Overview
The MC33368DR2G is an active power factor controller designed by onsemi, optimized for use in off-line power supply applications. This device functions as a boost preconverter, enhancing power factor correction in low power, high density power supplies. It is particularly suited for applications requiring minimal board area, reduced component count, and low power dissipation. The MC33368DR2G is packaged in a narrow body SOIC-16, providing a small footprint and is Pb-Free, aligning with environmental regulations.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage (Transient) | VCC | -1.0 | - | 20 | V |
| Zero Current Detect Input | Iin | -5.0 | - | 5.0 | mA |
| Restart Diode Current | Iin | - | - | 5.0 | mA |
| Storage Temperature Range | Tstg | -55 | - | 150 | °C |
| Input Bias Current (VFB = 5.0 V) | IIB | - | 0 | 1.0 | μA |
| Input Offset Voltage (VComp = 3.0 V) | VIO | - | - | 50 | mV |
| Transconductance (VComp = 3.0 V) | gm | 30 | 51 | 80 | μmho |
| Line Operating Current (VCC = Vth(on), VLine = 50 V) | IOP | 3.0 | 12.9 | 20 | mA |
| VCC Dynamic Operating Current (50 kHz, CL = 1.0 nF) | ICC | - | - | 8.5 | mA |
| Line Pin Leakage (VLine = 500 V) | ILine | - | - | 80 | μA |
Key Features
- Lossless Off-Line Startup: Reduces power consumption by approximately 0.7 W compared to resistor bootstrapped circuits.
- Output Overvoltage Comparator: Minimizes overshoot and protects the system from overvoltage conditions.
- Leading Edge Blanking (LEB) for Noise Immunity: Enhances reliability by reducing the impact of noise on the system.
- Watchdog Timer to Initiate Switching: Ensures timely initiation of output switching.
- Restart Delay Timer: Provides a delay before restarting the switching operation, helping in system stability.
- Zero Current Detector: Ensures critical conduction operation.
- Transconductance Error Amplifier: Provides precise control over the output voltage.
- Current Sensing Comparator: Monitors and controls the current levels accurately.
- 5.0 V Reference: Provides a stable voltage reference for internal operations.
- Undervoltage Lockout (UVLO) Circuit: Monitors the VCC supply voltage to ensure safe operation.
- CMOS Driver for Driving MOSFETs: Efficiently drives MOSFETs with low power consumption.
- Programmable Output Switching Frequency Clamp: Allows for adjustable switching frequency to suit different applications.
- Cycle-by-Cycle Current Limiting: Protects the system from excessive current conditions.
Applications
The MC33368DR2G is designed for use in off-line power supply applications, particularly in:
- Low power, high density power supplies.
- Power factor correction (PFC) circuits.
- Boost preconverter applications.
- Consumer electronics requiring high efficiency and reliability.
- Industrial power supplies where space and power efficiency are critical.
Q & A
- What is the primary function of the MC33368DR2G?
The MC33368DR2G functions as an active power factor controller and boost preconverter in off-line power supply applications.
- What is the package type and footprint of the MC33368DR2G?
The MC33368DR2G is packaged in a narrow body SOIC-16, providing a small footprint.
- What is the significance of the lossless off-line startup feature?
The lossless off-line startup feature reduces power consumption by approximately 0.7 W compared to resistor bootstrapped circuits.
- What protection features are included in the MC33368DR2G?
The device includes an output overvoltage comparator, restart delay timer, cycle-by-cycle current limiting, and undervoltage lockout (UVLO) circuit.
- What is the role of the watchdog timer in the MC33368DR2G?
The watchdog timer initiates output switching, ensuring timely and reliable operation.
- How does the zero current detector contribute to the operation of the MC33368DR2G?
The zero current detector ensures critical conduction operation, optimizing the efficiency and reliability of the power supply.
- What is the purpose of the 5.0 V reference in the MC33368DR2G?
The 5.0 V reference provides a stable voltage for internal operations, ensuring consistent performance.
- Can the output switching frequency be adjusted in the MC33368DR2G?
Yes, the MC33368DR2G includes a programmable output switching frequency clamp, allowing for adjustable switching frequency.
- What are the typical operating conditions for the MC33368DR2G?
The typical operating conditions include a VCC of 14.5 V and an ambient temperature of 25°C.
- Is the MC33368DR2G Pb-Free?
Yes, the MC33368DR2G is a Pb-Free device, aligning with environmental regulations.
