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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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BTS7960 Fiches technique(PDF) 18 Page - Infineon Technologies AG |
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BTS7960 Fiches technique(HTML) 18 Page - Infineon Technologies AG |
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18 / 28 page  High Current PN Half Bridge BTS 7960 Block Description and Characteristics Data Sheet 17 Rev. 1.1, 2004-12-07 4.4 Control and Diagnostics 4.4.1 Input Circuit The control inputs IN and INH consist of TTL/CMOS compatible schmitt triggers with hysteresis which control the integrated gate drivers for the MOSFETs. Setting the INH pin to high enables the device. In this condition one of the two power switches is switched on depending on the status of the IN pin. To deactivate both switches, the INH pin has to be set to low. No external driver is needed. The BTS 7960 can be interfaced directly to a microcontroller. 4.4.2 Dead Time Generation In bridge applications it has to be assured that the highside and lowside MOSFET are not conducting at the same time, connecting directly the battery voltage to GND. This is assured by a circuit in the driver IC, generating a so called dead time between switching off one MOSFET and switching on the other. The dead time generated in the driver IC is automatically adjusted to the selected slew rate. 4.4.3 Adjustable Slew Rate In order to optimize electromagnetic emission, the switching speed of the MOSFETs is adjustable by an external resistor. The slew rate pin SR allows the user to optimize the balance between emission and power dissipation within his own application by connecting an external resistor RSR to GND. 4.4.4 Status Flag Diagnosis With Current Sense Capability The status pin IS is used as a combined current sense and error flag output. In normal operation (current sense mode), a current source is connected to the status pin, which delivers a current proportional to the forward load current flowing through the active high side switch. If the high side switch is inactive or the current is flowing in the reverse direction no current will be driven except for a marginal leakage current IIS(LK). The external resistor RIS determines the voltage per output current. E.g. with the nominal value of 8500 for the current sense ratio k ILIS = IL / IIS, a resistor value of RIS = 1kΩ leads to VIS = (IL / 8.5 A)V. In case of a fault condition the status output is connected to a current source which is independent of the load current and provides I IS(lim). The maximum voltage at the IS pin is determined by the choice of the external resistor and the supply voltage. In case of current limitation the IIS(lim) is activated for 2 * tCLS. |
Numéro de pièce similaire - BTS7960 |
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Description similaire - BTS7960 |
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