TEA1733T SMPS Controller IC
The TEA1733T is an NXP Semiconductors GreenChip fixed-frequency flyback SMPS controller IC designed for efficient and cost-effective AC-DC power supply applications. It is suitable for power supplies up to approximately 75 W and integrates features such as overcurrent protection, overpower protection, frequency jitter for reduced EMI, slope compensation for CCM operation, soft-start control, and multiple protection inputs.
For Bangladeshi electronics students, engineers, technicians and power-supply repair professionals, the TEA1733T is particularly useful when designing or repairing flyback SMPS circuits, AC-DC adapters, notebook power supplies, chargers and other compact power supplies.
The TEA1733T SMPS Controller IC is an 8-pin SO8 controller intended for fixed-frequency flyback converters. Its integrated controller functions help reduce external component count while providing current regulation and protection functions.
The IC supports a 12 V to 30 V operating supply range and uses a gate-driver output to control an external power MOSFET. At light loads, the controller reduces switching frequency to help reduce switching losses and improve efficiency.
NXP also documented a 65 W, 19.5 V notebook adapter reference design using the TEA1733T, demonstrating its use in practical AC-DC flyback power supplies.
Features:
- NXP GreenChip SMPS controller
- Fixed-frequency flyback controller
- Suitable for applications up to approximately 75 W
- 12 V to 30 V controller supply range
- SO8, 8-pin package
- Integrated gate-driver output
- Frequency jitter for reduced EMI
- Frequency reduction at low output power
- Slope compensation for CCM operation
- Adjustable OverCurrent Protection (OCP)
- OverPower Protection (OPP)
- Adjustable overpower timeout
- Adjustable overpower restart timer
- Soft-start functionality
- Input under-voltage and over-voltage protection can be implemented
- Output over-voltage and over-temperature protection can be implemented
- Low startup/restart supply current
- Low no-load operating current
Specifications:
| Specification | TEA1733T |
|---|---|
| Manufacturer | NXP Semiconductors |
| Product family | GreenChip |
| Function | SMPS Controller IC |
| Topology | Flyback |
| Control method | Fixed frequency |
| Supply voltage range | 12 V to 30 V |
| Typical startup/restart current | 10 µA |
| Typical no-load operating current | 0.5 mA |
| Maximum recommended application power | Up to approximately 75 W |
| Package | SO8 / SOT96-1 |
| Number of pins | 8 |
| Gate drive | External MOSFET |
| Current protection | OCP |
| Power protection | OPP |
| EMI reduction | Frequency jitter |
| CCM support | Integrated slope compensation |
| Soft start | Yes |
| Protection inputs | VINSENSE and PROTECT |
Specifications are based on the NXP TEA1733T datasheet.
TEA1733T Pin Configuration
The TEA1733T uses an 8-pin SO8 package.
| Pin | Name | Function |
|---|---|---|
| 1 | VCC | IC supply voltage |
| 2 | GND | Ground |
| 3 | DRIVER | External MOSFET gate-driver output |
| 4 | ISENSE | Current-sense input |
| 5 | VINSENSE | Input-voltage protection sensing |
| 6 | PROTECT | General protection input |
| 7 | CTRL | Control input |
| 8 | OPTIMER | Overpower and restart timer |
Applications:
The TEA1733T can be used in:
- AC-DC SMPS power supplies
- Flyback power supplies
- Notebook adapters
- Laptop chargers
- Consumer electronics power supplies
- Embedded power supplies
- Compact offline power supplies
- Low-cost auxiliary power supplies
- Electronics repair and replacement applications
- Student SMPS design projects
- Power electronics laboratory projects
NXP's reference design demonstrates a 65 W, 19.5 V AC-DC notebook adapter based on the TEA1733T
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