Maxim公司的MAX22203是集成電流檢測的65V 3.8A兩路有刷馬達和單個步進馬達驅動器,具有PWM輸入和精確的電流驅動調節(CDR).每個H橋可單獨地控制,有非常低的RON(高邊+低邊)0.3Ω(TA = 25C),導致了高驅動效率和產生低熱量.MAX22203可用來驅動兩個有刷DC馬達或單個步進馬達.器件具有過流保護(OCP),熱關斷(TSD)和欠壓鎖住(UVLO).開路漏極作用低nFAULT引腳,每次起作用時用作故障條件檢測.在熱關斷和欠壓鎖住時,驅動器處與三態直到正常工作條件恢復.兩個H橋具有65V最大工作電壓.器件采用TQFN38 5mm x 7mm封裝.主要用在有刷DC馬達驅動,步進馬達驅動,螺線管驅動器以及鎖緊閥.本文介紹了MAX22203主要優勢和特性,簡化框圖和應用框圖以及評估板MAX22203 EVK主要特性,電路圖,材料清單和PCB設計圖.
The MAX22203 is a dual 65V, 3.8AMAX H-Bridge withPWM inputs and accurate Current Drive Regulation(CDR). Each H-Bridge can be controlled individually andhas a very low typical RON (high-side + low-side) of 0.3Ω,resulting in high driving efficiency and low heat generation.
The MAX22203 can be used to drive two Brushed DC motorsor a single Stepper Motor.
The integrated CDR can limit the start up or stall the currentof a Brushed DC motor or control the phase currentfor stepper operation.
The bridge output current is sensed by a non-dissipativeIntegrated Current Sensing (ICS) eliminating the bulky externalpower resistors (which are normally required for thisfunction) and compared with a configurable threshold current(ITRIP). The ITRIP threshold can be set independentlyfor the two full bridges by connecting the external resistorsto pins REFA and REFB .
The maximum output current per H-Bridge is IMAX = 3.8Aand is limited by the Overcurrent Protection (OCP) circuit.This current can be driven for very short transients andis aimed to effectively drive small capacitive loads. Themaximum user-configurable current regulation threshold isITRIP_MAX = 3A. The maximum RMS current (IRMS) per
H-Bridge is 2ARMS on a standard JEDEC 4-layer board.
The maximum RMS current can be limited by thermal considerationsand depends on the thermal characteristic ofthe application (PCB ground planes, heat sinks, forced airventilation, etc).
The MAX22203 features Overcurrent Protection (OCP),Thermal Shutdown (TSD), and Undervoltage Lockout(UVLO). An open-drain active low nFAULT pin is activatedevery time a fault condition is detected. During ThermalShutdown and Undervoltage Lockout, the driver is tristateduntil normal operations are restored.
The MAX22203 is packaged into a small TQFN38 5mm x7mm package.
MAX22203主要優勢和特性:
● Two H-Bridges with 65V Maximum Operating Voltage
• Total RON (High-Side + Low-Side): 300mΩ typical(TA = 25C)
● Current Ratings Per H-Bridge (Typical at 25C):
• IMAX = 3.8A (Impulsive Current for DrivingCapacitive Loads)
• ITRIP_MAX = 3A (Maximum Current Setting forInternal Current Drive Regulation)
• IRMS = 2ARMS
● Integrated Current Drive Regulation (CDR)
• Internal Current Sensing (ICS) Eliminates ExternalBulky Resistors and Improves Efficiency
• Current Drive Regulation Monitor Output Pins(CDRA and CDRB)
• Multiple Decay Modes (Slow, Mixed, Fast)
• Fixed Off Time Configurable with ExternalResistance.
● Current-Sense Output (Current Monitor)
● Fault Indicator Pin (FAULT)
● Protections
• Overcurrent Protection for Each Individual Channel(OCP)
• Undervoltage Lockout (UVLO)
• Thermal Shutdown (TSD) TJ = +165C
● TQFN38 5mm x 7mm package (TSSOP38 4.4mm x9.7mm available in the future)
MAX22203應用:
● Brushed DC Motor Driver
● Stepper Motor Driver
● Solenoid Driver
● Latched Valves
圖1.MAX22203簡化框圖
圖2.MAX22203應用框圖
評估板MAX22203 EVK
The MAX22203 evaluation kit (EV kit) provides a proven design to evaluate the +65V, 3.8A Dual H-Bridge MAX22203 motor driver. The MAX22203 can drive two brushed DC motors or single stepper motor. The MAX22203 IC integrates very low impedance FETs in a dual H-Bridge configuration with a typical RON (high side + low side) of 0.3Ω. The EV kit features headers, test points, and terminal blocks to provide an interface to the MAX22203 motor driver. The MAX22203 integrated current-sense output ISENA and ISENB can be monitored using test points or can be connected to an external ADC using header J4. The MAX22203 features embedded current-drive regulation (CDR) with adjustable chopping current (ITRIP) and adjustable current-limit off-time (tOFF). The MAX22203 EV kit operates from an input voltage of +4.5V to +65V (VM). An on board +3.3V regulator U2 (MAX6765TTSD2+) provides a regulated +3.3V to drive the MAX22203 logic inputs. Terminal blocks J1 and J6 are installed to provide an interface for the high voltage, high current VM inputs and motor driver outputs OUT1_ and OUT2_
評估板MAX22203 EVK主要特性:
Easy Evaluation of the MAX22203
Adjustable tOFFTime Using an On-Board Potentiometer
Configurable Current Drive Regulation (CDR)
On-board +3.3V Regulator to Drive MAX22203 Logic Inputs
Test Points and Headers to Interface with MAX22203 Logic Inputs and Current-Sense Outputs
Fully Assembled and Tested
Proven PCB Layout
圖3.評估板MAX22203 EVK外形圖
圖4.評估板MAX22203 EVK電路圖
評估板MAX22203 EVK材料清單:
圖5.評估板MAX22203 EVK PCB設計圖:頂層絲印
圖6.評估板MAX22203 EVK PCB設計圖:頂層
圖7.評估板MAX22203 EVK PCB設計圖:層2
圖8.評估板MAX22203 EVK PCB設計圖:層3
圖9.評估板MAX22203 EVK PCB設計圖:底層 |
