Overview
The MC33025DWG, produced by onsemi, is a high-speed, fixed-frequency, double-ended pulse width modulator (PWM) controller. This integrated circuit is optimized for high-frequency operation and is specifically designed for off-line and DC-to-DC converter applications. It offers a cost-effective solution with minimal external components, making it an ideal choice for power supply designs. The MC33025DWG features an oscillator, a temperature-compensated reference, a wide bandwidth error amplifier, a high-speed current sensing comparator, and dual high-current totem pole outputs suitable for driving power MOSFETs.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage | VCC | - | - | 30 | V |
| Output Driver Supply Voltage | VC | - | - | 25 | V |
| Output Current, Source or Sink | IO | 0.5 | - | 2.0 | A |
| Reference Output Voltage | Vref | 5.05 | 5.1 | 5.15 | V |
| Startup Threshold (VCC Increasing) | Vth(on) | 8.8 | 9.2 | 9.6 | V |
| UVLO Hysteresis Voltage (VCC Decreasing After Turn-On) | VH | 0.4 | 0.8 | 1.2 | V |
| Operating Junction Temperature | TJ | - | - | 150 | °C |
| Operating Ambient Temperature | TA | -40 | - | 105 | °C |
| Storage Temperature Range | Tstg | -55 | - | 150 | °C |
Key Features
- High-speed, fixed-frequency operation
- Dual high-current totem pole outputs for driving power MOSFETs
- Wide bandwidth error amplifier
- Temperature-compensated reference with short circuit protection
- 50 ns propagation delay to outputs
- Fully-latched logic with double pulse suppression
- Latching PWM for cycle-by-cycle current limiting
- Input and reference undervoltage lockouts with hysteresis
- Soft-start capability with hiccup mode recovery for output short circuits
- Separate pins for VC and Power Ground to reduce switching transient noise
Applications
The MC33025DWG is designed for use in off-line and DC-to-DC converter applications. It is particularly suitable for:
- Switch-mode power supplies
- High-frequency DC-to-DC converters
- Power factor correction circuits
- Motor control and drive systems
- Other high-power, high-frequency switching applications
Q & A
- What is the primary function of the MC33025DWG?
The MC33025DWG is a high-speed, fixed-frequency, double-ended pulse width modulator controller designed for off-line and DC-to-DC converter applications.
- What is the maximum power supply voltage for the MC33025DWG?
The maximum power supply voltage (VCC) is 30 V.
- What is the typical reference output voltage of the MC33025DWG?
The typical reference output voltage (Vref) is 5.1 V.
- What is the propagation delay to the outputs of the MC33025DWG?
The propagation delay to the outputs is typically 50 ns.
- Does the MC33025DWG have undervoltage lockout protection?
Yes, it has input and reference undervoltage lockouts with hysteresis.
- What is the purpose of the soft-start feature in the MC33025DWG?
The soft-start feature helps in gradually increasing the output voltage during startup, preventing large inrush currents and potential damage to the system.
- Can the MC33025DWG be used in current mode or voltage mode control?
Yes, the MC33025DWG can be easily configured for either current mode or voltage mode control.
- What is the maximum operating ambient temperature for the MC33025DWG?
The maximum operating ambient temperature (TA) is 105°C.
- Does the MC33025DWG have separate pins for VC and Power Ground?
Yes, it has separate pins for VC and Power Ground to reduce switching transient noise.
- What is the typical output current capability of the MC33025DWG's totem pole outputs?
The totem pole outputs can source or sink up to ±2.0 A peak drive current.
- How does the MC33025DWG handle output short circuits?
The MC33025DWG features a hiccup mode recovery for output short circuits, which helps in protecting the system during such events.
