PDF L6235Q Data sheet ( Hoja de datos )

Número de pieza	L6235Q
Descripción	DMOS driver
Fabricantes	STMicroelectronics
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No Preview Available ! L6235Q DMOS driver for 3-phase brushless dc motor Features ■ Operating supply voltage from 8 to 52 V ■ 5.6 A output peak current ■ RDS(on) 0.3 Ω typ. value @ TJ = 25 °C ■ Operating frequency up to 100 kHz ■ Non-dissipative overcurrent protection ■ Diagnostic output ■ Constant tOFF PWM current controller ■ Slow decay synchronous rectification ■ 60° and 120° Hall effect decoding logic ■ Brake function ■ Tacho output for speed loop ■ Cross conduction protection ■ Thermal shutdown ■ Undervoltage lockout ■ Integrated fast freewheeling diodes Figure 1. Block diagram QFN-48 (7 x 7 mm) Description The L6235Q is a DMOS fully integrated 3-phase motor driver with overcurrent protection. Realized in BCDmultipower technology, the device combines isolated DMOS power transistors with CMOS and bipolar circuits on the same chip. The device includes all the circuitry needed to drive a 3-phase BLDC motor including: a 3-phase DMOS bridge, a constant OFF time PWM current controller and the decoding logic for single ended Hall sensors that generates the required sequence for the power stage. Available in QFN48 7x7 package, the L6235Q features a non- dissipative overcurrent protection on the high-side power MOSFETs and thermal shutdown. VBOOT VCP DIAG EN BRAKE FWD/REV H3 H2 H1 RCPULSE TACHO VBOOT CHARGE PUMP THERMAL PROTECTION OCD OCD1 OCD2 OCD3 OCD VBOOT OCD1 10V VBOOT HALL-EFFECT SENSORS DECODING LOGIC GATE LOGIC OCD2 10V VBOOT TACHO MONOSTABLE 10V 5V VOLTAGE REGULATOR OCD3 10V ONE SHOT MONOSTABLE PWM MASKING TIME + SENSE - COMPARATOR VSA OUT1 OUT2 SENSEA VSB OUT3 SENSEB VREF RCOFF AM02555v1 November 2011 Doc ID 018997 Rev 2 1/33 www.st.com 33 1 page L6235Q Pin connection Table 3. Pin 15, 16 17 18 19 20 21 22, 23 26, 27 34, 35 38, 39 40 41 42 Pin description (continued) Name Type Function SENSEB Power supply Half bridge 3 source pin. This pin must be connected together with pin SENSEA to power ground through a sensing power resistor. At this pin also the inverting input of the sense comparator is connected. FWD/REV EN VREF Logic input Logic input Logic input Selects the direction of the rotation. High logic level sets forward operation, whereas low logic level sets reverse operation. If not used, it must be connected to GND or +5 V. Chip enable. Low logic level switches off all power MOSFETs. If not used, it must be connected to +5 V. Current controller reference voltage. Do not leave this pin open or connect to GND. BRAKE VBOOT OUT3 VSB VSA OUT2 VCP H2 H3 Logic input Brake input pin. Low logic level switches on all high-side power MOSFETs, implementing the brake function. If not used, it must be connected to +5 V. Supply voltage Bootstrap voltage needed for driving the upper power MOSFETs. Power output Output 3. Power supply Power supply Power output Half bridge 3 power supply voltage. It must be connected to the supply voltage together with pin VSA. Half bridge 1 and half bridge 2 power supply voltage. It must be connected to the supply voltage together with pin VSB. Output 2. Output Charge pump oscillator output. Sensor input Single ended Hall effect sensor input 2. Sensor input Single ended Hall effect sensor input 3. Doc ID 018997 Rev 2 5/33 5 Page L6235Q Circuit description 4.3 PWM current control The L6235Q includes a constant OFF time PWM current controller. The current control circuit senses the bridge current by sensing the voltage drop across an external sense resistor connected between the source of the three lower power MOSFET transistors and ground, as shown in Figure 9. As the current in the motor increases, the voltage across the sense resistor increases proportionally. When the voltage drop across the sense resistor becomes greater than the voltage at the reference input pin VREF, the sense comparator triggers the monostable switching the bridge off. The power MOSFET remains off for the time set by the monostable and the motor current recirculates around the upper half of the bridge in slow decay mode, as described in Section 4.4. When the monostable times out, the bridge again turns on. Since the internal dead time, used to prevent cross conduction in the bridge, delays the turn-on of the power MOSFET, the effective OFF time tOFF is the sum of the monostable time plus the dead time. Figure 10 shows the typical operating waveforms of the output current, the voltage drop across the sensing resistor, the pin RC voltage and the status of the bridge. More details regarding the synchronous rectification and the output stage configuration are included in Section 4.4. Immediately after the power MOSFET turns on, a high peak current flows through the sense resistor due to the reverse recovery of the freewheeling diodes. The L6235 provides a 1µs blanking time tBLANK that inhibits the comparator output so that the current spike cannot prematurely re-trigger the monostable. Figure 9. PWM current controller simplified schematic TO GATE LOGIC 5mA (0) (1) S Q R - 5V + 2.5V BLANKING TIME MONOSTABLE 1μs VSB FROM THE LOW-SIDE GATE DRIVERS MONOSTABLE SET BLANKER DRIVERS + DEAD TIME DRIVERS + DEAD TIME VSA DRIVERS + DEAD TIME COFF RCOFF ROFF SENSE COMPARATOR + - VREF RSENSE SENSEB SENSEA VS OUT2 OUT3 OUT1 Doc ID 018997 Rev 2 11/33 11 Page

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