LMZ31710RVQT datasheet(11/33 Pages) TI1

部品番号	LMZ31710RVQT

部品情報	10A SIMPLE SWITCHER짰 Power Module with 2.95V-17V Input and Current Sharing in QFN Package

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LMZ31710

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SNVS987A – JULY 2013 – REVISED JULY 2013

APPLICATION INFORMATION

Adjusting the Output Voltage

The VADJ control sets the output voltage of the LMZ31710. The output voltage adjustment range is from 0.6V to

5.5V. The adjustment method requires the addition of RSET, which sets the output voltage, the connection of

SENSE+ to VOUT, and in some cases RRT which sets the switching frequency. The RSET resistor must be

connected directly between the VADJ (pin 26) and AGND (pin 23). The SENSE+ pin (pin 27) must be connected

to VOUT either at the load for improved regulation or at VOUT of the device. The RRT resistor must be connected

directly between the RT/CLK (pin 22) and AGND (pin 23). Table 3 gives the standard external RSET resistor for a

number of common bus voltages, along with the recommended RRT resistor for that output voltage.

Table 3. Standard RSET Resistor Values for Common Output Voltages

RESISTORS

OUTPUT VOLTAGE VOUT (V)

0.9

1.0

1.2

1.8

2.5

3.3

5.0

RSET (kΩ)

2.87

2.15

1.43

0.715

0.453

0.316

0.196

RRT (kΩ)

1000

487

169

90.9

63.4

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 4.

(1)

Table 4. Standard RSET Resistor Values

VOUT (V)

RSET (kΩ)

RRT(kΩ)

fSW(kHz)

VOUT (V)

RSET (kΩ)

RRT(kΩ)

fSW(kHz)

0.6

open

OPEN

200

3.1

0.348

90.9

750

0.7

8.66

OPEN

200

3.2

0.332

90.9

750

0.8

4.32

OPEN

200

3.3

0.316

90.9

750

0.9

2.87

1000

250

3.4

0.309

90.9

750

1.0

2.15

1000

250

3.5

0.294

90.9

750

1.1

1.74

1000

250

3.6

0.287

90.9

750

1.2

1.43

487

300

3.7

0.280

90.9

750

1.3

1.24

487

300

3.8

0.267

90.9

750

1.4

1.07

487

300

3.9

0.261

90.9

750

1.5

0.953

487

300

4.0

0.255

90.9

750

1.6

0.866

487

300

4.1

0.243

63.4

1000

1.7

0.787

487

300

4.2

0.237

63.4

1000

1.8

0.715

169

500

4.3

0.232

63.4

1000

1.9

0.665

169

500

4.4

0.226

63.4

1000

2.0

0.619

169

500

4.5

0.221

63.4

1000

2.1

0.576

169

500

4.6

0.215

63.4

1000

2.2

0.536

169

500

4.7

0.210

63.4

1000

2.3

0.511

169

500

4.8

0.205

63.4

1000

2.4

0.475

169

500

4.9

0.200

63.4

1000

2.5

0.453

90.9

750

5.0

0.196

63.4

1000

2.6

0.432

90.9

750

5.1

0.191

63.4

1000

2.7

0.412

90.9

750

5.2

0.187

63.4

1000

2.8

0.392

90.9

750

5.3

0.182

63.4

1000

2.9

0.374

90.9

750

5.4

0.178

63.4

1000

3.0

0.357

90.9

750

5.5

0.174

63.4

1000

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