Overview
The ALTAIR04-900 is a high voltage all-primary-sensing switching regulator produced by STMicroelectronics. This device operates directly from the rectified mains with a minimum of external components. It combines a high-performance low voltage PWM controller chip and a 900 V avalanche-rugged power section in the same package, making it highly efficient and reliable for various power management applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Transistor Breakdown Voltage (V) | 900 | V |
| Drain Current (A) | 0.7 | A |
| RDS(on) (Ω) | 16 | Ω |
| Maximum Switching Frequency | 166 | kHz |
| Operating Temperature Range | -40 to 125 | °C |
| Package Type | SO-16 | |
| Vcc Supply Voltage Range | 11.5 to 23 | V |
| Vcc Turn-on Threshold | 2.46 to 2.58 | V |
Key Features
- Optoless primary side constant voltage operations
- Adjustable and mains-independent maximum output current for safe operations during overload/short-circuit conditions
- 900 V avalanche-rugged internal power section
- Quasi-resonant valley switching operation
- Low standby consumption
- Overcurrent protection against transformer saturation and secondary diode short-circuit
- Burst-mode operation for very light loads to minimize frequency-related losses
- Hiccup-mode operation for short-circuit protection
Applications
- Switch-Mode Power Supplies (SMPS) for energy metering
- Auxiliary power supplies for 3-phase input industrial systems
- AC-DC adapters
Q & A
- What is the ALTAIR04-900?
The ALTAIR04-900 is a high voltage all-primary-sensing switching regulator produced by STMicroelectronics.
- What are the key features of the ALTAIR04-900?
Key features include optoless primary side constant voltage operations, adjustable and mains-independent maximum output current, 900 V avalanche-rugged internal power section, quasi-resonant valley switching operation, and low standby consumption.
- What is the maximum switching frequency of the ALTAIR04-900?
The maximum switching frequency is top-limited at 166 kHz.
- What are the operating temperature ranges for the ALTAIR04-900?
The operating temperature range is from -40°C to 125°C.
- What type of package does the ALTAIR04-900 come in?
The ALTAIR04-900 comes in an SO-16 package.
- How does the ALTAIR04-900 handle overcurrent protection?
The device includes overcurrent protection against transformer saturation and secondary diode short-circuit, and it operates in hiccup-mode during short-circuit conditions.
- What are some common applications of the ALTAIR04-900?
Common applications include SMPS for energy metering, auxiliary power supplies for 3-phase input industrial systems, and AC-DC adapters.
- How does the ALTAIR04-900 manage low load conditions?
The device enters a controlled burst-mode operation at very light loads to minimize frequency-related losses and comply with energy-saving regulations.
- What is the purpose of the high voltage start-up generator in the ALTAIR04-900?
The high voltage start-up generator is used to charge the Vcc capacitor and sustain the operation of the device, especially during CC regulation when the flyback voltage may not be sufficient.
- How does the ALTAIR04-900 ensure safe operation during fault events?
The device includes features such as adjustable maximum output current, overcurrent protection, and hiccup-mode operation to ensure safe and reliable operation during fault events.
