EVAL6206N STMicroelectronics

AN1762 APPLICATION NOTE L6205, L6206, L6207 DUAL FULL BRIDGE DRIVERS by Vincenzo Marano Modern motion control applications need more flexibility that can be addressed only with specialized IC products. The L6205, L6206, L6207 are dual full bridge drivers ICs specifically developed to drive a wide range of motors. These ICs are one-chip cost effective solutions that include several unique circuit design features. These features allow the devices to be used in many applications including DC and stepper motor driving. The principal aim of this development project was to produce easy to use, fully protected power ICs. In addition several key functions such as protection circuit and PWM current control drastically reduce exter- nal components count to meet requirements for many different applications. 1 INTRODUCTION The L6205, L6206, L6207 are highly integrated, mixed-signal power ICs that allow the user to easily design a control system for two-phase bipolar stepper motors, multiple DC motors and a wide range of inductive loads. Figure 1 to Figure 3 show the L6205, L6206, L6207 block diagrams. Each IC integrates eight Power DMOS plus other added features for safe operation and flexibility. The L6207 also features a constant t PWM current OFF control technique (Synchronous mode) for each of the two full bridges. Figure 1. L6205 block diagram. VBOOT V BOOT VS A V V BOOT BOOT CHARGE VCP PUMP OVER OCD CURRENT A DETECTION OUT1 A OUT2 A 10V 10V THERMAL PROTECTION EN GATE A LOGIC IN1 A SENSE A IN2 A 10V VOLTAGE REGULATOR 5V BRIDGE A OVER CURRENT VS OCD B DETECTION B OUT1 B OUT2 GATE B EN B LOGIC SENSE B IN1 B IN2 BRIDGE B B D99IN1091A December 2003 1/53AN1762 APPLICATION NOTE Figure 2. L6206 block diagram. VBOOT V BOOT VS A V V BOOT BOOT CHARGE VCP PUMP PROGCL A OVER OCD OCD CURRENT A A DETECTION OUT1 A OUT2 A 10V 10V THERMAL PROTECTION EN GATE A LOGIC IN1 A SENSE A IN2 A 10V VOLTAGE REGULATOR 5V BRIDGE A OCD B OVER OCD CURRENT B DETECTION VS B PROGCL B OUT1 B OUT2 GATE B EN B LOGIC SENSE B IN1 B IN2 BRIDGE B B D99IN1088A Figure 3. L6207 block diagram. VBOOT V BOOT VS A V V BOOT BOOT CHARGE VCP PUMP OVER OCD A CURRENT DETECTION OUT1 A OUT2 A 10V 10V THERMAL PROTECTION EN GATE A LOGIC IN1 A SENSE A IN2 A PWM VOLTAGE REGULATOR + ONE SHOT MASKING MONOSTABLE TIME VREF SENSE - A COMPARATOR 10V 5V RC A BRIDGE A VS B OVER OUT1 CURRENT B OCD B DETECTION OUT2 B SENSE B GATE VREF EN B B LOGIC IN1 RC B B IN2 BRIDGE B B D99IN1085A 2/53