LTC6930 datasheet(26/34 Pages) AD

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LTC6992-1/LTC6992-2/

LTC6992-3/LTC6992-4

Rev. D

For more information www.analog.com

TYPICAL APPLICATIONS

Changing Between Two Frequencies

6992 TA05

LTC6992-X

MOD

GND

SET

OUT

V+

DIV

0.1µF

RSET

V+

NOTES

WHILE THIS CIRCUIT IS SIMPLER THAN THE CIRCUIT TO THE RIGHT,

ITS FREQUENCY ACCURACY IS WORSE DUE TO THE EFFECT OF

V+ SUPPLY VARIATION FROM SYSTEM TO SYSTEM AND OVER TEMPERATURE.

NOTES

1. WHEN THE NMOSFET IS OFF, THE FREQUENCY IS SET BY RSET = RSET1.

2. WHEN THE NMOSFET IS ON, THE FREQUENCY IS SET BY RSET = RSET1 || RSET2.

3. V+ SUPPLY VARIATION IS NOT A FACTOR AS THE SWITCHING RESISTOR IS

EITHER FLOATING OR CONNECTED TO GROUND.

RVCO

V+

‘HC04

fMAX

fMIN

ANALOG PWM

DUTY CYCLE CONTROL

(0V TO 1V)

LTC6992-X

MOD

GND

SET

OUT

V+

DIV

RSET1

RSET2

V+

ANALOG PWM

DUTY CYCLE CONTROL

(0V TO 1V)

V+

‘HC04

2N7002

fMIN

fMAX

Simple Diode Temperature Sensor

6992 TA06

LTC6992-2

MOD

GND

SET

OUT

V+

DIV

1000k

MOC207M

OUTPUT

1µF

186k

0.1µF

LT6003

+10mV/C

130k

50k

130k

ADJUST FOR 50% DUTY CYCLE AT 25°C

16.9k

84.5k

45.3k

1N458

R11

422Ω

NDIV = 16

f = 10kHz

PWM OUTPUT FOR ISOLATED MEASUREMENT

+1% DUTY CYCLE CHANGE PER DEGREE C

–10°C TO 65°C RANGE WITH OPTO-ISOLATOR (DC: 15% TO 95%)

365Ω

0.1µF

LTC6930 Datasheet(PDF) 26 Page - Analog Devices

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