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L6375 数据表(PDF) 7 Page - STMicroelectronics |
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L6375 数据表(HTML) 7 Page - STMicroelectronics |
7 / 12 page 7/12 L6375 ditions may occur A) the overload is still present, and then the output power MOS is again driven in linear mode (limiting the output current to Isc) for another Ton, starting a new cycle, or B) the overload condition is removed, and the output power MOS is no longer driven in linear mode. All these occurrences are presented on the DIAG2 pin (see fig 2). We call this unique feature Non Dissipative Short Circuit Protection and it ensures a very safe operation even in permanent overload conditions. Note that choosing the most appropriate value for the Ton interval (i.e. the value of the Cdon capacitor) a delay (the Ton itself) will prevent that a misleading Short Circuit information is presented on the DIAG2 output, when driving capacitive loads (that acts like short circuit in the very beginning) or Incandescent Lamp (a cold filament has a very low resistive value). The Non Dissipative Short Circuit Pro- tection can be disabled (keeping Ton = 0 but with the output current still limited to Isc, and Diagnostic dis- abled)simply shorting to ground the the ON DELAY pin. Figure 2. Non Dissipative Short Circuit Protection Operation DIAGNOSTIC LOGIC The operating conditions of the device are permanently monitored and the following occurrences are signalled via the DIAG1/DIAG2 open-drain output pins see: diagnostic Truth Table. - Short Circuit versus ground. - Short Circuit versus VS. - Under Voltage(UV) - Over Temperature (OVT) - Open Load, if the output current is less than 3mA (typical value). DEMAGNETIZATION OF INDUCTIVE LOADS An internal zener diode, limiting the voltage across the Power MOS to between 50 and 60V (Vcl), provides safe and fast demagnetization of inductive loads without external clamping devices. The maximum energy that can be absorbed from an inductive load is specified as 200mJ (at Tj =85°C) OUTPUT CURRENT tON tON tOFF tOFF Time t<tON DIAG (active low) Time Short Circuit Short Circuit Isc Iout D94IN105 |
类似零件编号 - L6375 |
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类似说明 - L6375 |
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