SLTS034A Datasheet, PDF(5/10 Page) Texas Instruments – 8A Single Device Power, Up to 90% efficiency (PT6501), Small SIP Footprint

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

SLTS034A Datasheet, PDF (5/10 Pages) Texas Instruments – 8A Single Device Power, Up to 90% efficiency (PT6501), Small SIP Footprint

◁

Application Notes

PT6500 Series

Adjusting the Output Voltage of the

PT6500 5V/3.3V Bus Converters

The output voltage of the Power Trends PT6500 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 in the series as Va (min)

and Va (max).

Adjust Up:

An increase in the output voltage is

obtained by adding a resistor R2, between pin 14 (Vo ad-

just) and pins 7-10 (GND).

Adjust Down:

Add a resistor (R1), between pin 14 (Vo

adjust) and pins 11-13 (Vout).

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

of the required resistor, either (R1) or R2 as appropriate.

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 adjust to either

GND, Vout, or the Remote Sense pin. Any

capacitance added to the Vo adjust pin will affect the

stability of the ISR.

3. If the Remote Sense feature is being used,

connecting the resistor (R1) between pin 14 (Vo

adjust) and pin 1 (Remote Sense) can benefit load

regulation.

4. The minimum input voltage required by the part is

Vout + 1.2 or Vin(min) from Table 1, whichever is

higher.

Figure 1

Vin

4,5,6

V in

Vo(sense)

PT6500

11,12,13

V out

STBY

GND

V o(adj)

7,8,9,10

(R1)

Adj Down

Adjust

COM

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

also be calculated using the following formulae.

(R1)

Ro (Va â 1.0)

(Vo â Va)

â Rs kâ¦

Va - Vo

â Rs

kâ¦

Where: Vo = Original output voltage

Va = Adjusted output voltage

Ro = The resistance value in Table 1

Rs = The series resistance from Table 1

Table 1

PT6500 ADJUSTMENT AND FORMULA PARAMETERS

Series Pt #

PT6505

PT6507

PT6502

Vo (nom)

1.2

1.3

1.5

Va (min)

1.14

1.19

1.27

Va (max)

2.35

2.45

2.65

Ro (kâ¦)

2.49

Rs (kâ¦)

2.0

Vin(min)

3.1

PT6508

1.7

1.36

2.85

2.49

2.0

3.1

PT6506

1.8

1.4

2.95

2.49

2.0

3.1

PT6503

2.5

1.8

3.5

4.99

4.22

4.5

PT6501

3.3

2.25

4.2

12.1

4.5

PT6504

3.6

2.5

4.3

10.0

12.1

4.5

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

▷