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MC33810 Datasheet(PDF) 19 Page - Freescale Semiconductor, Inc |
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MC33810 Datasheet(HTML) 19 Page - Freescale Semiconductor, Inc |
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19 / 35 page  Analog Integrated Circuit Device Data Freescale Semiconductor 19 33810 FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES Figure 7. Open Secondary Spark Event The Open Secondary timer is initiated on the rising edge of the ignition coil primary spark signal and terminated on the falling edge. The rising edge Open Secondary Threshold is VIH= 135 V at primary, no hysteresis. The falling edge Open Secondary threshold is VIL = 135V. Collector to gate clamp durations that last longer than the selected Open Secondary Fault Time interval (Table 8) indicates a failed spark event. When the Open Secondary Fault Time is exceeded and the Low-voltage Clamp is enabled, the GDx output will activate the Low-voltage Clamp shown in figure 16. The Logic for this Low-voltage Clamp is defined in Figure 9 LOW-VOLTAGE CLAMP The Low-voltage Clamp is an internal clamp circuit which biases the IGBT's gate voltage in order to control the collector to emitter voltage to VPWR+11V. This technique is used to dissipate the energy stored in the ignition coil over a longer period of time than if the internal IGBT clamp were used. In the open secondary fault condition, all of the stored energy in the ignition coil is dissipated by the IGBT. This fault condition requires the use of a higher energy rated IGBT than would otherwise be needed. The Low-voltage Clamp spreads out the energy dissipation over a longer period of time, thus allowing the use of a lower energy rated IGBTs. The internal low-voltage clamp is connected between the IGBT's collector (through an external resistor) and the IGBT's gate. The energy stored in the ignition coil is dissipated by the IGBT, not the internal clamp. The internal clamp only provides the bias to the IGBT. Several logical signals are required as inputs to activate the GDx Low-voltage Clamp feature. The GDx Low-voltage Clamp feature may be disabled through bit 4 of the Spark Command message. Figure 8. Low-voltage Clamp Figure 9. Low-voltage Clamp Logic SOFT SHUTDOWN ENABLE The soft shutdown feature is enabled via the SPI by asserting control bit 5 in the Spark Command message. When enabled, the following events initiate a soft shutdown control of the gate driver. • OUTEN = High (Outputs Disabled) • Over-voltage on VPWR pin Table 8. Open Secondary Timer Spark Command Bits<b3,b2> Open Secondary Fault Timer OSFLT ( μs) 00 10 01 20 10 50 11 100 + – SPI +− VPWR 13 V 53 V GPGD Low V Clamp Clamp 100 µA GATE DRIVE CONTROL GD1 GD2 GD3 GD0 FB1 FB2 FB3 FB0 + – SPI Open Secondary SPI input SPARK DURATION OSFLT_En OSFLT MaxDwell MaxDwellEn IGN Mode VPWR OVER-VOLTAGE OUTEN SoftShutDnEn IGN Mode Activate Low-voltage Clamp |
Similar Part No. - MC33810_08 |
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Similar Description - MC33810_08 |
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