Hello,
Hi, i'm working on a small project to operate two separate micro-pumps ( these kind: https://www.biochemfluidics.com/cart/store/comersus_listItems.asp?idCategory=85&Cur= ) via the MSP430F6338 using PWM.
Each pump is rated 12V, 320mA (.i.e. 4W ), and operate by PWM (with a max. cycle rate of 2Hz). It's maximum current was not stated in the specsheet, so i'm assuming the 320mA given would be it's holding current.
I'm using a MSP430F6638 controller whose pins are connected to two separate inputs of the ULN2803A darlington array transistor (it's peak output current on one pin is 500mA), the transistor does the switching via PWM from the controller.
I intend to power the pumps with an LDO ( http://www.linear.com/product/LT3029 ) , i figured that since the outputs of the LDO are adjustable, i should be able to get 12V at 320mA from them with V(in) coming from a 12Vdc wall-plugin
( or alternatively just put a 36ohms resistor in series with the solenoid to achieve the 320mA .i.e 12V / 36oms = ~333mA)
I wanted to clarify if this above configurations are valid ??
Thanks for replies in advance.
Hi, i'm working on a small project to operate two separate micro-pumps ( these kind: https://www.biochemfluidics.com/cart/store/comersus_listItems.asp?idCategory=85&Cur= ) via the MSP430F6338 using PWM.
Each pump is rated 12V, 320mA (.i.e. 4W ), and operate by PWM (with a max. cycle rate of 2Hz). It's maximum current was not stated in the specsheet, so i'm assuming the 320mA given would be it's holding current.
I'm using a MSP430F6638 controller whose pins are connected to two separate inputs of the ULN2803A darlington array transistor (it's peak output current on one pin is 500mA), the transistor does the switching via PWM from the controller.
I intend to power the pumps with an LDO ( http://www.linear.com/product/LT3029 ) , i figured that since the outputs of the LDO are adjustable, i should be able to get 12V at 320mA from them with V(in) coming from a 12Vdc wall-plugin
( or alternatively just put a 36ohms resistor in series with the solenoid to achieve the 320mA .i.e 12V / 36oms = ~333mA)
I wanted to clarify if this above configurations are valid ??
Thanks for replies in advance.