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Q67007-A9274 Datasheet(PDF) 6 Page - Siemens Semiconductor Group |
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Q67007-A9274 Datasheet(HTML) 6 Page - Siemens Semiconductor Group |
6 / 17 page BTS 771 G Semiconductor Group 6 1999-01-07 Circuit Description Input Circuit The control inputs GH1,2 consist of TTL/CMOS compatible Schmitt-Triggers with hysteresis. Buffer amplifiers are driven by these stages and convert the logic signal into the necessary form for driving the power output stages. The inputs GH1 and GH2 are connected to a standard N-channel logic level power-MOS gate. Output Stages The output stages consist of an ultra low R DS ON Power-MOS H-Bridge. Protective circuits make the outputs short circuit proof to ground and load short circuit proof. Positive and negative voltage spikes, which occur when driving inductive loads, are limited by integrated power clamp diodes. Short Circuit Protection (valid only for the high-side switches) The outputs are protected against – output short circuit to ground, and – overload (load short circuit). An internal OP-Amp controls the Drain-Source-Voltage of the HS-Switches by comparing the DS-Voltage-Drop with an internal reference voltage. Above this trippoint the OP-Amp reduces the output current depending on the junction temperature and the drop voltage. In the case of overloaded high-side switches the status output is set to low. If the HS-Switches are in OFF-state-Condition internal resistors R O1,2 from SH1,2 to GND pull the voltage at SH1,2 to low values. On each output pin SH1 and SH2 an output examiner circuit compares the output voltages with the internal reference voltage VEO. This results in switching the status output to low. In H-Bridge condition this feature can be used to protect the low-side switches against short circuit during the OFF-period. Overtemperature Protection (valid only for the high-side-switches) The chip also incorporates an overtemperature protection circuit with hysteresis which switches off the output transistors and sets the status output to low. Undervoltage-Lockout (UVLO) When V S reaches the switch-on voltage VUVON the IC becomes active with a hysteresis. The High-Side output transistors are switched off if the supply voltage V S drops below the switch off value V UVOFF. |
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