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L6228Q датащи(PDF) 11 Page - STMicroelectronics |
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L6228Q датащи(HTML) 11 Page - STMicroelectronics |
11 / 32 page L6228Q Circuit description Doc ID 14321 Rev 4 11/32 4 Circuit description 4.1 Power stages and charge pump The L6228Q integrates two independent power MOS full bridges. Each power MOS has an RDS(on) = 0.73 Ω (typical value @ 25 °C), with intrinsic fast freewheeling diode. Switching patterns are generated by the PWM Current Controller and the Phase Sequence Generator (see below). Cross conduction protection is achieved using a dead time (t DT = 1 μs typical value) between the switch off and switch on of two power MOSFETs in one leg of a bridge. Pins VSA and VSB must be connected together to the supply voltage VS. The device operates with a supply voltage in the range from 8 V to 52 V. It has to be noticed that the RDS(on) increases of some percents when the supply voltage is in the range from 8 V to 12 V. Using N-channel power MOS for the upper transistors in the bridge requires a gate drive voltage above the power supply voltage. The bootstrapped supply voltage V BOOT is obtained through an internal Oscillator and few external components to realize a charge pump circuit as shown in Figure 8. The oscillator output (VCP) is a square wave at 600 kHz (typical) with 10V amplitude. Recommended values/part numbers for the charge pump circuit are shown in Table 6. Figure 8. Charge pump circuit Table 6. Charge pump external components values Component Value CBOOT 220 nF CP 10 nF D1 1N4148 D2 1N4148 D2 CBOOT D1 CP VS VSA VCP VBOOT VSB D01IN1328 |
Аналогичный номер детали - L6228Q |
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Аналогичное описание - L6228Q |
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