Overview
The MC33364DG is a critical conduction mode Switch-Mode Power Supply (SMPS) controller produced by onsemi. This controller is designed for high-density power supplies, minimizing board area, reducing component count, and lowering power dissipation. It features an on-board reference, Under Voltage Lockout (UVLO) function, a watchdog timer, a zero current detector, a current sensing comparator, leading edge blanking, and a CMOS driver with cycle-by-cycle current limiting. The integration of high voltage startup saves approximately 0.7 W of power compared to resistor bootstrapped circuits.
Key Specifications
| Parameter | Value |
|---|---|
| Topology | Flyback |
| Control Mode | Current Mode |
| Switching Frequency | Up to 150 kHz (adjustable) |
| Operating Temperature Range | -25°C to +125°C |
| UVLO (Under Voltage Lockout) | Yes |
| Short Circuit Protection | No |
| Soft Start | No |
| VCC Max (V) | 16 V |
| Drive Capacity (mA) | 220 / 600 mA |
| Package Type | SOIC-16 |
| MSL Type | 1 |
| MSL Temp (°C) | 260°C |
Key Features
- Lossless off-line startup, saving approximately 0.7 W of power.
- Leading edge blanking for noise immunity.
- Watchdog timer to initiate output switching.
- Zero current detector to ensure critical conduction operation.
- Current sensing comparator and CMOS driver with cycle-by-cycle current limiting.
- Optional/adjustable frequency clamp to limit EMI.
- Shutdown capability and over temperature protection.
Applications
The MC33364DG is suitable for high-density power supplies, particularly in applications requiring minimal board area and low power dissipation. It is ideal for use in various power supply designs, including flyback converters, where efficiency and reliability are critical. Typical applications include consumer electronics, industrial power supplies, and other devices requiring compact and efficient power management solutions.
Q & A
- What is the topology of the MC33364DG?
The MC33364DG operates in a flyback topology.
- What is the control mode of the MC33364DG?
The control mode is current mode.
- What is the switching frequency range of the MC33364DG?
The switching frequency can go up to 150 kHz and is adjustable.
- What is the operating temperature range of the MC33364DG?
The operating temperature range is -25°C to +125°C.
- Does the MC33364DG have Under Voltage Lockout (UVLO) protection?
Yes, it does have UVLO protection.
- Does the MC33364DG have short circuit protection?
No, it does not have short circuit protection.
- What is the maximum VCC voltage for the MC33364DG?
The maximum VCC voltage is 16 V.
- What are the drive capacities of the MC33364DG?
The drive capacities are 220 mA and 600 mA.
- In what package types is the MC33364DG available?
The MC33364DG is available in SOIC-16 packages.
- What are the key features of the MC33364DG that contribute to its efficiency?
Key features include lossless off-line startup, leading edge blanking, and an optional/adjustable frequency clamp.
