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L6235Q 数据表(PDF) 9 Page - STMicroelectronics |
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L6235Q 数据表(HTML) 9 Page - STMicroelectronics |
9 / 33 page L6235Q Circuit description Doc ID 018997 Rev 2 9/33 4 Circuit description 4.1 Power stages and charge pump The L6235Q integrates a 3-phase bridge, which consists of 6 power MOSFETs connected as shown in Figure 1, each power MOSFET has an RDS(ON) = 0.3 Ω (typical value @ 25 °C) with intrinsic fast freewheeling diode. Switching patterns are generated by the PWM current controller and the Hall effect sensor decoding logic (Chapter 4.3 on page 11). Cross conduction protection is implemented by using a dead time (tDT = 1 µs typical value) set by internal timing circuit between the turn-off and turn-on of two power MOSFETs in one leg of a bridge. Pins VSA and VSB must be connected together to the supply voltage (VS). Using an N-channel power MOSFET for the upper transistors in the bridge requires a gate drive voltage above the power supply voltage. The bootstrapped supply (VBOOT) is obtained through an internal oscillator and a few external components to realize a charge pump circuit, as shown in Figure 5. The oscillator output (pin VCP) is a square wave at 600 kHz (typically) with 10 V amplitude. Recommended values/part numbers for the charge pump circuit are shown in Table 5. Figure 5. Charge pump circuit Table 5. Charge pump external component values Component Value CBOOT 220 nF CP 10 nF RP 100 Ω D1 1N4148 D2 1N4148 AM02559v1 D2 CBOOT D1 RP CP VS VSA VCP VBOOT VSB |
类似零件编号 - L6235Q |
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类似说明 - L6235Q |
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