Overview
The MC33067PG is a high-performance zero voltage switch resonant mode controller designed by onsemi. This integrated circuit is tailored for off-line and DC-to-DC converter applications that utilize frequency modulated constant off-time or constant deadtime control. It features 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 suitable for driving power MOSFETs. The device also includes protective features such as a high-speed fault comparator and latch, programmable soft-start circuitry, input undervoltage lockout with selectable thresholds, and reference undervoltage lockout. The MC33067PG is available in a PDIP-16 package and is Pb-free, making it suitable for various power supply designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Power Supply Voltage (VCC) | 20 | V |
| Drive Output Current (Continuous) | 0.3 | A |
| Drive Output Current (Pulsed, 0.5 μs, 25% Duty Cycle) | 1.5 | A |
| Error Amplifier Input Offset Voltage | -1.0 to 10 | mV |
| Error Amplifier Gain Bandwidth Product | 3.0 to 5.0 | MHz |
| Oscillator Frequency (Error Amp Output Low) | 490 to 550 | kHz |
| Oscillator Frequency (Error Amp Output High) | 1850 to 2200 | kHz |
| Reference Output Voltage | 5.0 to 5.2 | V |
| Operating Junction Temperature | -40 to +85 | °C |
| Operating Ambient Temperature | 0 to +70 | °C |
| Storage Temperature | -55 to +150 | °C |
| Package Type | PDIP-16 |
Key Features
- Zero Voltage Switch Resonant Mode Operation
- Variable Frequency Oscillator with a control range exceeding 1000:1
- Precision Retriggerable 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 Packages Available
- High-Speed Fault Comparator and Latch
Applications
The MC33067PG is designed for use in off-line and DC-to-DC converter applications. It is particularly suited for:
- Resonant mode power supplies, which benefit from lower switching losses, higher efficiency, lower EMI emission, and smaller size.
- Frequency modulated constant off-time or constant deadtime control systems.
- Power supply designs requiring high-performance and reliable operation.
Q & A
- What is the primary function of the MC33067PG?
The MC33067PG 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 MC33067PG?
The MC33067PG is available in a PDIP-16 package.
- What is the operating voltage range for the MC33067PG?
The power supply voltage (VCC) range is up to 20 V.
- What are the key protective features of the MC33067PG?
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 significance of the variable frequency oscillator in the MC33067PG?
The variable frequency oscillator has a control range exceeding 1000:1, which is crucial for precise controller performance at high operating frequencies.
- How does the MC33067PG handle system startup?
The device features programmable soft-start circuitry to ensure safe and controlled system startup.
- 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.
- What is the operating junction temperature range for the MC33067PG?
The operating junction temperature range is -40°C to +85°C.
- Is the MC33067PG Pb-free?
- What is the role of the error amplifier in the MC33067PG?
The error amplifier monitors the output of the regulator and modulates the frequency of the oscillator.
