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L6574 датащи(PDF) 5 Page - STMicroelectronics |
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L6574 датащи(HTML) 5 Page - STMicroelectronics |
5 / 10 page 5/10 L6574 High/Low Side Driving Section: High and low side driving sections provide the proper drive to the external power MOSFET. A high sink/ source driving current (450/250 mA typical) ensures fast switching times when a size 4 external power MOSFET needs to be driven. Bootstrap Section: A patented integrated bootstrap section replaces an external bootstrap diode. This section together with a bootstrap capacitor provides the bootstrap voltage to drive the high side power MOSFET. This function is achieved using a high voltage DMOS driver which is driven synchronously with the low side external power MOSFET. For a safe operation, current flow into the Vboot pin is inhibited, even though ZVS operation may not be ensured. Timing Section: To set the proper preheat time (tpre=kpre*Cpre) for the bulb, a capacitor is connected to the Cpre pin which is charged with a fixed current. During tpre, the output is switching at fpre (see Oscillator Section). When the tpre expires, the Cpre capacitor is discharged and then recharged with a different current. This sets a second time interval tsh (0.1 times the selected preheat time tpre) during which frequency shifting from fpre to fing is performed to ensure lamp ignition. Timing Section kpre 1 Pre Heat Timing constant Cpre = 330nF 1.15 1.5 1.85 s/ µF kfs Frequency Shift Timing Constant Cpre = 330nF 0.115 0.15 0.185 s/ µF Vthpre Pre Heat Timing Comparator Threshold 3.3 3.5 3.7 V Sense OP AMP lib 6,7 Input Bias current 0.1 µA Vio Input Offset Voltage -10 10 mV Rout 5 Ouput Resistance 200 300 Ω Iout + Sink Output Current Vout = 0.2V 0.5 mA Iout - Source Output Current Vout = 4.5V 0.5 mA Vic 6,7 Common Mode Input Range -0.2 3 V GBW Sense Op Amp Gain Band Width Product 1MHz Gdc DC Open Loop Gain 80 dB Comparators Vthe 8,9 Enabling Comparators Threshold 0.56 0.6 0.64 V Vhye Enabling Comparators Hysteresis 20 100 mV tpulse Minimum Pulse lenght 200 ns ELECTRICAL CHARACTERISTCS (continued) (VS = 12V; VBOOT-VOUT = 12V; Tamb = 25°C) Symbol Pin Parameter Test Condition Min. Typ. Max. Unit |
Аналогичный номер детали - L6574 |
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Аналогичное описание - L6574 |
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