Overview
The MC33033DWR2G is a high-performance, second-generation, monolithic brushless DC motor controller produced by ON Semiconductor. It is designed to implement open-loop, three or four phase motor control systems. This device is derived from ON Semiconductor’s full-featured MC33034 and MC33035 controllers but with limited features. The MC33033DWR2G includes a rotor position decoder, a temperature-compensated reference capable of supplying sensor power, a frequency-programmable sawtooth oscillator, a fully accessible error amplifier, a pulse width modulator comparator, and high current drivers for power MOSFETs. It also features protective mechanisms such as undervoltage lockout, cycle-by-cycle current limiting, and internal thermal shutdown.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage | VCC | - | - | 30 | V |
| Reference Output Voltage | Vref | 5.9 | 6.24 | 6.57 | V |
| Top Drive Output Sink Current | ISink(top) | - | - | 50 | mA |
| Bottom Drive Output Current | IDRV | - | - | 100 | mA |
| Operating Junction Temperature | TJ | - | - | 150 | °C |
| Operating Ambient Temperature Range | TA | -40 | - | 85 | °C |
| Oscillator Frequency | fOSC | 22 | 25 | 28 | kHz |
| Input Threshold Voltage (High State) | VIH | 2.2 | - | 3.0 | V |
| Input Threshold Voltage (Low State) | VIL | 0.8 | - | 1.7 | V |
Key Features
- 10 to 30 V operation range
- Undervoltage lockout
- 6.25 V reference capable of supplying sensor power
- Fully accessible error amplifier for closed-loop servo applications
- High current drivers to control external 3-phase MOSFET bridge
- Pulse width modulator comparator
- Three open collector top drive outputs and three high current totem pole bottom drive outputs
- Protective features: cycle-by-cycle current limiting with a selectable time delayed latched shutdown mode, and internal thermal shutdown
- Support for 60°/300° or 120°/240° electrical sensor phasings
- 60°/120° select pin for configuring rotor position decoder
Applications
The MC33033DWR2G is suitable for various industrial and automotive applications requiring robust and reliable brushless DC motor control. It can be used in:
- Industrial automation systems
- Automotive systems (with the NCV prefix for site and change control)
- Power tools and equipment
- Medical devices requiring precise motor control
- Consumer electronics with motorized components
Q & A
- What is the operating voltage range of the MC33033DWR2G?
The MC33033DWR2G operates within a voltage range of 10 to 30 V.
- What protective features does the MC33033DWR2G include?
The device includes undervoltage lockout, cycle-by-cycle current limiting with a selectable time delayed latched shutdown mode, and internal thermal shutdown.
- How does the rotor position decoder work in the MC33033DWR2G?
The rotor position decoder monitors the three sensor inputs to provide the proper sequencing of the top and bottom drive outputs, supporting motors with 60°/300° or 120°/240° electrical sensor phasings.
- What is the purpose of the 60°/120° select pin?
The 60°/120° select pin configures the rotor position decoder for either 60° or 120° sensor electrical phasing inputs.
- Can the MC33033DWR2G control brush DC motors?
Yes, the MC33033DWR2G can also efficiently control brush DC motors in addition to brushless DC motors.
- What is the typical oscillator frequency of the MC33033DWR2G?
The typical oscillator frequency is around 25 kHz.
- What is the maximum power dissipation at 85°C for the SO-20L package?
The maximum power dissipation at 85°C for the SO-20L package is 867 mW.
- What is the thermal resistance, junction-to-air for the SO-20L package?
The thermal resistance, junction-to-air for the SO-20L package is 75 °C/W.
- How many active transistors are in the MC33033DWR2G?
The device contains 266 active transistors.
- What is the input threshold voltage range for the logic inputs?
The input threshold voltage range for the logic inputs is typically between 0.8 V and 3.0 V.
