to drive dc motor using uln2003 - Electronic Circuits Projects Diagrams Free

maddy.dreams · 21st May 2008, 03:14 PM

hi..
i want to control i.e only to on n off a dc motor(walkman motor). its rating is 3-5v,500ma. i've left with only 2 ports(p1.5 n p1.6) of 89s52 uc.
plz give me the circuit diagram to drive motor using uln2003..

thanx in advance..
Madhav

audioguru · 21st May 2008, 07:44 PM

The TDA2003A has a max allowed collector current of 500mA when it operates poorly. Its max saturation voltage loss is 1.6V when its load current is only 350mA. Its max input voltage is 3.0V for only 300mA output.
Its output sinks towards 0V.

Boncuk · 22nd May 2008, 01:20 AM

The ULN2003A has a built in base resistor of 2K7. Use two inputs and outputs in parallel. For max possible saturation apply +5V directly to the inputs.

As audioguru already mentioned the voltage loss will be 1.6V (darlington), but still enough voltage to drive the motor.

Don't forget to connect the free wheeling diodes (pin9) to +5V. The motor is an inductive load.

There is no schematic necessary if you connect the motor like this: pins1 and 2 and 9 --> +5V (control input), first motor connection --> pins 15 and 16, second motor connection --> +5V

Gayan Soyza · 22nd May 2008, 07:15 AM

Quote:

Originally Posted by maddy.dreams

i've left with only 2 ports(p1.5 n p1.6) of 89s52 uc.plz give me the circuit diagram to drive motor using uln2003..

A bit doubt why he needs two pins to drive a motor unless he needs an H bridge to turn the motor on both directions from the two left pins.

Boncuk · 22nd May 2008, 09:29 AM

Quote:

Originally Posted by Gayan Soyza

A bit doubt why he needs two pins to drive a motor unless he needs an H bridge to turn the motor on both directions from the two left pins.

just because the ULN2003A has base resistors of 2K7 and won't saturate at 5V input voltage. Using two pairs of transistors the current flow might be high enough to drive the motor.

Using an ULN2001A there wouldn't be a problem. It has no base resistors built in.

Boncuk

petrv · 22nd May 2008, 04:18 PM

Why it must be ULN2003 ? Better use a H-Bridge like SN754410, for higher currents L298 or L6203 or LMD18200.

If you don't need directional control, just use a transistor (BJT NPN or N-MOSFET). Selection of the transistor
depends on the current your motor needs.

illiraj55 · 22nd May 2008, 05:58 PM

i want a fm&am radio signal receiver (hi power) receive all mhz for hoby purpose pls give circut diagram

petrv · 23rd May 2008, 06:15 AM

Suitable transistor for 0.5A motor: You can try for example BC337, better the 0.8A version (Fairchild, ON Semiconductor) the version from NXP is only 0.5A and better to have a reserve. BC639 can be also used if your micro can source at least 20 mA on the output pin as the min. hFE is only 25. MOSFET is also a good choice, there are "logic level" MOSFETs that they need only 5V gate voltage to fully open (many common MOSFETs need 10V). Selecting one with low Rds-on assures minimal losses and warming when the MOSFET is open. The smaller MOSFETs are usually SMD components but you can take a bigger one in TO-220 package - for example I have RFP3055LE - it is of course overkill (11A, 60V max.) but not expensive and smaller MOSFETs are not necessarily much cheaper (if at all) (see: Digi-Key Corporation - USA Home Page, Mouser Electronics - Electronic Component Distributor) or there is a similar product from ST: STP16NF06L ( only $ 0.51/piece at Mouser).

Gayan Soyza · 23rd May 2008, 06:27 AM

Hi petrv I use the above technic you described.

I think OP is driving displays (SSD) as well so he may take the ULN to drive the displays.The remaining ULN pins taking the advantage to drive the motor as well.This way the design makes compact.

