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MCZ33198EFR2 bảng dữ liệu(PDF) 11 Page - Freescale Semiconductor, Inc |
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MCZ33198EFR2 bảng dữ liệu(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 17 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 33198 FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION The MC33198 is a high side TMOS driver, dedicated to automotive applications. It is used in conjunction with an external power MOSFET for high side drive applications. The device can drive and protect a large variety of MOSFETs. The device has a CMOS compatible input control, charge pump to drive the MOSFET gate, and fault detection circuitry based on programmable VDS monitoring to detect shorted loads. It also includes a programmable timer function to eliminate undesired switch off due to in rush currents, and a status pin which reports the output status of both on and off MOSFET states. The device uses few external components, and offers an economical solution to large current high side switches. It also has PWM capability up to 1kHz. POWER SUPPLY The MC33198 can be supplied from the battery line. It is designed with a 60V technology, making it able to sustain up to 60V transient pulses. In the off state, with pin 7 low, the supply current can be up to 5.0mA, and in operation, pin 7 high, the current up to 25mA. The device has an undervoltage detection and shutdown near 7.0V. Below this value the MOSFET is turned off. There is also a 25V overvoltage detection which switches off the output pin 4 to protect both the MOSFET and the load when VCC is higher than 25V. CHARGE PUMP The device incorporates a self running charge pump with an internal capacitor and is connected at Gate pin 4. To prevent oscillation, a serial resistor can be added. The charge pump is able to charge a 25nF capacitor in less than 1ms. This allows the MC33198 to have a rapid response time and to drive the external TMOS gate very quickly, allowing fast switching on of the load. The device has an internal 15V zener diode between pin 4 and 1, to clamp the Gate-to- Source voltage and protect the MOSFET gate oxide from destruction. See Dynamic Electrical Characteristics on page 7 for details. BAND GAP AND REFERENCE CURRENTS The MC33198 has an internal band gap reference voltage which generates all the internal thresholds. This band gap is also used to generate internal reference currents necessary for proper operation of the device. These currents are : Pin 2 : Drain current (typically 80mA). Pin 4 : High and low gate discharge currents (typically 100mA and 10mA). Pin 8 : Timer charge current (10mA typical). All these currents are derived from the same reference voltage and internal resistor. Their accuracy and variability is approximately +-25% over the full temperature and voltage range. In addition, a passive pull down current of 5.0mA maintains the gate of the MOSFET below 0.9V when the device has no supply, ensuring that the MOSFET remains off. This passive pulldown current is operating even if device VCC (pin 5) is not powered up. INPUT CIRCUITRY The Input pin (pin 7) of the device is CMOS compatible and can be directly connected to a microcontroller. The input current is determined by an internal pull down resistor, typically 36kW. A hysteresis of 0.8 V minimum is present at this input. OUTPUT STATUS The device has a status output (pin 6) which has an open collector structure. This pin is used to report the MOSFET overload condition or the LOAD status when the MOSFET is off. The device Pin 1 (Source) is compared to a programmable threshold at Pin 2, in both the on and off state of the MOSFET. This allows the detection of the MOSFET over VDS or over load conditions when the MOSFET is on and the load short to VBAT monitoring, when the MOSFET is in the off state. This status pin is normally connected to a pull- up resistor and a micro input, and can drive up to 1.0mA. TIMER The Timer pin (pin 8) is used in conjunction with an external capacitor to create a delay between the overload detection and the shutdown of the MOSFET. In case of over load, the internal current source pin 8 will charge the capacitor. When the voltage at pin 8 reaches the 5.5V threshold, the internal C3 comparator will be triggered and switch off the output to protect the MOSFET. The fault and the MOSFET turn off condition are latched and are reset by switching the input off and on. The delay between the overload detection and actual MOSFET turn off is used to allow a temporary overload which will prevent the system from switching off during possible inrush currents or transients. MOSFET PROTECTION AND OUTPUT VOLTAGE MONITORING The MC33198 has the ability to sense the output MOSFET source voltage and compare it to a predetermined threshold. This threshold is programmable, using the internal reference current of 80mA and an external resistor connected at pin 2 (DRN). The device can monitor the output load voltage, as well as protect the MOSFET in case of overload. The overload detection threshold must be adapted to the MOSFET itself depending on the load to be driven and the thermal capability of the MOSFET. In practice, the maximum acceptable VDS of the MOSFET should be determined and based upon the MOSFET maximum power dissipation. |
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Mô tả tương tự - MCZ33198EFR2 |
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