Overview
The MC33033DWR2, produced by ON Semiconductor, is a high-performance, second-generation, monolithic brushless DC motor controller. 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 MC33033DWR2 includes a rotor position decoder, a temperature-compensated reference, 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
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage | VCC | - | - | 30 | V |
| Reference Output Voltage | Vref | 5.9 | 6.24 | 6.57 | V |
| Oscillator Frequency | fOSC | 22 | 25 | 28 | kHz |
| Top Drive Output Sink Current | ISink(top) | - | - | 50 | mA |
| Bottom Drive Output Current | IDRV | - | - | 100 | mA |
| Operating Junction Temperature | TJ | -40 | - | 150 | °C |
| Operating Ambient Temperature Range | TA | -40 | - | 85 | °C |
Key Features
- Operates from 10 to 30 V
- 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
- Frequency-programmable sawtooth oscillator
- Pulse width modulator comparator
- Three open collector top drive outputs and three high current totem pole bottom drive outputs
- Cycle-by-cycle current limiting with a selectable time-delayed latched shutdown mode
- Internal thermal shutdown
- 60°/120° select pin for configuring rotor position decoder
Applications
The MC33033DWR2 is suitable for various applications involving brushless DC motors and brush DC motors. It is particularly useful in industrial environments due to its ruggedness and high performance. Common applications include:
- Industrial automation and control systems
- Automotive systems (especially with the NCV prefix for site and change control)
- Power tools and equipment
- Medical devices requiring precise motor control
- Aerospace and defense systems
Q & A
- What is the operating voltage range of the MC33033DWR2?
The MC33033DWR2 operates from 10 to 30 V.
- What protective features does the MC33033DWR2 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 MC33033DWR2?
The rotor position decoder monitors the three sensor inputs to provide the proper sequencing of the top and bottom drive outputs, supporting 60°/120°/240°/300° electrical sensor phasing.
- 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 MC33033DWR2 control brush DC motors?
Yes, the MC33033DWR2 can also efficiently control brush DC motors in addition to brushless DC motors.
- What is the typical oscillator frequency of the MC33033DWR2?
The typical oscillator frequency is 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.
- How many active transistors are in the MC33033DWR2?
The device contains 266 active transistors.
- What is the storage temperature range for the MC33033DWR2?
The storage temperature range is from -65°C to +150°C.
- Is the MC33033DWR2 suitable for automotive applications?
Yes, especially with the NCV prefix, which is designed for automotive and other applications requiring site and change control.
