SA55

PULSE WIDTH MODULATION AMPLIFIER SA55 M I C R O T E C H N O L O G Y HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739 PRELIMINARY FEATURES DELIVERS UP TO 5A CONTINUOUS OUTPUT OPERATES AT SUPPLY VOLTAGES TO 55V TTL AND CMOS COMPATIBLE INPUTS NO “SHOOT-THROUGH” CURRENT THERMAL WARNING FLAG OUTPUT AT 145° C THERMAL SHUTDOWN (OUTPUTS OFF) AT 160° C INTERNAL CLAMP DIODES SHORTED LOAD PROTECTION INTERNAL CHARGE PUMP WITH EXTERNAL BOOTSTRAP CAPABILITY APPLICATIONS DC AND STEPPER MOTOR DRIVES POSITION AND VELOCITY SERVOMECHANISMS FACTORY AUTOMATION ROBOTS NUMERICALLY CONTROLLED MACHINERY COMPUTER PRINTERS AND PLOTTERS DESCRIPTION The SA55 is a 5A H-Bridge designed for motion control applications. The device is built using a multi-technology process which combines bipolar and CMOS control circuitry with DMOS power devices on the same monolithic structure. Ideal for driving DC and stepper motors; the SA55 accomodates peak output currents up to 10A. An innovative circuit which facilitates low-loss sensing of the output current has been implemented. BLOCK DIAGRAM THERMAL FLAG OUTPUT BOOTSTRAP 1 VS BOOTSTRAP 2 THERMAL SENSING ILIM UNDER VOLTAGE LOCKOUT CHARGE PUMP DRIVE CURRENT SENSING CHARGE PUMP DRIVE OUTPUT 1 CURRENT SENSE OUT OUTPUT 2 PWM DIRECTION BRAKE BRIDGE DRIVER GROUND APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL [email protected] SA55 ABSOLUTE MAXI...