I just guess but not sure until OP give a clear idea.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Title	Starter	Forum	Replies	Latest
can't drive my DC motor	bar_shay	Robotics Chat	10	29th October 2007 12:29 AM
ULN2003, zener diode and a stepper motor	dusko	Electronic Projects Design/Ideas/Reviews	2	7th August 2007 05:46 AM
Motor Drive	YAN-1	Electronic Projects Design/Ideas/Reviews	20	4th January 2007 06:48 AM
motor drive	zahra sultan	Robotics Chat	15	22nd March 2006 05:50 AM
Driver ULN2003 & L297 Stepper Motor	skyways	Datasheet/Parts Requests	3	7th January 2005 07:56 AM

21st May 2008, 03:14 PM	(permalink)
maddy.dreams	to drive dc motor using uln2003 hi.. i want to control i.e only to on n off a dc motor(walkman motor). its rating is 3-5v,500ma. i've left with only 2 ports(p1.5 n p1.6) of 89s52 uc. plz give me the circuit diagram to drive motor using uln2003.. thanx in advance.. Madhav

21st May 2008, 07:44 PM	(permalink)
audioguru	The TDA2003A has a max allowed collector current of 500mA when it operates poorly. Its max saturation voltage loss is 1.6V when its load current is only 350mA. Its max input voltage is 3.0V for only 300mA output. Its output sinks towards 0V. __________________ Uncle $crooge

22nd May 2008, 01:20 AM	(permalink)
Boncuk	The ULN2003A has a built in base resistor of 2K7. Use two inputs and outputs in parallel. For max possible saturation apply +5V directly to the inputs. As audioguru already mentioned the voltage loss will be 1.6V (darlington), but still enough voltage to drive the motor. Don't forget to connect the free wheeling diodes (pin9) to +5V. The motor is an inductive load. There is no schematic necessary if you connect the motor like this: pins1 and 2 and 9 --> +5V (control input), first motor connection --> pins 15 and 16, second motor connection --> +5V

22nd May 2008, 04:18 PM	(permalink)
petrv	Why it must be ULN2003 ? Better use a H-Bridge like SN754410, for higher currents L298 or L6203 or LMD18200. If you don't need directional control, just use a transistor (BJT NPN or N-MOSFET). Selection of the transistor depends on the current your motor needs. Last edited by petrv; 22nd May 2008 at 04:20 PM.

22nd May 2008, 05:58 PM	(permalink)
illiraj55	i want a fm&am radio signal receiver (hi power) receive all mhz for hoby purpose pls give circut diagram

23rd May 2008, 06:15 AM	(permalink)
petrv	Suitable transistor for 0.5A motor: You can try for example BC337, better the 0.8A version (Fairchild, ON Semiconductor) the version from NXP is only 0.5A and better to have a reserve. BC639 can be also used if your micro can source at least 20 mA on the output pin as the min. hFE is only 25. MOSFET is also a good choice, there are "logic level" MOSFETs that they need only 5V gate voltage to fully open (many common MOSFETs need 10V). Selecting one with low Rds-on assures minimal losses and warming when the MOSFET is open. The smaller MOSFETs are usually SMD components but you can take a bigger one in TO-220 package - for example I have RFP3055LE - it is of course overkill (11A, 60V max.) but not expensive and smaller MOSFETs are not necessarily much cheaper (if at all) (see: Digi-Key Corporation - USA Home Page, Mouser Electronics - Electronic Component Distributor) or there is a similar product from ST: STP16NF06L ( only $ 0.51/piece at Mouser).

23rd May 2008, 06:27 AM	(permalink)
Gayan Soyza	Hi petrv I use the above technic you described. I think OP is driving displays (SSD) as well so he may take the ULN to drive the displays.The remaining ULN pins taking the advantage to drive the motor as well.This way the design makes compact. I just guess but not sure until OP give a clear idea. __________________ Gayan My Website http://gsmicro.blogspot.com/