Linear Technology LTC6992-3: 0-95% Duty Cycle DC1562B-E DC1562B-E 数据表

LTC6992-1/LTC6992-2/

LTC6992-3/LTC6992-4

1

69921234fc

TimerBlox: 

Voltage-Controlled Pulse 

Width Modulator (PWM)

The LTC

®

6992 is a silicon oscillator with an easy-to-use 

analog voltage-controlled pulse width modulation (PWM) 

capability. The LTC6992 is part of the TimerBlox

®

 family 

of versatile silicon timing devices.
A single resistor, R

SET

, programs the LTC6992’s inter-

nal master oscillator frequency. The output frequency 

is determined by this master oscillator and an internal 

frequency divider, N

DIV

, programmable to eight settings 

from 1 to 16384.

 

 

f

OUT

=

1MHz

N

DIV

•

50k

Ω

R

SET

, N

DIV

= 1,4,16 …16384

Applying a voltage between 0V and 1V on the MOD pin 

sets the duty cycle.
The four versions differ in their minimum/maximum duty 

cycle. Note that a minimum duty cycle limit of 0% or 

maximum duty cycle limit of 100% allows oscillations to 

stop at the extreme duty cycle settings.

LTC6992-1

0% to 100%

LTC6992-2

5% to 95%

LTC6992-3

0% to 95%

LTC6992-4

5% to 100%

For easy configuration of the LTC6992, download the 

TimerBlox Designer tool at 

n

  Pulse Width Modulation (PWM) Controlled by 

n

  Four Available Options Define Duty Cycle Limits

 – Minimum Duty Cycle at 0% or 5%

 – Maximum Duty Cycle at 95% or 100%

n

  Frequency Range: 3.81Hz to 1MHz

n

  Configured with 1 to 3 Resistors

n

  <1.7% Maximum Frequency Error

n

  PWM Duty Cycle Error < 3.7% Maximum

n

  Frequency Modulation (VCO) Capability

n

  2.25V to 5.5V Single Supply Operation

n

  115μA Supply Current at 100kHz

n

  500μs Start-Up Time

n

  CMOS Output Driver Sources/Sinks 20mA

n

  –55°C to 125°C Operating Temperature Range

n

  Available in Low Profile (1mm) SOT-23 (ThinSOT™) 

and 2mm 

× 3mm DFN

L

, LT, LTC and  LTM, Linear Technology, TimerBlox and the Linear logo are registered 

trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks 

are the property of their respective owners.

n

  PWM Servo Loops

n

  Heater Control

n

  LED Dimming Control

n

  High Vibration, High Acceleration Environments

n

  Portable and Battery-Powered Equipment

6992 TA01a

LTC6992

MOD

GND

SET

OUT

V

+

DIV

R

SET

50k

3.3V

ANALOG PWM

DUTY CYCLE

CONTROL

(0V TO 1V)

C1

0.1µF

MOD

0.5V/DIV

OUT

1V/DIV

2µs/DIV

6992 TA01b