the placement and

value of the required resistor, (R1) or R2.

The values of (R1) [adjust down], and R2 [adjust up], can

also be calculated using the following formulas.

(R1)

=

56.2 (Va – 1.225)

– Rs

k

Ω

Vo – Va

R2

=

68.845

– Rs

k

Ω

Va – Vo

Where,

Vo = Original output voltage

Va = Adjusted output voltage

Rs = Internal resistance (Table 2-1)

Notes:

1. Use only a single 1 % resistor in either the (R1) or R2

location. Place the resistor as close to the module as

possible.

2. Never connect capacitors to Vo adjust. Any capacitance

added to the Vo adjust control pin will affect the stability

of the module.

3. The output power is limited to 10 W. If the output

voltage is increased, the maximum load current must

be derated according to the following equation.

Io(max)

= 10

Va

In any instance, the load current must not exceed the

converter’s rated current (See Table 2-1).

Table 2-1

DC/DC CONVERTER ADJUSTMENT PARAMETERS

Series Pt #

PTB48540B

PTB48540A

PTB48540C

Rated Current 3

3 A

2 A

0.85 A

Vo(nom)

3.3 V

5 V

12 V

Vo(min)

2.95 V

4.5 V

10.8 V

Vo(max)

3.65 V

5.5 V

13.2 V

Rs (k

Ω

Ω)

187

110

49.9

+V

OUT

V

OUT Adj

–V

OUT

L

O

A

D

(R

1)

Adjust Dn

R

2

Adjust Up

1

2

3

PTB48540

Figure 2-1; Adjust Resistor Placement

Not Recommended for New Designs

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