JUYI
JUYI Sensorless brushless DC motor controller IC JY02A with EAI self-adaptation function
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JUYI Sensorless brushless DC motor controller IC JY02A with EAI self-adaptation function
JY02A Application Features：
JY02A Sensorless Brushless DC Motor Dedicated Control IC
The JY02A is a specialized integrated circuit designed for driving sensorless brushless DC motors. It features a simple peripheral circuit, comprehensive functionality, compact size, easy debugging (almost plug-and-play), high driving efficiency, flexible application, and wide applicability.
As a pure hardware solution, the JY02A eliminates programming requirements while integrating multiple motor control circuits:
1. Adaptive start-up circuit
2. Power compensation circuit
3. Q-value correction circuit
4. Power factor correction
5. Phase detection circuit
6. Bidirectional rotation decoding circuit
7. Stall protection circuit
8. Back-EMF detection circuit
9. Current detection & control system
10. Voltage monitoring & protection
Through minimal external component adjustment, this IC effectively drives various sensorless BLDC motors. Notably, its moderate load-starting capability proves crucial for most applications. The JY02A supports both 'Y' and 'Delta' connection methods for three-phase brushless DC motors, demonstrating exceptional compatibility across different motor configurations.
JY02A Application Characteristics：
• Working voltage: 4.5 v-5.5 V • Working temperature: -55-125 ℃
• Drive mode: SPWM • Adaptive motor: Sensorless BLDC motor
• Direction control: CW/CCW • Soft reversing: Yes
• Speed signal: Yes • Overload protection: Yes
• Current closed loop: Yes • Constant current drive: Yes
• Blocking protection: Yes • Starting torque regulation: Yes
• Soft starting: Yes • EAI self-adaptation function
• Special technology: JYKJ full condition safety start function
• Speed adjustment: linear
Package Size:
Diagram of Pin Function Description:
DC Electrical Characteristics:
JY02A internal functional block diagram:
NOTES: JY02A drive signal is positive polarity output, choosing adapted MOS drive circuit and power MOS is very important!
JY02A drive mode and parameters:
1. High/Low-Side Drive Architecture
The upper arms (UH/VH/WH) employ PWM outputs, while the lower arms (UL/VL/WL) utilize commutation outputs. This configuration optimizes hardware cost reduction, particularly in high-voltage or high-power applications. Compared to PWM-driven lower arms, the upper-arm PWM approach simplifies circuitry (e.g., reduced gate driver complexity) and improves system stability through minimized switching losses.2. 13kHz PWM Frequency Optimization
JY02A operates at 13kHz PWM frequency, striking an ideal balance between:- Efficiency: Reduced switching losses (vs. higher frequencies like 20kHz)
- Acoustic Performance: Audible noise suppression within human sensitivity range (8kHz-16kHz)
- Torque Enhancement: 20% higher torque output under identical power supply conditions compared to 20kHz operation, achieved through optimized dead-time control and current ripple minimization.
3. Commutation-Based Pulse Signal Characteristics
JY02A generates one pulse per commutation cycle, with critical operational notes:- Pulse-Rotation Relationship: Pulse count ≠ mechanical rotation (e.g., 6-pulse/rev for 2-pole-pair inner rotor motors, as shown in Figure 1).
- Structural Dependency: Pulse frequency correlates with pole-pair configuration (N pulses/rev = 3×pole pairs).
- Application Guidelines: Avoid direct RPM calculation from pulse count; implement external encoder or Hall sensors for precise speed feedback.
Schematic Diagram of Internal Rotor 2-Pole Pair Motor Structure
Forward Drive output Waveform Diagram:
(SPWM Output Approximates Sinusoidal Waveform, Effectively Suppressing Electromagnetic Noise)
Reversing Drive Output Waveform Diagram：
(SPWM Output Approximates Sinusoidal Waveform, Effectively Suppressing Electromagnetic Noise)
Schematic of application：
JY02A Sensorless Brushless DC Motor Driver Typical Application Schematic Diagram
Note: Is is the current signal feedback input terminal. When the voltage at the Is terminal reaches 40mV, the system activates the overload monitoring and enters the constant - current control state. The driving current will no longer increase with the increase of the voltage at the VR terminal or the load. This function effectively prevents the problem of burning out the driving power MOS tubes due to an excessive load. It can continuously supply energy to the motor and maintain the maximum driving state. When the current continues to increase due to an accident and the voltage at the Is terminal reaches or exceeds 90mV, JY02A will immediately enter the protection state and turn off all outputs. The protection state will only be lifted when the voltage at the VR terminal drops to 0V or when the power is turned on again.
