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L6226 датащи(PDF) 11 Page - STMicroelectronics |
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L6226 датащи(HTML) 11 Page - STMicroelectronics |
11 / 31 page L6226 Circuit description Doc ID 9452 Rev 4 11/31 4 Circuit description 4.1 Power stages and charge pump The L6226 integrates two independent Power MOS full bridges. Each Power MOS has an RDSon = 0.73 Ω (typical value @ 25 °C), with intrinsic fast freewheeling diode. Cross conduction protection is achieved using a dead time (td = 1 μs typical) between the switch off and switch on of two Power MOS in one leg of a bridge. Using N channel power MOS for the upper transistors in the bridge requires a gate drive voltage above the power supply voltage. The Bootstrapped (VBOOT) supply is obtained through an internal oscillator and few external components to realize a charge pump circuit as shown in Figure 5. The oscillator output (VCP) is a square wave at 600 kHz (typical) with 10 V amplitude. Recommended values/part numbers for the charge pump circuit are shown in Table 6. Figure 5. Charge pump circuit 4.2 Logic inputs Pins IN1A, IN2A, IN1B, IN2B, ENA and ENB are TTL/ CMOS and microcontroller compatible logic inputs. The internal structure is shown in Figure 4. Typical value for turn-on and turn-off thresholds are respectively Vthon=1.8V and Vthoff = 1.3V. Pins ENA and ENB are commonly used to implement Overcurrent and Thermal protection by connecting them respectively to the outputs OCDA and OCDB, which are open-drain outputs. If that type of connection is chosen, some care needs to be taken in driving these pins. Two configurations are shown in Figure 7 and Figure 8. If driven by an open drain (collector) structure, a pull-up resistor REN and a capacitor CEN are connected as shown in Figure 7. If the driver is a standard Push- Pull structure the resistor REN and the capacitor CEN are connected as shown in Figure 8. The resistor REN should be chosen in the range from 2.2 k Ω to 180 kΩ. Recommended values for REN and CEN are respectively 100 k Ω and 5.6 nF. More information on selecting the values is found in the overcurrent protection section. Table 6. Charge pump external components values CBOOT 220 nF CP 10 nF D1 1N4148 D2 1N4148 |
Аналогичный номер детали - L6226 |
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Аналогичное описание - L6226 |
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