Overview
The MC33364D1 is a variable frequency Switch-Mode Power Supply (SMPS) controller produced by Onsemi. It operates in the critical conduction mode and is optimized for high-density power supplies that require minimal board area, reduced component count, and low power dissipation. This controller integrates a high-voltage startup circuit, which saves approximately 0.7 W of power compared to resistor bootstrapped circuits. It is designed for off-line flyback converters and supports universal input voltages from 85 Vac to 265 Vac without additional startup components.
Key Specifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Series | GreenLine™ | Output Isolation | Isolated |
| Internal Switch(s) | No | Voltage - Breakdown | 700V |
| Topology | Flyback | Voltage - Start Up | 15 V |
| Voltage - Supply (Vcc/Vdd) | 7.6V ~ 16V | Frequency - Switching | 126kHz |
| Fault Protection | Current Limiting, Over Temperature | Operating Temperature | -25°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Package/Case | SO-8 (Pb-Free) |
Key Features
- Lossless Off-Line Startup
- Leading Edge Blanking for Noise Immunity
- Watchdog Timer to Initiate Switching
- Operating Temperature Range: -25°C to +125°C
- Shutdown Capability
- Over Temperature Protection
- Optional/Adjustable Frequency Clamp to Limit EMI
- Pb-Free and Halide-Free Device
Applications
The MC33364D1 is commonly used in various consumer electronic power supplies, including universal input voltage applications from 85 Vac to 265 Vac. It is suitable for high-density power supplies requiring minimal board area and low power dissipation. Typical applications include battery chargers, cellular phone power supplies, and other off-line flyback converters where critical conduction mode operation is beneficial.
Q & A
- Q: What is the operating temperature range of the MC33364D1?
A: The operating temperature range is -25°C to +125°C.
- Q: What is the switching frequency of the MC33364D1?
A: The MC33364D1 has an internal 126 kHz frequency clamp.
- Q: Does the MC33364D1 have over temperature protection?
A: Yes, the MC33364D1 includes over temperature protection.
- Q: What is the voltage breakdown rating of the MC33364D1?
A: The voltage breakdown rating is 700V.
- Q: Is the MC33364D1 Pb-Free and Halide-Free?
A: Yes, the MC33364D1 is a Pb-Free and Halide-Free device.
- Q: What is the typical application of the MC33364D1?
A: It is typically used in off-line flyback converters and battery chargers.
- Q: How does the MC33364D1 save power compared to traditional startup circuits?
A: The MC33364D1 saves approximately 0.7 W of power by integrating a high-voltage startup circuit, eliminating the need for an external startup network.
- Q: What package types are available for the MC33364D1?
A: The MC33364D1 is available in SO-8 (Pb-Free) packages.
- Q: Does the MC33364D1 have a watchdog timer?
A: Yes, the MC33364D1 includes a watchdog timer to initiate output switching.
- Q: What is the purpose of the zero current detector in the MC33364D1?
A: The zero current detector ensures critical conduction operation, reducing switching losses and EMI.
