Click here to ask about the production status of specific part numbers. Evaluates: MAX22201 MAX22201 Evaluation Kit General Description Features The MAX22201 evaluation kit (EV kit) provides a proven Easy Evaluation of the MAX22201 design to evaluate the MAX22201 brushed DC motor Configurable for External PWM or Adjustable driver. The MAX22201 IC integrates very low impedance On-Board PWM Input FETs in a full bridge configuration for use in 36V, 3.5A Configurable RILIM Resistor to Adjust Integrated motor driver applications. The typical RON (high side + Current Limit Threshold low side) of this configuration is 0.3. The EV kit features headers, test points, and terminal blocks to provide an Configurable ROFF Resistor to Adjust OFF Time interface to the MAX22201 motor driver PWM inputs, cur- Fully Assembled and Tested rent sense outputs, and power supply inputs and motor Proven PCB Layout driver outputs. An on-board ICM7556 provides an on- board PWM generator with a fixed frequency of 16.5kHz and an adjustable duty cycle from 4% to 95%. The EV kit also allows the user to adjust the integrated current limit- Ordering Information appears at end of data sheet. ing using an on-board potentiometer. MAX22201 EV Kit Board Figure 1. MAX22201 EV Kit Board 319-100672 Rev 0 1/21Evaluates: MAX22201 MAX22201 Evaluation Kit Example Startup Procedure Quick Start The steps below describe the startup procedure using the Required Equipment on-board PWM signal to drive the MAX22201 inputs. MAX22201 EV kit 1) Verify that all shunts are installed as described in +36V DC, 5A power supply step 2 of the quick start procedure. This brings the Optional up to 100kHz square wave signal generator part up in low-power sleep mode. Brushed DC motor or load 2) Move the shunts to position 1-2 on J5 and J9. This exits the low-power sleep mode. Procedure 3) To drive a motor connected to the output forward in It is recommended that the engineer read the MAX22201 continuous mode, move the shunt on J9 to position IC data sheet prior to using the EV kit. Refer to the Typical 2-3. This drives the DC motor in forward mode with Application Circuits and Detailed Description in the IN1 = logic high and IN2 logic low. Return the shunt MAX22201 IC data sheet for more information. The EV on J9 to position 1-2 to enter brake mode. kit is fully assembled and tested. Use the following steps 4) To drive a motor connected to the output forward to verify board operation: with PWM control, move the shunt on J9 so that it 1) As with all motor drive applications, stopping or brak- can be installed across pin1 of J6 and pin 2 of J9. ing the motor can cause a back EMF (BEMF) current This drives the DC motor in forward with the on- and voltage spike. At high supply voltages (+36V), board PWM signal. The PWM signal duty cycle can this can cause the supply to rise above the absolute be adjusted using R13. Return the shunt on J9 to maximum allowable voltage to the supply pins of a position 1-2 to enter brake mode. motor drive IC. It is highly recommended that the 5) To drive a motor connected to the output reverse in power supply be clamped appropriately to avoid continuous mode, move the shunt on J5 to position damage to the motor driver IC. 2-3. This drives the DC motor in reverse mode with 2) Verify that all shunts are installed in their default IN1 = logic low and IN2 logic high. Return the shunt position as described in Table 2. on J5 to position 1-2 to enter brake mode. 3) Adjust the current limit threshold using potentiometer 6) To drive a motor connected to the output reverse R4 and reading the resistance using test point TP4 with PWM control, move the shunt on J5 so that it and a GND test point. can be installed across pin1 of J6 and Pin 2 of J5. 4) If a load or DC motor is being used, connect the load This drives the DC motor in reverse with the on- or motor to terminal block J4. board PWM signal. The PWM signal duty cycle can be adjusted using R13. Return the shunt on J5 to 5) Connect a +4V to +36V DC power supply to the position 1-2 to enter brake mode. terminal block J1 or TP13 and TP14 and turn on the supply. Detailed Description of Hardware 6) If the part is started with IN1 and IN2 at a logic-low (or Software) state, the part enters a low-power sleep mode. To power on the device, both inputs IN1 and IN2 must The MAX22201 EV kit provides a proven layout and first be driven to a logic-high state for at least 400s. evaluation circuit for the MAX22201 (U1) IC. The EV kit features a MAX15006 (U2) ultra-low quiescent current 7) Pin 2 of headers J5 and J9 or TP1 (IN1) and TP2 LDO to provide +3.3V from an input voltage of +4V to (IN2) can be used to drive the MAX22201 PWM +36V from the VM supply to power the on-board PWM inputs. To drive IN1 or IN2 high continuously, use switching circuitry. On-board PWM switching is achieved shunts on headers J5 and J9. To Drive IN1 or IN2 using an ICM7556 (U3) dual timer IC and can be routed with the on-board PWM signal, use pin 2 of either to either IN1 or IN2 input of the MAX22201. header J5 or J9 and pin 1 of J6. See the Example Startup Procedure section for an example of a startup sequence and Table 2 for more information. Maxim Integrated 2 www.maximintegrated.com