Functional description and application considerations:
a)Overload protection and current sampling resistance value selection:
JY02A has a relatively complete overload protection function. the overload protection
and current abnormal protection function of JY02A will take effect only under the
condition of the current sampling resistor R is selected properly. When the Is pin voltage
reaches 0.40mV, the overload monitoring starts and enter into constant current state and
keeps the driving current constant. At this state, the driving current no longer rises with
the voltage of the VR pin, and will not increase with the increase of the load. In this state,JY02A will continue to provide a constant power for the motor and keeps the motor in normal working state. If the Is pin voltage reaches or exceeds 90mV, the system will judge all the outputs within 4.5 microseconds.
Here is a detailed example how to select properly R value as follow:
R value formula: I = 0.04/R
I: Constant current setting value, unit: A
0.04: is the voltage value of Is pin of JY02A
R: current limiting resistance, unit: Ohm
For example, a controller with an operating current of 3A , set the constant current to
5A for safety, and the system keep the current at 5A when the current reaches or exceeds 5A, after the formula I = 0.04 /R, R=0.04/I so R value = 0.04 / 5=0.008 Ohm, so the current sampling resistor should use a power resistor of 8 milliohms (current sampling resistor normally is cement resistor and constantan wire)
b) locked-rotor protection: JY02A has automatic restart function. Once the running motor is blocked by external force, the system will automatically protect and restart. If the restart is unsuccessful for 10 times, it will automatically stop output. Disconnect the power or reduce the voltage of the VR pin to 0V to unlock the protection. Increase the VR voltage to restart the motor.
c) Z/F soft reversing：The 16th pin Z/F of JY02A is the reversing control pin. This pin can be connected to 5V or GND. JY02A has soft reversing function. This function protects the MOSFET and motor in many applications, and improves the reliability and service life, the specific operation is that when the motor is rotating in one direction, when the Z/F voltage level changes, the driver stops output first, the motor rotates freely till stop, and then starts to run in the other direction.
d) FG speed signal feedback：JY02A also outputs the speed pulse signal while driving the motor. JY02A will output one pulse every phase commutating. This is perfectly reflected in high-end applications. In the case of precise speed control, such as DC brushless fan, DC Brushless pumps, etc.,
With the speed signal feedback, these functions are easy to achieve, Such as require stable speed and stable torque, and closed-loop control solution.
e) TC Temperature protection port：JY02A has an external connect temperature protection function.The application is quite simple, only an external NTC and a resistor are required, can place the NTC in the place where need be monitored, such as MOSFET or motor. When the temperature reaches a certain value, the system will automatically protect, the system will restart after the temperature down to safety value. it is recommended parameters of NTC: NTC of 10K3950K, divider resistor with 10K 1%, according to this parameter, the temperature will automatically protect when the temperature reaches 100 degrees, of course, you can also replace other
models NTC or adjust divider resistor according to the actual application. The value of the
resistor reaches the temperature value that you want to protect.
f) QD Starting torque adjustment：By adjusting the voltage of the QD terminal, the starting torque can be directly changed. The voltage adjustment range is 0V-2.5V, and the normal motor starting torque voltage is between 0V - 0.8V (the starting torque is not as bigger as better)
Summary：
There are many factors affecting the DC brushless Hallless motor driver, such as the working voltage,speed, commutation angle, load, inductance, back EMF, starting load, etc., which will affect the DC brushless motor drive performance. The driving effect of the motor, so more testing are required to make a perfect high-efficiency, stable DC brushless sensorless motor driver .
If you need more information about the JY02A chip or the product application schematic diagram, We are warmly welcome you contact with us. Thank you !
