Overview
The LV88554RTXG, produced by onsemi, is a single-phase full-wave drive pre-driver integrated circuit designed for controlling Brushless DC (BLDC) motors. This device is part of the LV8855x series, which includes closed-loop speed control and various adjustable parameters to optimize motor performance. It is particularly suited for applications requiring low vibration and noise, and it offers dynamic lead angle adjustment and feedback speed control.
Key Specifications
| Parameter | Symbol | Conditions | Ratings | Unit |
|---|---|---|---|---|
| Maximum supply voltage | VCCmax | VCC pin | 20 | V |
| Maximum output voltage | VOUTmax | O1H/O1L/O2H/O2L pin | 20 | V |
| Maximum output current | IOUTmax | O1H/O1L/O2H/O2L pin | 50 | mA |
| Maximum output peak current | IOUTpeak | O1H/O1L/O2H/O2L pin | 150 | mA |
| REG pin maximum output current | IREGmax | REG pin | 20 | mA |
| PWM pin maximum input voltage | VPWMmax | PWM pin | 5.5 | V |
| PWM output frequency | fpwmo | 45.6 - 50.4 | kHz | |
| Circuit current | ICC | 9 - 16 | mA |
Key Features
- Single-phase Full Wave Drive Pre-driver with Closed Loop Speed Control
- Speed Control Function by PWM Duty Input (25 Hz to 100 kHz)
- Soft Start-up Function and PWM Soft Switching Phase Transition
- Built-in Current Limit Circuit and Thermal Protection Circuit
- Built-in Locked Rotor Protection and Auto Recovery Circuit
- Dynamic Lead Angle Adjustment with Respect to Rotational Speed
- Lead-angle Control Parameters can be Configured
- Lineup of Different Closed Loop Gain Selection (Low gain for LV88554)
- Lineup of Rotation Signal Output Selection (RD for LV88554)
- Pb-Free and Halogen-Free Device
Applications
- PC & Computing Equipment
- Refrigerator
- Games
Q & A
- What type of motor does the LV88554RTXG control?
The LV88554RTXG controls single-phase Brushless DC (BLDC) motors.
- What is the maximum supply voltage for the LV88554RTXG?
The maximum supply voltage is 20 V.
- What is the purpose of the PWM input pin?
The PWM input pin controls the rotational speed of the motor by reading the duty cycle of the PWM pulse.
- How does the dynamic lead angle adjustment work?
The dynamic lead angle adjustment is set using the LAI and LAG pins, which allow for the adjustment of lead angles at low and high speed sides of the motor.
- What protection circuits are built into the LV88554RTXG?
The device includes built-in current limit circuit, thermal protection circuit, and locked rotor protection with auto recovery.
- What is the significance of the REG pin?
The REG pin provides an internal 5.0 V voltage regulator, which is necessary for stabilizing the logic circuit power supply.
- How is the rotation speed setting curve configured?
The rotation speed setting curve is configured using the RSA, RSB, PIX, and PIZ pins, which set the rotation speed values and input duty parameters.
- What is the function of the SFS pin?
The SFS pin is used for soft start adjustment and setting the dead time, allowing for synchronous rectification drive for high efficiency.
- Is the LV88554RTXG Pb-Free and Halogen-Free?
- What is the recommended package type for the LV88554RTXG?
The device is available in SSOP20J and VCT20 packages.
