Electronic Speed Controller − ESC Sensorless Control HT66FM5240 Characteristics BLDCM ASSP Flash MCU : HT66FM5240 Human Machine Interface (HMI) : PPM or PWM signal Input Power : Li battery 2s / 3s at Max. 250W Solutions ◆ ◆ ◆ Motor drive control : Trapezoidal wave sensorless control Protection Functions : 1. Lock-phase, 2. Over Current, 3. Low Voltage, 4. Over Temperature Speed : 38000 RPM under load conditions PCBA : Transistor gate driver solution, low cost, best cost performance Battery input BEMF detection circuit HMI : PWM, PPM signal HT66FM5240 Application Areas Motor : U, V, W Block Diagram DC/DC Converter DC Input HT66FM5240 BLDC Motor Control Circuit Speed Command Pri-Driver & MOSFETs BLDC Motor PTM OCP Resister Divider ADC Resister Divider CMP x 3 Temp. Application Circuit R7 10K R1 U 8.2K R8 R4 C1 3K 334 10K U3 R2 V GND 8.2K R9 10K R10 10K R5 C2 3K 334 R3 GND GND C4 8.2K R11 10K R6 C3 3K 334 1 2 3 4 5 6 7 8 9 10 START VR VCC W VCC VCC 104 IS_DET AT AB R12 10K PA6/AN7 PA7/AN6 VSS VDD PA1/AP/AN3 PB0/AN2 PB1/AN1 PB2/AN0 PC0/GAT PC1/GAB PA5/H3 PA4/H2 PA3/H1 PB3/C1N PA2/SCL PA0/SDA PC5/GCB PC4/GCT PC3/GBB PC2/GBT 20 19 18 17 16 15 14 13 12 11 VR C5 104 C6 J3 CB CT BB BT GND C7 104 GND Q1 2N3904 C8 4.7uF D1 FR107 R15 222 Q4 MOSFET-N R16 100 R16 100 GND C11 100uF/25V C12 104 7805 VCC Vin Vout CT BT AT GND R21 Q5 MOSFET-N BB 100 R21 Q5 MOSFET-N R21 CB 100 Q5 MOSFET-N 100 R27 IS_DET C15 2.2UF 2 U2 1 GND 2 3 2 1 W GND VIN J4 R24 472 V GND 1 Q4 MOSFET-N Q1 2N3904 C8 4.7uF R24 472 U AB D1 FR107 R15 222 Q4 MOSFET-N Q1 2N3904 C8 4.7uF R24 472 J2 GND VIN R16 100 R14 200 START HT66FM5230-20SSOP D1 FR107 R15 222 100 104 1 2 3 4 GND J1 1 2 3 R13 20K R28 0.1/3W GND J5 3 2 1 U V W 3 C13 100uF/16V C14 104