Overview
The MC33363ADW is a high voltage switching regulator produced by onsemi. This monolithic integrated circuit is specifically designed to operate from a rectified 240 Vac line source, making it suitable for various high-voltage applications. The device integrates all the necessary active high voltage power, control, and protection circuitry required for implementing flyback or forward converters, minimizing the need for external components. It features an on-chip 700 V / 1.5 A SENSEFET power switch, a 500 V active off-line startup FET, and various protective features such as cycle-by-cycle current limiting, input undervoltage lockout, output overvoltage protection, and thermal shutdown.
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 |
| Thermal Resistance, Junction-to-Air | R�JA | 80 | °C/W |
| Thermal Resistance, Junction-to-Case | R�JC | 15 | °C/W |
| Line Regulation (VCC = 20 V to 40 V, TJ = 25°C) | Regline | -0.6 to 5.0 | mV |
| Input Bias Current (VFB = 2.6 V) | IIB | -20 to 500 | nA |
| Open Loop Voltage Gain (TJ = 25°C) | AVOL | 82 | dB |
Key Features
- Enhanced Power Capability Over MC33363
- On-chip 700 V, 1.5 A SENSEFET Power Switch
- Rectified 240 Vac Line Source Operation
- On-chip 500 V Active Off-Line Startup FET
- Latching PWM for Double Pulse Suppression
- Cycle-by-Cycle Current Limiting
- Input Undervoltage Lockout with Hysteresis
- Output Overvoltage Protection Comparator
- Trimmed Internal Bandgap Reference
- Internal Thermal Shutdown
- Pb-Free Devices
Applications
The MC33363ADW is suitable for a variety of high-voltage applications, including:
- Flyback and forward converters
- Off-line power supplies
- High-voltage DC-DC converters
- Power supplies for industrial and consumer electronics
- Telecommunication equipment
Q & A
- What is the maximum drain voltage of the MC33363ADW power switch?
The maximum drain voltage of the MC33363ADW power switch is 700 V.
- What is the purpose of the on-chip 500 V active off-line startup FET?
The on-chip 500 V active off-line startup FET supplies internal bias and charges an external capacitor during startup, eliminating the need for an external startup resistor.
- What protective features does the MC33363ADW include?
The MC33363ADW includes cycle-by-cycle current limiting, input undervoltage lockout with hysteresis, output overvoltage protection, and internal thermal shutdown.
- How is the oscillator frequency controlled in the MC33363ADW?
The oscillator frequency is controlled by the values selected for the timing components RT and CT.
- What is the function of the Leading Edge Blanking circuit?
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?
The typical dc voltage gain of the Error Amplifier is 82 dB.
- What is the purpose of the Undervoltage Lockout (UVLO) comparator?
The UVLO comparator ensures that the integrated circuit has sufficient voltage to be fully functional before the output stage is enabled.
- What is the thermal shutdown temperature of the MC33363ADW?
The thermal shutdown temperature of the MC33363ADW is typically 155°C.
- What type of packages is the MC33363ADW available in?
The MC33363ADW is available in 16-lead dual-in-line and wide body surface mount packages.
- Is the MC33363ADW Pb-Free?
Yes, the MC33363ADW is a Pb-Free device.
