Overview
The MC33025DWR2G is a high-speed, fixed-frequency, double-ended pulse width modulator (PWM) controller produced by ON Semiconductor. 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 ideal for a variety of power supply designs.
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 | |
| Propagation Delay (Current Limit/Shutdown to Output) | tPLH(in/out) | 50 | 80 | ns | |
| Output Voltage Rise Time (CL = 1.0 nF) | tr | 30 | 60 | ns | |
| Output Voltage Fall Time (CL = 1.0 nF) | tf | 30 | 60 | ns |
Key Features
- High-speed, fixed-frequency operation
- Dual high current totem pole outputs for direct drive of power MOSFETs
- Wide bandwidth error amplifier
- Fully-latched logic with double pulse suppression
- Latching PWM for cycle-by-cycle current limiting
- Input and reference undervoltage lockouts with hysteresis
- 50 ns propagation delay to outputs
- Separate pins for VC and Power Ground to reduce switching transient noise
- 5.1 V bandgap reference with short circuit protection
- Soft-start capability with hiccup mode recovery for output short circuits
Applications
- Off-line and DC-to-DC converter applications
- High-frequency power supply designs
- Switch-mode power supplies
- Power MOSFET drivers
- High-efficiency power conversion systems
Q & A
- What is the primary function of the MC33025DWR2G?
The MC33025DWR2G is a high-speed, fixed-frequency, double-ended pulse width modulator (PWM) controller designed for off-line and DC-to-DC converter applications.
- What is the maximum power supply voltage for the MC33025DWR2G?
The maximum power supply voltage (VCC) is 30 V.
- What is the typical propagation delay to the outputs?
The typical propagation delay to the outputs is 50 ns.
- What protective features does the MC33025DWR2G include?
The IC includes input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering.
- How is the oscillator frequency programmed in the MC33025DWR2G?
The oscillator frequency is programmed by the values selected for the timing components RT and CT.
- What is the purpose of the separate VC supply input?
The separate VC supply input allows the designer to tailor the drive voltage independent of VCC and reduces switching transient noise imposed on the control circuitry.
- What is the typical output current capability of the totem pole outputs?
The totem pole outputs are capable of up to ±2.0 A peak drive current.
- What is the operating ambient temperature range for the MC33025DWR2G?
The operating ambient temperature range is from -40°C to +105°C.
- Does the MC33025DWR2G have a soft-start feature?
Yes, it includes a soft-start capability with hiccup mode recovery for output short circuits.
- What is the reference output voltage of the MC33025DWR2G?
The reference output voltage is 5.1 V with an initial accuracy of ±1.0% at 25°C.
