Click here to ask an associate for production status of specific part numbers. Evaluates: MAX22205 MAX22205 Evaluation Kit General Description Features The MAX22205 evaluation kit (EV kit) provides a prov- Easy Evaluation of the MAX22205 en design to evaluate the +65V, 7.6A Single H-Bridge Adjustable t Time Using an On-Board OFF MAX22205 motor driver. The MAX22205 can drive a single Potentiometer brushed DC motor. The MAX22205 IC integrates very low Configurable Current Drive Regulation (CDR) impedance FETs in a single H-Bridge configuration with a typical R (high side + low side) of 0.15. The EV kit ON On-board +3.3V Regulator to Drive MAX22205 features headers, test points, and terminal blocks to provide Logic Inputs an interface to the MAX22205 motor driver. The MAX22205 Test Points and Headers to Interface with MAX22205 integrated current-sense output ISENA and ISENB can be Logic Inputs and Current-Sense Outputs monitored using test points or can be connected to an external ADC using header J3. The MAX22205 features Fully Assembled and Tested embedded current-drive regulation (CDR) with adjustable Proven PCB Layout chopping current (I ) and adjustable current-limit off- TRIP time (t ). The EV kit operates from an input voltage OFF Ordering Information appears at end of data sheet. of +4.5V to +65V (V ). An on board +3.3V regulator U2 M (MAX6765TTSD2+) provides a regulated +3.3V to supply the MAX22205 logic inputs. Terminal blocks J1, J5, and J6 are installed to provide an interface for the high voltage, high current V inputs and motor driver outputs OUT A M and OUT B. MAX22205 EV Kit Board Photo 319-100842 Rev 0 11/21 2021 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. One Analog Way, Wilmington, MA 01887 U.S.A. Tel: 781.329.4700 2021 Analog Devices, Inc. All rights reserved.MAX22205 Evaluation Kit Evaluates: MAX22205 Quick Start Detailed Description of Hardware Required Equipment Enable Controls MAX22205 EV kit The MAX22205s Enable pin (EN) can be configured by installing or uninstalling a shunt on header J19 or the EN +65V DC, 7.6A power supply pin can be controlled by an external signal by uninstalling 100kHz square-wave generator (optional) the shunt on J19 and driving the pin directly by applying a Brushed DC motor or load signal to pin 3 of header J3. Procedure On-Board +3.3V Control The EV kit is fully assembled and tested. Use the follow- The MAX22205 features an on-board +3.3V LDO that ing steps to verify board operation: operates from +4.5V to +65V. The input voltage to the LDO is supplied by the V voltage. To provide 3.3V 1) As with all motor drive applications, stopping or M to the MAX22205 logic pins from the LDO, install a braking the motor can cause a back EMF (BEMF) shunt in positions 23 of header J18. An external +3.3V current and voltage spike. At high supply voltages supply can be used, which can be connected to TP3, and (+65V), this can cause the supply to rise above the in this case, a shunt should be installed in positions 12 absolute maximum allowable voltage to the supply of header J18. pins of a motor drive IC. It is highly recommended that the power supply be clamped appropriately to avoid PWM Controls damage to the motor driver IC. When the part is Enabled (EN = Logic High) and the 2) Verify that shunts are installed in the default position. H-Bridge current is below the configured current limit, the 3) Connect a +65V supply to V and adjust the V volt- average output voltage can be controlled by DINA and M M age to the desired operating voltage. DINB logic input pins using PWM techniques. Setting Enable logic low causes the output to enter a high imped- 4) Adjust the I chopping current according to the TRIP ance mode and the motor to coast. The Enable input pin position of shunts on header J2 to accommodate the frequency must not exceed 1KHz and cannot be used for load requirement. PWM control. Table 1 describes the behavior of the full 5) Adjust the t time using potentiometer R9 if the off- OFF H-Bridge output pins OUT A and OUT B with respect to time is being observed. the input signals EN, DINA, and DINB. 6) Apply a PWM signal to the DINA/DINB inputs as Current Regulation Controls desired to drive the load. For example, a +3.3V to The MAX22205 features embedded current drive regu- 0V, 20kHz PWM signal with a 20% duty cycle can be used to drive a 24V or 48V brushed DC motor lation (CDR). The bridge current is sensed by a non- connected to the outputs. To drive a load with dissipative integrated current-sensing circuit (ICS) and it is current flowing from OUT A to OUT B, the PWM then compared with the threshold current (I ). As soon TRIP signal should be applied to DINA and DINB should be as the bridge current exceeds the threshold, the device driven to logic low (GND). enforces the decay for a fixed OFF-time (t ). Once OFF t has elapsed, the driver is re-enabled for the next OFF PWM cycle. t can be adjusted by connecting a resistor OFF (R ) from the ROFF pin to GND. Potentiometer R9 ROFF Table 1. Full Bridge EN, DINA, DINB, OUT A, OUT B Truth Table EN DINA DINB OUT1A = OUT2A OUT1B = OUT2B DESCRIPTION 0 X X High-Z High-Z H-bridge disabled. High impedance (High-Z) 1 0 0 L L Brake Low Slow decay 1 1 0 H L Current from OUT A to OUT B 1 0 1 L H Current from OUT B to OUT A 1 1 1 H H Brake High Slow decay Analog Devices 2 www.analog.com