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Designed for isolated and non-isolated fly-back topologies and called LinkSwitch-XT2, the family can achieve current and voltage regulation of better than -/+3% and typical efficiency above 80%.
LinkSwitch-XT2 ICs consume less than 10 mW in no-load conditions when used with a bias winding (100mW without).
High (132kHz) operating frequency allows small power transformers to be used, which can be further shrunk using the programmable current limit.
The chips combine a 725V mosfet with control circuitry on a single silicon die.
“Integrated safety and reliability features include input over-voltage protection, hysteretic thermal shutdown for over-temperature protection, and auto-restart for output short-circuit, over-voltage and open-loop protection,” said the firm, which sees them being used in small appliances such as microwave ovens, IoT, utility meters, industrial applications and smart-home installations.
Package options are:
- P – DIP-8C
- D – SO-8C
- G – SMD-8C
The data sheet has plenty of application information – it looks like isolated designs need an opto-coupler – and there is a reference design (DER-578) for a 5V 500mA power supply.
| LNK3604 output power at 50°C ambient |
230Vac ±15% | 85-265Vac | ||
| adaptor | open frame | adaptor | open frame | |
| reduced current limit (Cbypass = 1.0μF) |
4.9W | 7.3 | 3.6 | 4.6 |
| standard current limit (Cbypass = 0.1μF) |
5.6 | 9.2 | 4.1 | 6.1 |
adaptor: max continuous power in typical non-ventilated enclosed adapter.
open frame: max practical continuous power in an open frame design with adequate
heat sinking.
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