Hi,
I intend to drive a Peltier (Tellurex C2-40-1504) from a microcontroller (a 3.3V powered TI MSP430) using an opamp and a logic-level mosfet; with a low Vgs(th) of either 2.5V or 4.5V.
I'll be using a 2KHZ PWM signal from the MCU. However the peltier requires a PWM signal with below 10% ripple, so i'm targeting a 5% ripple. ( which should be about 0.05x3.3 = about 165mV p-p ripple, right ?)
The signal from the mcu is to be passed through an RC low-pass filter to achieve a near DC signal with the above 5% ripple, but.. i'm not sure of what RC values to use. Please any help here would be appreciated ?
I intend to amplifer the filtered signal to around 10V, so i was wondering what final voltage would be outputed after this RC filtering ?
thank you for any responses.
I intend to drive a Peltier (Tellurex C2-40-1504) from a microcontroller (a 3.3V powered TI MSP430) using an opamp and a logic-level mosfet; with a low Vgs(th) of either 2.5V or 4.5V.
I'll be using a 2KHZ PWM signal from the MCU. However the peltier requires a PWM signal with below 10% ripple, so i'm targeting a 5% ripple. ( which should be about 0.05x3.3 = about 165mV p-p ripple, right ?)
The signal from the mcu is to be passed through an RC low-pass filter to achieve a near DC signal with the above 5% ripple, but.. i'm not sure of what RC values to use. Please any help here would be appreciated ?
I intend to amplifer the filtered signal to around 10V, so i was wondering what final voltage would be outputed after this RC filtering ?
thank you for any responses.