TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM)

The LTC6992 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, RSET, programs the LTC6992’s internal master oscillator frequency. The output frequency is determined by this master oscillator and an internal frequency divider, NDIV, programmable to eight settings from 1 to 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.

Applications

* PWM Servo Loops

* Heater Control

* LED Dimming Control

* High Vibration, High Acceleration Environments

* Portable and Battery-Powered Equipment

* Pulse Width Modulation (PWM) Controlled by Simple 0V to 1V Analog Input

* Four Available Options Define Duty Cycle Limits

* Minimum Duty Cycle at 0% or 5%

* Maximum Duty Cycle at 95% or 100%

* Frequency Range: 3.81Hz to 1MHz

* Configured with 1 to 3 Resistors

* <1.7% Maximum Frequency Error

* PWM Duty Cycle Error < 3.7% Maximum