PTH04T240FAST datasheet(9/35 Pages) TI

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APPLICATION INFORMATION

ADJUSTING THE OUTPUT VOLTAGE

SET + 10 kW

0.69

O * 0.69

* 1.43 kW

(1)

+Sense

-Sense

OAdj

PTH04T240F

SET

0.05 W

+Sense

-Sense

GND

UDG-08159

GND

PTH04T240F

www.ti.com ............................................................................................................................................... SLTS293A – DECEMBER 2008 – REVISED MARCH 2009

The VOAdjust control (pin 8) sets the output voltage of the PTH04T240F. The adjustment range is between 0.69

V and 2.0 V. The adjustment method requires the addition of a single external resistor, RSET, that must be

connected directly between the VOAdjust and – Sense pins. Table 1 gives the standard value of the external

resistor for a number of standard voltages, along with the actual output voltage that this resistance value

provides.

For other output voltages, the value of the required resistor can either be calculated using the following formula,

or simply selected from the range of values given in Table 2. Figure 9 shows the placement of the required

resistor.

Table 1. Standard Values of RSET for Standard Output Voltages

VO (Standard) (V)

RSET (Standard Value) (kΩ)

VO (Actual) (V)

2.0 (1)

3.83

2.002

1.8 (1)

4.75

1.807

1.5 (1)

6.98

1.510

1.2

12.1

1.200

20.5

1.004

0.7

681

0.700

(1)

The minimum input voltage is 2.2 V or (VO + 0.5) V, whichever is greater.

(1)

RSET: Use a 0.05 W resistor with a tolerance of 1% and temperature stability of 100 ppm/°C (or better). Connect the

resistor directly between VOAdjust (pin 8) and -Sense (pin 7), as close to the regulator as possible, using dedicated

PCB traces.

(2)

Never connect capacitors from VOAdjust (pin 8) to either +Sense (pin 6), GND, or VO (pin 5). Any capacitance added

to the VOAdjust pin affects the stability of the regulator.

Figure 9. VO Adjust Resistor Placement

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