TOP246YN belongs to TOPSwitch-GX Family from the manufacturer “Power Integrations”. It is with Extended Power, Design Flexiblity, EcoSmart & Integrated Off-line Switcher. TOPSwitch-GX uses the same proven topology as TOPSwitch, cost effectively integrating the high voltage power MOSFET, PWM control, fault protection and other control circuitry onto a single CMOS chip. Many new functions are integrated to reduce system cost and improve design flexibility, performance and energy efficiency. Depending on package type, either 1 or 3 additional pins over the TOPSwitch standard DRAIN, SOURCE and CONTROL terminals allow the following functions: line sensing (OV/UV, line feed-forward/DCMAX reduction), accurate externally set current limit, remote ON/OFF, synchronization to an external lower frequency, and frequency selection (132 kHz/66 kHz). All package types provide the following transparent features: Soft-start, 132 kHz switching frequency (automatically reduced at light load), frequency jittering for lower EMI, wider DCMAX, hysteretic thermal shutdown, and larger creepage packages. In addition, all critical parameters (i.e. current limit, frequency, PWM gain) have tighter temperature and absolute tolerances to simplify design and optimize system cost.

Features:

1. Lower System Cost, High Design Flexibility
2. Extended power range for higher power applications
3. No heatsink required up to 34 W using P/G packages
4. Features eliminate or reduce cost of external components
5. Fully integrated soft-start for minimum stress/overshoot
6. Externally programmable accurate current limit
7. Wider duty cycle for more power, smaller input capacitor
8. Separate line sense and current limit pins on Y/R/F packages
9. Line under-voltage (UV) detection: no turn off glitches
10. Line overvoltage (OV) shutdown extends line surge limit
11. Line feed-forward with maximum duty cycle (DCMAX) reduction rejects line ripple and limits DCMAX at high line
12. Frequency jittering reduces EMI and EMI filtering costs
13. Regulates to zero load without dummy loading
14. 132 kHz frequency reduces transformer/power supply size
15. Half frequency option in Y/R/F packages for video applications
16. Hysteretic thermal shutdown for automatic fault recovery
17. Large thermal hysteresis prevents PC board overheating
18. EcoSmart – Energy Efficient
19. Extremely low consumption in remote off mode (80 mW at 110 VAC, 160 mW at 230 VAC)
20. Frequency lowered with load for high standby efficiency
21. Allows shutdown/wake-up via LAN/input port