Overview
The MC44608P75 is a high-performance voltage mode controller designed by ON Semiconductor for off-line converters. This device integrates a startup current source and an oscillator capacitor, requiring few external components while offering high flexibility and reliability. It features a very high efficiency standby management through an effective Pulsed Mode operation, reducing standby power consumption to approximately 1.0 W while delivering 300 mW in a 150 W SMPS.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Total Power Supply Current | ICC | - | 30 | - | mA |
| Output Supply Voltage with Respect to Ground | VCC | - | - | 16 | V |
| Line Voltage Absolute Rating | Vi | - | - | 500 | V |
| Recommended Line Voltage Operating Condition | Vi | - | - | 400 | V |
| Maximum Power Dissipation at TA = 85°C | PD | - | - | 600 | mW |
| Thermal Resistance, Junction-to-Air | RθJA | - | - | 100 | °C/W |
| Operating Junction Temperature | TJ | - | - | 150 | °C |
| Operating Ambient Temperature | TA | -25 | - | 85 | °C |
| Switching Frequency | fosc | 68 | 75 | 82 | kHz |
| Maximum Duty Cycle @ f = fosc | dmax | 78 | 82 | 86 | % |
Key Features
- Integrated Startup Current Source
- Lossless Off-Line Startup
- Direct Off-Line Operation
- Fast Startup
- Flexibility
- Duty Cycle Control
- Undervoltage Lockout with Hysteresis
- On Chip Oscillator with Switching Frequency of 75 kHz
- Secondary Control with Few External Components
- Pb-Free Devices
- Maximum Duty Cycle Limitation
- Cycle by Cycle Current Limitation
- Demagnetization (Zero Current Detection) Protection
- Over VCC Protection Against Open Loop
- Programmable Low Inertia Over Voltage Protection
- Internal Thermal Protection
- Pulsed Mode Techniques for High Efficiency in Low Power Mode
- Low dV/dT for Low EMI Radiations
Applications
The MC44608P75 is suitable for various off-line converter applications, including:
- Switch Mode Power Supplies (SMPS)
- High Efficiency Standby Power Supplies
- Multiple Output Power Supplies
- Consumer Electronics
- Industrial Power Supplies
- Telecommunication Equipment
Q & A
- What is the primary function of the MC44608P75?
The MC44608P75 is a high-performance voltage mode controller designed for off-line converters.
- What are the switching frequencies available for the MC44608P75?
The MC44608P75 operates at a switching frequency of 75 kHz.
- What is the maximum power dissipation at TA = 85°C?
The maximum power dissipation at TA = 85°C is 600 mW.
- What is the operating ambient temperature range for the MC44608P75?
The operating ambient temperature range is -25°C to +85°C.
- Does the MC44608P75 have built-in protection features?
Yes, it includes protections such as Maximum Duty Cycle Limitation, Cycle by Cycle Current Limitation, Demagnetization Protection, and Over VCC Protection.
- How does the MC44608P75 manage standby power consumption?
The device features Pulsed Mode operation, reducing standby power consumption to approximately 1.0 W while delivering 300 mW in a 150 W SMPS.
- What is the purpose of the integrated startup current source?
The integrated startup current source enables lossless off-line startup and fast startup capabilities.
- Can the MC44608P75 be used in multiple output power supplies?
Yes, it is suitable for multiple output power supplies due to its secondary control with few external components.
- Is the MC44608P75 Pb-Free?
Yes, the MC44608P75 is a Pb-Free device.
- What is the thermal resistance, junction-to-air for the MC44608P75?
The thermal resistance, junction-to-air is 100 °C/W.
