Overview
The MC33363ADWR2 is a high voltage switching regulator integrated circuit produced by onsemi. This monolithic device is specifically designed to operate from a rectified 240 Vac line source, making it suitable for high-voltage applications. The MC33363ADWR2 features an on-chip 700 V / 1.5 A SENSEFET power switch, a 500 V active off-line startup FET, and various protective and control circuitries. It is available in a 16-lead SOIC-16WB package, which is Pb-free and suitable for surface mount applications.
Key Specifications
| Characteristic | Symbol | Value | Unit |
|---|---|---|---|
| Power Switch Drain Voltage | VDS | 700 | V |
| Power Switch Drain Current | IDS | 1.5 | A |
| Startup Input Voltage | Vin | 500 | V |
| Power Supply Voltage | VCC | 40 | V |
| Oscillator Frequency (CT = 390 pF, TJ = 25°C) | fOSC | 260 kHz | kHz |
| Line Regulation (VCC = 20 V to 40 V) | Regline | 30 mV | mV |
| Load Regulation (IO = 0 mA to 10 mA) | Regload | 44 mV | mV |
| Total Output Variation over Line, Load, and Temperature | Vreg | 5.3 V to 8.0 V | V |
| Thermal Shutdown Temperature | Tj | 155°C | °C |
Key Features
- On-Chip 700 V, 1.5 A SENSEFET Power Switch: Capable of switching high voltages and currents.
- Rectified 240 Vac Line Source Operation: Designed to operate directly from a rectified AC line source.
- On-Chip 500 V Active Off-Line Startup FET: Enhances startup efficiency by eliminating the need for an external startup resistor.
- Duty Cycle Controlled Oscillator: Allows for adjustable oscillator frequency using external components RT and CT.
- Current Limiting Comparator with Programmable Threshold and Leading Edge Blanking: Prevents premature reset of the PWM latch and ensures reliable current limiting.
- High Gain Error Amplifier: Features a typical dc voltage gain of 82 dB and a unity gain bandwidth of 1.0 MHz.
- Thermal Shutdown and Protective Features: Includes cycle-by-cycle current limiting, input undervoltage lockout with hysteresis, output overvoltage protection, and thermal shutdown.
- Low Current 6.5 V Regulated Output: Available for biasing external circuitry with short-circuit protection.
Applications
The MC33363ADWR2 is suitable for various high-voltage power supply applications, including:
- Flyback and Forward Converters: Ideal for designing efficient and reliable high-voltage DC-DC converters.
- Offline Power Supplies: Used in power supplies that operate directly from the AC line voltage.
- Industrial Power Systems: Suitable for industrial applications requiring high voltage and current handling.
- Consumer Electronics: Can be used in consumer electronics that require efficient and reliable power management.
Q & A
- What is the maximum drain voltage of the MC33363ADWR2 power switch?
The maximum drain voltage of the MC33363ADWR2 power switch is 700 V.
- How does the MC33363ADWR2 handle startup from a rectified AC line source?
The MC33363ADWR2 uses an on-chip 500 V active off-line startup FET to supply internal bias and charge the VCC bypass capacitor during startup.
- What is the typical oscillator frequency of the MC33363ADWR2?
The typical oscillator frequency is 260 kHz when CT = 390 pF and TJ = 25°C.
- What protective features are included in the MC33363ADWR2?
The device includes cycle-by-cycle current limiting, input undervoltage lockout with hysteresis, output overvoltage protection, and thermal shutdown.
- What is the thermal shutdown temperature of the MC33363ADWR2?
The thermal shutdown temperature is typically 155°C.
- How does the Leading Edge Blanking circuit function in the MC33363ADWR2?
The Leading Edge Blanking circuit prevents premature reset of the PWM latch by masking the current signal until the Power Switch turn-on transition is completed.
- What is the typical dc voltage gain of the error amplifier in the MC33363ADWR2?
The typical dc voltage gain of the error amplifier is 82 dB.
- What is the purpose of the 6.5 V regulated output in the MC33363ADWR2?
The 6.5 V regulated output is available for biasing external circuitry and requires an external bypass capacitor for stability.
- What package options are available for the MC33363ADWR2?
The MC33363ADWR2 is available in a 16-lead SOIC-16WB package, which is Pb-free and suitable for surface mount applications.
- What are some common applications of the MC33363ADWR2?
The MC33363ADWR2 is commonly used in flyback and forward converters, offline power supplies, industrial power systems, and consumer electronics requiring high-voltage power management.
