PTH04T221WAZ datasheet(11/39 Pages) TI

No. de pieza	PTH04T221WAZ

Descripción Electrónicos	16-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS

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Fabricante Electrónico	TI [Texas Instruments]

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APPLICATION INFORMATION

ADJUSTING THE OUTPUT VOLTAGE

R

SET + 10 kW

0.69

V

O * 0.69

* 1.43 kW

(1)

UDG−06043

RSET

1%

0.05 W

VO

+Sense

−Sense

GND

PTH04T220W/221W

2,3

5

4

6

7

+Sense

−Sense

GND

VO

VOAdj

PTH04T220W, PTH04T221W

SLTS275A – DECEMBER 2006 – REVISED FEBRUARY 2007

The Vo Adjust control (pin 7) sets the output voltage of the PTH04T220/221W. The adjustment range is 0.69 V

to 3.6 V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected

directly between the Vo Adjust 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 11 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)

3.3 (1)

1.21

3.304

2.5 (1)

2.37

2.506

1.8 (1)

4.75

1.807

1.5 (1)

6.98

1.510

1.2

12.1

1.200

1

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 7) and -Sense (pin 6), as close to the regulator as possible, using dedicated

PCB traces.

(2)

Never connect capacitors from VO Adjust (pin 7) to either +Sense (pin 5), GND, or VO (pin 4). Any capacitance

added to the VO Adjust pin affects the stability of the regulator.

Figure 11. VO Adjust Resistor Placement

11

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