PT5527A datasheet(4/9 Pages) TI1

Part #	PT5527A

Description	1.5-A 5-V/3.3-V Input Adjustable Integrated Switching Regulator

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Application Notes

For technical support and more information, see inside back cover or visit www.ti.com

PT5500/5520 Series

Adjusting the Output Voltage of the PT5500/20

Series of Excalibur

 Step-Down ISRs

The output voltage of both the PT5500 and PT5520

series ISRs may be adjusted higher or lower than the

factory trimmed pre-set voltage with the addition of a

single external resistor. Table 1 accordingly gives the

allowable adjustment range for each model for either

series as Va (min) and Va (max).

Adjust Up:

An increase in the output voltage is obtained by

adding a resistor R2, between pin 5 (Vo adj) and pin 3 (GND).

Adjust Down:

Add a resistor (R1), between pin 5 (Vo adj) and

pin 4 (Vout).

Figure 1

The values of (R

1) [adjust down], and R2 [adjust up], can

also be calculated using the following formulas. Refer to

Figure 1 and Table 2 for both the placement and value of the

required resistor; either (R

1) or R2 as appropriate.

(R1)

=

Ro (Va – 0.9)

– Rs

k

Ω

Vo – Va

R2

=

0.9 Ro

– Rs

k

Ω

Va – Vo

Where:

Vo = Original output voltage

Va = Adjusted output voltage

Ro = The resistance value from Table 1

Rs = The series resistance from Table 1

Table 1

ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS

3.0 Adc Rated

PT5501

PT5502

PT5503

PT5504

PT5505

PT5506

PT5507

1.5 Adc Rated

PT5521

PT5522

PT5523

PT5524

PT5525

PT5526

PT5527

Vo (nom)

3.3

2.5

2.0

1.8

1.5

1.2

1.0

Va (min)

2.88

1.97

1.64

1.5

1.3

1.08

0.97

Va (max)

3.5

2.95

2.45

2.25

1.95

1.65

1.45

Ro (k

Ω

Ω)

10.0

10.2

Rs (k

Ω)

49.9

20.0

R2

Adjust Up

C1

1

µF Ceramic

(Optional)

C2

100

µF

(Req'd)

+V

O

COM

+V

IN

+

(R1)

Adj Down

PT5500

2

35

4

Vin

V o

Vo(adj)

GND

Notes:

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

location. Place the resistor as close to the ISR as possible.

2. Never connect capacitors from Vo adj to either GND or

Vout. Any capacitance added to the Vo adjust pin will

affect the stability of the ISR.

3. For each model, adjustments to the output voltage may

place additional limits on the minimum input voltage.

The revised minimum input voltage must comply with the

following requirement.

Vin(min) = (Va + 0.5)V or as specified in the data sheet,

whichever is greater.

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