Overview
The MC33025DW, produced by onsemi, is a high-speed, fixed-frequency, double-ended pulse width modulator (PWM) controller. It is optimized for high-frequency operation and is specifically designed for off-line and DC-to-DC converter applications. This integrated circuit offers a cost-effective solution with minimal external components, making it an ideal choice for designers seeking efficient and reliable power management solutions.
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 (DC) | IO | - | - | 0.5 A | A |
| Output Current, Source or Sink (Pulsed 0.5 μs) | IO | - | - | 2.0 A | A |
| Operating Junction Temperature | TJ | - | - | +150 | °C |
| Operating Ambient Temperature | TA | -40 | - | +105 | °C |
| Reference Output Voltage (IO = 1.0 mA, TJ = +25°C) | Vref | 5.05 | 5.1 | 5.15 | V |
| Propagation Delay (Current Limit/Shutdown to Output, TJ = +25°C) | tPLH(in/out) | - | 50 | 80 | 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
- 50 ns propagation delay to outputs
- Temperature compensated reference (5.1 V bandgap reference)
- Input and reference undervoltage lockouts with hysteresis
- Soft-start capability with hiccup mode recovery for output short circuits
Applications
The MC33025DW is specifically designed for off-line and DC-to-DC converter applications. It is suitable for use in:
- Off-line power supplies
- DC-to-DC converters
- High-frequency switching power supplies
- Power management systems requiring high efficiency and reliability
Q & A
- What is the primary function of the MC33025DW?
The MC33025DW 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 MC33025DW?
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.
- Does the MC33025DW have protective features?
Yes, it 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 MC33025DW?
The oscillator frequency is programmed by the values selected for the timing components RT and CT.
- What is the purpose of the soft-start feature in the MC33025DW?
The soft-start feature helps in gradual startup and includes a hiccup mode recovery for output short circuits.
- Can the MC33025DW be configured for both current mode and voltage mode control?
Yes, the MC33025DW can be easily configured for either current mode or voltage mode control.
- What is the operating ambient temperature range for the MC33025DW?
The operating ambient temperature range is from -40°C to +105°C.
- Does the MC33025DW have a temperature compensated reference?
Yes, it features a 5.1 V bandgap reference that is temperature compensated.
- What is the maximum output current of the MC33025DW?
The maximum output current (source or sink) is 2.0 A (pulsed 0.5 μs).
