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L6229PDTR Datasheet(PDF) 9 Page - STMicroelectronics |
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L6229PDTR Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 25 page 9/25 L6229 Figure 7. Logic Input Internal Structure Figure 8. Pin EN Open Collector Driving Figure 9. Pin EN Push-Pull Driving 3.3 PWM CURRENT CONTROL The L6229 includes a constant off time PWM Current Controller. The current control circuit senses the bridge current by sensing the voltage drop across an external sense resistor connected between the source of the three lower power MOS transistors and ground, as shown in Figure 10. As the current in the motor increases the voltage across the sense resistor increases proportionally. When the voltage drop across the sense resistor becomes greater than the voltage at the reference input pin VREF the sense comparator triggers the monostable switching the bridge off. The power MOS remain off for the time set by the monostable and the mo- tor current recirculates around the upper half of the bridge in Slow Decay Mode as described in the next section. When the monostable times out, the bridge will again turn on. Since the internal dead time, used to prevent cross conduction in the bridge, delays the turn on of the power MOS, the effective Off Time tOFF is the sum of the monostable time plus the dead time. Figure 11 shows the typical operating waveforms of the output current, the voltage drop across the sensing re- sistor, the pin RC voltage and the status of the bridge. More details regarding the Synchronous Rectification and the output stage configuration are included in the next section. Immediately after the Power MOS turn on, a high peak current flows through the sense resistor due to the re- 5V D01IN1329 ESD PROTECTION 5V 5V OPEN COLLECTOR OUTPUT REN CEN EN DIAG D02IN1378 ESD PROTECTION 5V PUSH-PULL OUTPUT REN CEN EN D02IN1379 DIAG ESD PROTECTION |
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