Overview
The MC33039D, produced by onsemi, is a high-performance closed-loop speed control adapter designed specifically for use in brushless DC motor control systems. This device enables precise speed regulation without the need for a magnetic or optical tachometer. It is primarily intended for use with the MC33035 brushless motor controller but can be used cost-effectively in various other closed-loop speed control applications.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Operating Voltage Range | VCC | 5.5 | - | - | V |
| Power Supply Current | ICC | 1.8 | 3.9 | 5.0 | mA |
| Zener Voltage (IZ = 10 mA) | VZ | 7.5 | 8.25 | 9.0 | V |
| Operating Junction Temperature | TJ | - | - | 150 | °C |
| Operating Ambient Temperature Range | TA | -40 | - | 85 | °C |
| Storage Temperature Range | Tstg | -65 | - | 150 | °C |
| Input Threshold Voltage High State | VIH | 2.1 | - | 2.4 | V |
| Input Threshold Voltage Low State | VIL | 0.7 | - | 1.0 | V |
| Output Pulse Width (Pin 5) | tPW | 205 | 225 | 245 | μs |
Key Features
- Digital detection of each input transition for improved low-speed motor operation.
- TTL compatible inputs with hysteresis for noise immunity.
- Operation down to 5.5 V for direct powering from the MC33035 reference.
- Internal shunt regulator allows operation from a non-regulated voltage source.
- Inverter output for easy conversion between 60°/300° and 120°/240° sensor phasing conventions.
- Pb-free packages are available.
Applications
The MC33039D is primarily used in closed-loop speed control systems for brushless DC motors. It is particularly suitable for applications where precise speed regulation is required without the use of a magnetic or optical tachometer. Common applications include:
- Brushless DC motor control systems.
- Industrial automation.
- Automotive systems.
- Consumer electronics requiring precise motor speed control.
Q & A
- What is the primary function of the MC33039D?
The MC33039D is a high-performance closed-loop speed control adapter designed for use in brushless DC motor control systems, enabling precise speed regulation without the need for a magnetic or optical tachometer.
- What are the key features of the MC33039D?
Key features include digital detection of input transitions, TTL compatible inputs with hysteresis, operation down to 5.5 V, an internal shunt regulator, and an inverter output for sensor phasing conversion.
- What is the operating voltage range of the MC33039D?
The MC33039D operates within a voltage range of 5.5 V to the maximum specified by the power supply section, typically up to the zener voltage.
- What is the purpose of the internal shunt regulator?
The internal shunt regulator allows the device to operate from a non-regulated voltage source, providing stability and reliability in various power supply conditions.
- How does the MC33039D handle sensor phasing conventions?
The MC33039D includes an inverter output that allows for easy conversion between 60°/300° and 120°/240° sensor phasing conventions, ensuring compatibility with different motor and controller configurations.
- What are the typical applications of the MC33039D?
Typical applications include brushless DC motor control systems, industrial automation, automotive systems, and consumer electronics requiring precise motor speed control.
- What is the operating temperature range of the MC33039D?
The MC33039D operates within an ambient temperature range of -40°C to +85°C.
- What is the storage temperature range for the MC33039D?
The storage temperature range is -65°C to +150°C.
- How does the MC33039D generate a speed-proportional output voltage?
The device generates output pulses whose average voltage increases with motor speed. When these pulses are fed through a low pass filter or integrator, a DC voltage proportional to the motor speed is generated.
- Is the MC33039D available in Pb-free packages?
- What is the significance of the programmable monostable in the MC33039D?
The programmable monostable allows for the generation of output pulses with a defined and programmable width, determined by the values selected for RT and CT.
