Overview
The MC34025DWR2 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 an ideal choice for designers seeking efficient and reliable power supply control.
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 |
| Input and Reference Undervoltage Lockout Startup Threshold (VCC Increasing) | Vth(on) | 8.8 | 9.2 | 9.6 | V |
| Operating Junction Temperature | TJ | - | - | 150 | °C |
| Operating Ambient Temperature | TA | 0 | - | 70 | °C |
| Storage Temperature Range | Tstg | -55 | - | 150 | °C |
| Reference Output Voltage (IO = 1.0 mA, TJ = +25°C) | Vref | 5.05 | 5.1 | 5.15 | V |
| Propagation Delay to Outputs | - | - | 50 ns | - | ns |
Key Features
- Dual high current totem pole outputs, capable of up to ±2.0 A peak drive current with a typical rise and fall time of 30 ns driving a 1.0 nF load.
- Wide bandwidth error amplifier with an open-loop voltage gain of 60 to 95 dB and a gain bandwidth product of 4.0 to 8.3 MHz.
- Fully-latched logic with double pulse suppression and latching PWM for cycle-by-cycle current limiting.
- Temperature compensated reference output of 5.1 V with an initial accuracy of ±1.0% at 25°C.
- Input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering.
- Flexible configuration for either current mode or voltage mode control.
- Separate pins for VC and power ground, allowing for reduced switching transient noise and independent drive voltage tailoring.
- Soft-start capability with a “hiccup” mode of recovery for output short circuits.
Applications
The MC34025DWR2 is specifically designed for off-line and DC-to-DC converter applications. It is suitable for a variety of power supply designs, including:
- Off-line power supplies.
- DC-to-DC converters.
- High-frequency switching power supplies.
- Applications requiring minimal external components and high reliability.
Q & A
- What is the primary function of the MC34025DWR2?
The MC34025DWR2 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 MC34025DWR2?
The maximum power supply voltage (VCC) is 30 V.
- What is the output current capability of the MC34025DWR2?
The output current capability is up to ±2.0 A peak drive current.
- What is the typical propagation delay to outputs?
The typical propagation delay to outputs is 50 ns.
- Does the MC34025DWR2 support both current and voltage mode control?
Yes, the MC34025DWR2 can be easily configured for either current mode or voltage mode control.
- What protective features are included in the MC34025DWR2?
The IC includes input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering.
- What is the operating ambient temperature range for the MC34025DWR2?
The operating ambient temperature range is 0 to 70°C.
- What is the storage temperature range for the MC34025DWR2?
The storage temperature range is -55 to 150°C.
- How is the oscillator frequency programmed in the MC34025DWR2?
The oscillator frequency is programmed by the values selected for the timing components RT and CT.
- What is the reference output voltage of the MC34025DWR2?
The reference output voltage is 5.1 V with an initial accuracy of ±1.0% at 25°C.
