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L6235PD 数据表(PDF) 18 Page - STMicroelectronics |
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L6235PD 数据表(HTML) 18 Page - STMicroelectronics |
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18 / 25 page ![]() L6235 18/25 APPLICATION INFORMATION A typical application using L6235 is shown in Figure 21. Typical component values for the application are shown in Table 3. A high quality ceramic capacitor (C2) in the range of 100nF to 200nF should be placed between the power pins VSA and VSB and ground near the L6235 to improve the high frequency filtering on the power supply and reduce high frequency transients generated by the switching. The capacitor (CEN) connected from the EN input to ground sets the shut down time when an over current is detected (see Overcurrent Protection). The two current sensing inputs (SENSEA and SENSEB) should be connected to the sensing resistor RSENSE with a trace length as short as possible in the layout. The sense resistor should be non-inductive resistor to minimize the di/ dt transients across the resistor. To increase noise immunity, unused logic pins are best connected to 5V (High Logic Level) or GND (Low Logic Level) (see pin description). It is recommended to keep Power Ground and Signal Ground separated on PCB. Table 3. Component Values for Typical Application. Figure 21. Typical Application C1 100µF R1 5K6 Ω C2 100nF R2 1K8 Ω C3 220nF R3 4K7 Ω CBOOT 220nF R4 1M Ω COFF 1nF RDD 1K Ω CPUL 10nF REN 100K Ω CREF1 33nF RP 100 Ω CREF2 100nF RSENSE 0.3 Ω CEN 5.6nF ROFF 33K Ω CP 10nF RPUL 47K Ω D1 1N4148 RH1, RH2, RH3 10K Ω D2 1N4148 VREF + - BRAKE 14 5 18 19 21 16 OUT1 H1 H2 H3 GND RCOFF OUT3 OUT2 VSA POWER GROUND SIGNAL GROUND +5V + - VS 8-52VDC 13 VSB VCP VBOOT CP CBOOT RP D2 D1 C1 C2 SENSEA RSENSE 20 BRAKE 6 7 DIAG EN CEN REN ENABLE 2 FWD/REV FWD/REV 11 TACHO 8 12 1 23 24 4 17 3 15 22 SENSEB THREE-PHASE MOTOR COFF ROFF RH1 RH2 RH3 10 CREF1 R2 R3 R1 RDD R4 C3 CREF2 RCPULSE 9 CPUL RPUL D02IN1357 M VREF 5V HALL SENSOR |
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