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GreenChip SMPS Control IC
The TEA18362 is a controller IC for low-cost Switched Mode Power Supplies (SMPS). It is intended for flyback topologies. The built-in green functions provide high efficiency at all power levels.
At high power levels, the flyback operates in Quasi-Resonant (QR) mode. At lower power levels, the controller switches to Frequency Reduction (FR) or Discontinuous Conduction Mode (DCM) and limits the peak current to approximately 25 % of the maximum peak current. Valley switching is used in all operating modes.
At low power levels, when the flyback switching frequency drops below 25 kHz, the flyback converter switches to burst mode. A special burst mode has been integrated which reduces the opto current to a minimum level, ensuring high efficiency at low power and excellent no-load power performance. As the switching frequency in this mode has a minimum value of 25 kHz while the burst frequency is below 800 Hz, the frequencies are outside the audible range. During the non-switching phase of the burst mode, the internal IC supply current is minimized for further efficiency optimization.
The TEA18362 includes an accurate OverPower Protection (OPP). The OPP enables the controller to operate in overpower situations for a limited amount of time. If the output is shorted, the system switches to the low-power mode where the output power is limited to a lower level.
The TEA18362 is manufactured in a high-voltage Silicon-On-Insulator (SOI) process.
The SOI process combines the advantages of a low-voltage process (accuracy, high-speed protection, functions, and control) while maintaining the high-voltage capabilities (high-voltage start-up, low standby power, and an integrated X-capacitor discharge function).
The TEA18362 enables low-cost, highly efficient and reliable supplies for power requirements up to 75 W to be designed with a minimum number of external components.
製品詳細
Features
General features
- SMPS controller IC for low-cost applications
- Large supply voltage range (up to 30 V)
- Integrated high-voltage start-up
- Continuous VCC regulation during start-up and protection via the HV pin, allowing a minimum VCC capacitor value
- Reduced opto current in burst mode enabling low no-load power consumption
- Operating frequencies in all operating modes are outside the audible area
- Integrated X-capacitor discharge; NXP Semiconductors patented (Patent reference: 81512184EP01 (Patent pending))
- Adjustable soft start
- Power-down mode via the PROTECT pin1
Green features
- Low supply current during normal operation (0.6 mA without load)
- Low supply current during the non-switching state in burst mode (0.2 mA)
- Valley switching for minimum switching losses
- Frequency reduction with fixed minimum peak current to maintain high efficiency at low output power levels
Protection features
- Mains voltage independent OverPower Protection (OPP)
- OverTemperature Protection (OTP)
- Integrated overpower time-out
- Integrated restart timer for system fault conditions
- Continuous mode protection using demagnetization detection
- Accurate OverVoltage Protection (OVP)
- General-purpose input for latched protection; for use with system OverTemperature Protection (OTP)
- Driver maximum on-time protection
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ドキュメント
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