Overview
The MC34025DWR2G is a high-speed, fixed-frequency, double-ended pulse width modulator (PWM) controller designed by ON Semiconductor. This component is optimized for high-frequency operation and is specifically tailored for Off-Line and DC-to-DC converter applications. It offers a cost-effective solution with minimal external components required, making it ideal for demanding industrial processes. The controller features an integrated 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
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Status | Obsolete | Compliance | PbAHP |
| Case Outline | 751G-03 | MSL Type | 3 |
| MSL Temp (°C) | 260 | Container Type | REEL |
| Container Qty. | 1000 | ON Target | N |
| Topology | Push-Pull | Control Mode | Current/Voltage Mode |
| fsw Typ (kHz) | 1000 | Stand-by Mode | No |
| UVLO (V) | Yes | Short Circuit Protection | Yes |
| Latch | No | VCC Max (V) | 30 |
| Drive Cap. (mA) | 200 / 200 | ||
| Power Supply Voltage (VCC) | 30 V | Output Driver Supply Voltage (VC) | 25 V |
| Output Current, Source or Sink | 0.5 A (DC), 2.0 A (Pulsed) | Operating Junction Temperature | +150°C |
| Operating Ambient Temperature | 0 to +70°C | Storage Temperature Range | -55 to +150°C |
Key Features
- High Accuracy Reference: Internally trimmed reference with an initial accuracy of ±1.0% at 25°C.
- Programmable Frequency Divider: The oscillator frequency is programmed by the values selected for the timing components RT and CT.
- Synch Lockout with Hysteresis: Prevents synchronization with noise or unwanted signals.
- 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: Suitable for compensating the error amp for poles and zeros encountered in the power supply system.
- Fully-Latched Logic with Double Pulse Suppression: Ensures reliable operation by suppressing double pulses.
- Latching PWM for Cycle-By-Cycle Current Limiting: Provides cycle-by-cycle current limiting and soft-start control with latched overcurrent reset.
- Input and Reference Undervoltage Lockout with Hysteresis: Protects the device from undervoltage conditions with hysteresis.
- Low Startup Current: Typical startup current is 500 μA.
- Voltage or Current Mode Operation: Can be configured for either current mode or voltage mode control up to 1.0 MHz.
Applications
The MC34025DWR2G is designed for a wide range of applications, including:
- Off-Line Converters: Suitable for high-frequency off-line power supply applications.
- DC-to-DC Converters: Ideal for DC-to-DC converter applications requiring high-speed and high-frequency operation).
- Industrial Power Supplies: Used in demanding industrial processes where precise control and high reliability are necessary).
Q & A
- What is the typical switching frequency of the MC34025DWR2G?
The typical switching frequency is 1000 kHz, which can be programmed using the timing components RT and CT).
- What are the key features of the MC34025DWR2G's outputs?
The outputs are 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).
- Does the MC34025DWR2G support both voltage and current mode operation?
Yes, it can be configured for either current mode or voltage mode control up to 1.0 MHz).
- What protective features are included in the MC34025DWR2G?
The device includes input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering).
- What is the maximum power supply voltage for the MC34025DWR2G?
The maximum power supply voltage (VCC) is 30 V, and the output driver supply voltage (VC) is 25 V).
- What is the operating junction temperature range for the MC34025DWR2G?
The operating junction temperature range is from -40°C to +150°C).
- Does the MC34025DWR2G have short circuit protection?
Yes, it includes short circuit protection and cycle-by-cycle current limiting).
- What is the typical startup current of the MC34025DWR2G?
The typical startup current is 500 μA).
- Can the MC34025DWR2G be used in high-frequency applications?
Yes, it is optimized for high-frequency operation and is suitable for applications requiring high-speed PWM control).
- What package type is the MC34025DWR2G available in?
The MC34025DWR2G is available in a SOIC-16W package).
