Overview
The MC33364D2R2, produced by onsemi, is a variable-frequency SMPS (Switch-Mode Power Supply) controller designed for high-density power supplies. It operates in the critical conduction mode, which offers several advantages including reduced switching losses, lower EMI, and the ability to use less expensive components. This device is part of the MC33364 series, which integrates high voltage startup and protection circuitry, making it suitable for off-line flyback converters in modern consumer electronic power supplies.
The MC33364D2R2 is particularly useful for applications requiring universal input voltage from 85 Vac to 265 Vac without additional startup circuits or components. It features an internal 700 V Very High-Voltage (VHV) startup circuit, which simplifies the design process and reduces component count.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Reference Output Voltage (IOut = 0 mA, TJ = 25°C) | Vref | 4.90 | 5.05 | 5.20 | V |
| Line Regulation (VCC = 10 V to 20 V) | Regline | % | |||
| Feedback Pin to Output Delay | tDLY | 100 | 232 | 400 | ns |
| Source Resistance (Drive = 0 V, VGate = VCC − 1.0 V) | ROH | 10 | 36 | 70 | kΩ |
| Sink Resistance (Drive = VCC, VGate = 1.0 V) | kΩ | ||||
| Operating Temperature Range | -25°C | 125°C | °C | ||
| Maximum Operating Current | 1.15V / Rsense | A | |||
| Switching Frequency | Up to 126 kHz (adjustable) | kHz |
Key Features
- Lossless Off-Line Startup: Integrates a high voltage startup circuit, eliminating the need for external startup networks.
- Leading Edge Blanking for Noise Immunity: Enhances reliability by reducing the impact of noise on the switching operation.
- Watchdog Timer to Initiate Switching: Ensures the SMPS starts switching under proper conditions.
- Operating Temperature Range: Operates from -25°C to +125°C, making it suitable for a wide range of environments.
- Shutdown Capability and Over Temperature Protection: Provides robust protection mechanisms to ensure safe operation.
- Optional/Adjustable Frequency Clamp: Limits EMI and allows for customization of the switching frequency.
- Pb-Free and Halide-Free Device: Compliant with environmental regulations.
- Critical Conduction Mode Operation: Reduces switching losses and EMI, and limits peak MOSFET drain current.
- Zero Current Detector and Current Sensing Comparator: Ensures critical conduction operation and cycle-by-cycle current limiting.
Applications
The MC33364D2R2 is designed for use in various high-density power supply applications, including:
- Consumer Electronic Power Supplies: Suitable for universal input voltage from 85 Vac to 265 Vac.
- Flyback Converters: Ideal for critical conduction mode flyback switching power supplies.
- Battery Chargers: Can be used in battery charger applications requiring efficient and reliable power conversion.
- General Power Supplies: Applicable in any scenario where high efficiency, low EMI, and compact design are essential.
Q & A
- What is the operating temperature range of the MC33364D2R2?
The operating temperature range is from -25°C to +125°C.
- Does the MC33364D2R2 have an internal frequency clamp?
No, the MC33364D2R2 does not have an internal frequency clamp, unlike the MC33364D1 and MC33364D models.
- What is the purpose of the watchdog timer in the MC33364D2R2?
The watchdog timer ensures that the SMPS starts switching under proper conditions, adding a layer of reliability to the operation.
- How does the critical conduction mode benefit the SMPS operation?
The critical conduction mode reduces switching losses, limits peak MOSFET drain current, and minimizes EMI, making the SMPS more efficient and reliable.
- Is the MC33364D2R2 Pb-Free and Halide-Free?
- What is the maximum operating current of the MC33364D2R2?
The maximum operating current is limited to 1.15V / Rsense.
- Can the MC33364D2R2 be used in battery charger applications?
- What is the typical reference output voltage of the MC33364D2R2?
The typical reference output voltage is 5.05 V.
- Does the MC33364D2R2 have over temperature protection?
- What is the significance of the leading edge blanking feature?
The leading edge blanking feature enhances noise immunity, ensuring more reliable switching operations.
