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BA6438 Scheda tecnica(PDF) 6 Page - Rohm |
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BA6438 Scheda tecnica(HTML) 6 Page - Rohm |
6 / 8 page BA6438S Motor driver ICs !Application example 10 9 8 7 6 5 4 2 1 3 23 24 19 11 H1+ Hall Hall Hall 0.033 µF Torque control signal 0.033 µF 0.1 µF 0.1 µF ATC Motor direction control signal VCC EC ECR AGC Short-circuit detection TSD Signal power supply VCC VM A1 A2 REG Motor power supply 20 22 18 21 470PF Switching regulator Oscil- lator Output saturation detector OSC VS 14 13 15 12 16 17 GND TL CS PCI Motor direction detection PCV Ripple cancellation H3− H3+ H2− H2+ H1− Hall amp VCC Output saturation prevention Motor direction setting A3 ED / S PCH 0.5 Ω Fig. 8 !Operation notes The BA6438S has two thermal shutdown circuits (TSD1 and TSD2) to protect the IC. The typical shutdown tem- peratures are 175 °C for TSD1 and 215°C for TSD 2. When the TSD1 is activated at an elevated chip tempera- ture, the output pins (pins 1, 3, and 23) are set to the open state. TSD1 is functional against excessive power dis- sipation, output short-circuiting, and other irregularities in the output current, but does not work against overheating caused by high internal currents due to externally caused IC damage or pin-to-pin short-circuiting. When TSD2 is activated at a higher chip temperature, the high-and low-side output transistors are turned on, and the internal resistance between the motor power supply pin (pin 24) and the output ground pin (pin 2) drops to less than 3 Ω. The motor power supply current (IM) is then giv- en by IM = VM [V] RM+R2P+3 [Ω] where IM is the motor supply current, VM is the motor supply voltage, RM is the motor power supply output resistance, R2P is the pin-2 resistance. In your application, make sure to connect between the motor power supply and pin 24 a circuit breaker that operates at currents less than IM . |
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