Overview
The MC33067P, produced by onsemi, is a high-performance zero voltage switch resonant mode controller. It is designed for off-line and DC-to-DC converter applications that utilize frequency modulated constant off-time or constant deadtime control. This integrated circuit features advanced components such as a variable frequency oscillator, a precise retriggerable one-shot timer, a temperature-compensated reference, a high-gain wide bandwidth error amplifier, and dual high-current totem pole outputs. These outputs are ideally suited for driving power MOSFETs. The device also includes protective features like a high-speed fault comparator and latch, programmable soft-start circuitry, input undervoltage lockout with selectable thresholds, and reference undervoltage lockout. The MC33067P is available in dual-in-line and surface mount packages, making it versatile for various applications.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Output Voltage (IO = 0 mA, TJ = 25°C) | 5.0 | 5.1 | 5.2 | V |
| Line Regulation (VCC = 10 V to 18 V) | -1.0 | - | 20 | mV |
| Load Regulation (IO = 0 mA to 10 mA) | -1.0 | - | 20 | mV |
| Oscillator Frequency (Error Amp Output Low) | 490 | 525 | 550 | kHz |
| Oscillator Frequency (Error Amp Output High) | 1850 | 2050 | 2200 | kHz |
| One-Shot Drive Output Off-Time | 235 | 250 | 270 | ns |
| Output Voltage Low State (ISink = 20 mA) | 0.8 | - | 1.2 | V |
| Output Voltage High State (ISource = 20 mA) | 9.0 | - | 10.3 | V |
| Operating Junction Temperature | -40 | - | 85 | °C |
| Storage Temperature | -55 | - | 150 | °C |
Key Features
- Zero Voltage Switch Resonant Mode Operation
- Variable Frequency Oscillator with a control range exceeding 1000:1
- Precision One-Shot Timer for Controlled Off-Time
- Internally Trimmed Bandgap Reference
- 4.0 MHz Error Amplifier
- Dual High Current Totem Pole Outputs
- Selectable Undervoltage Lockout Thresholds with Hysteresis
- Enable Input
- Programmable Soft-Start Circuitry
- Low Startup Current for Off-Line Operation
- Pb-Free, Halogen Free/BFR Free, and RoHS Compliant
Applications
The MC33067P is designed for use in off-line and DC-to-DC converter applications. It is particularly suited for resonant mode power supplies, which offer benefits such as lower switching losses, higher efficiency, lower EMI emission, and smaller size. This controller is ideal for applications requiring precise control over the switching frequency and off-time, such as in high-performance power supplies, automotive systems, and other applications requiring AEC-Q100 qualified components.
Q & A
- What is the primary function of the MC33067P?
The MC33067P is a high-performance zero voltage switch resonant mode controller designed for off-line and DC-to-DC converter applications.
- What types of packages are available for the MC33067P?
The device is available in dual-in-line and surface mount packages.
- What is the range of the variable frequency oscillator?
The variable frequency oscillator has a control range exceeding 1000:1.
- What protective features are included in the MC33067P?
The device includes a high-speed fault comparator and latch, programmable soft-start circuitry, input undervoltage lockout with selectable thresholds, and reference undervoltage lockout.
- What is the operating junction temperature range for the MC33067P?
The operating junction temperature range is from -40°C to 85°C.
- Is the MC33067P RoHS compliant?
- What is the purpose of the one-shot timer in the MC33067P?
The one-shot timer is used for controlled off-time in the switching operation.
- How does the error amplifier function in the MC33067P?
The error amplifier monitors the output of the regulator and modulates the frequency of the oscillator.
- What are the benefits of using resonant mode control in power supplies?
Resonant mode control offers lower switching losses, higher efficiency, lower EMI emission, and smaller size.
- Is the MC33067P suitable for automotive applications?
