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TEA1507 is a green energy saving power chip from Philips Semiconductor, which is in an 8-pin package.
Each pin function
Pin 1: Power supply and undervoltage protection input
Pin 2: Ground
Pin 3: Switch tube pulse width control
Pin 4: Demagnetizing control input, overvoltage overload protection input
Pin 5: Switch tube current detection input
Pin 6: Switch tube drives pulse output
Pin 7: Empty pin
Pin 8: Start voltage input, valley value detection input
TEA1507 1. Power supply 2. Ground 3. Control input 4. Demagnetizing\/overvoltage\/overload protection 5. Current detection input 6. Switch tube grid 7. High voltage isolation area (empty pin) 8. Switch tube drain 3842 1. Error signal compensation 2. Feedback input 3. Switch tube current detection 4. External timing element 5. Ground 6. Switch grid 7. Power supply 8.5V reference voltage