LTC6992IS6-1-WTRMPBF View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

LTC6992IS6-1-WTRMPBF

TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM)

Analog Devices 

LTC6992-1/LTC6992-2/

LTC6992-3/LTC6992-4

TYPICAL APPLICATIONS

Changing Between Two Frequencies

ANALOG PWM

DUTY CYCLE CONTROL

(0V TO 1V)

MOD OUT

LTC6992-X

V+

GND

V+

fMAX

fMIN

RVCO

SET

DIV

RSET

‘HC04

0.1µF

V+

R1

R2

ANALOG PWM

DUTY CYCLE CONTROL

(0V TO 1V)

MOD OUT

LTC6992-X

GND

V+

V+

fMIN

SET

DIV

RSET2 RSET1

0.1µF

V+

R1

R2

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.

fMAX

‘HC04

2N7002

6992 TA05

NOTES

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

2.

3.

WHEN THE

V+ SUPPLY

NMOSFET IS ON, THE FREQUENCY IS

VARIATION IS NOT A FACTOR AS THE

SET BY RSET = RSET1 || RSET2.

SWITCHING RESISTOR IS

EITHER FLOATING OR CONNECTED TO GROUND.

Simple Diode Temperature Sensor

5V

R6

45.3k

R7

16.9k

D1

1N458

R8

84.5k

5V 0.1µF

–

+

LT6003

+10mV/C

MOD OUT

LTC6992-2

GND

V+

SET

R1

130k

DIV

6992 TA06

R9

365Ω

R4

1000k

R5

186k

5V

0.1µF

MOC207M

D3

5V

0.1µF

Q1

R11

422Ω

OUTPUT

C1

1µF

R2

50k

ADJUST FOR 50% DUTY CYCLE AT 25°C R3

130k

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%)

Rev. D

26

For more information www.analog.com

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