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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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L6353 Fiches technique(PDF) 8 Page - STMicroelectronics |
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L6353 Fiches technique(HTML) 8 Page - STMicroelectronics |
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8 / 11 page  VCLAMP_PROG = VCL 6 with 7V < VCL <11V Leaving the CLAMP_PROG pin floating the VCL level is set to 9V. If the pin is grounded the func- tion is inhibited (i.e. no intermediate step during the firing). Third step Parameter: VONth At the end of the tMON_DELAY the gate of the driven device is pulled toward the VPOS level in order to ensure an appropriate drive to minimize the power losses. The external power device is considered in overload whenever the voltage on its output, sensed via the VON_SENSE pin, is above VONth. The comparison value is programmable setting at a certain level, by means of a resistive divider, the ON_LEV_PROG pin according to the following formula: VON_LEV_PROG =VONth. 0.17 with 5V < VONth. < 15V and VONth.< VCC -1V. If the ON_LEV_PROG pin is left floating theVONth. level is set to 7.5V. The overload status is signalled via the ALARM pin, active LOW. To inhibite the VON Monitor func- tion, the VSENSE pins must be grounded. THERMAL PROCEDURE As the junction temperature raises, two different events will take place. When the Over Tempera- ture Threshold (Tth1), set at 130 °C is reached, the ALARM output is activated (low level). If the tem- perature keeps on raising, up to the Over Tem- peratur Shutdown (Tth2 = 160 °C Typ) the output power device is turned off until the temperature decrease. To prevent an oscillating behaviour both the thresholds have a built-in hysteresis of 20 °C. UNDERVOLTAGE LOCK OUT To avoid operation with non optimal drive of the external power device, an Undervoltage Lockout function is implemented. The OUT1 pin is forced close to VSS until the VCC supply voltage has reached the Undervoltage Upper Threshold (VCCth2) value. If the supply voltage falls below the lower hysteresis value (i.e. VCCth1 -VCChys) the OUT1 will be again forced close to VSS. The built-in hysteresis will thus avoid intermittent func- tioning of the device at low supply voltage that may have a superimposed ripple. Vs D94IN126B Vccth Vcchys Undervoltage Comparator Hysteresis L6353 8/11 |
Numéro de pièce similaire - L6353 |
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Description similaire - L6353 |
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