Using the company's integrated EcoSmart technology, TinySwitch-II enables a power supply design with high standby efficiency and low no-load power consumption of under 250 mW at 265 VAC input without a bias winding
on the transformer.
FSL206MRx Series Eliminates Auxiliary Bias Winding, Simplifies Design
The highly integrated PWM controller with avalanche-rugged SenseFET includes an internal regulator, eliminating the need for an auxiliary bias winding and includes a built-in high-voltage startup and full-protection circuitry that saves board space and total bill of material (BOM) costs.
Optimized for Bias Winding Feedback, the LinkSwitch(R) LNK520 Also Reduces EMI
The LNK520, a high-voltage monolithic power conversion IC, has been optimized for constant voltage, constant current (CV/CC) operation using primary side bias winding feedback.
TinySwitch-III also enables easy compliance with the most stringent standards for standby and no-load energy use, consuming less than 150 mW of no-load power without the use of a bias winding on the transformer.
New in TinySwitch-III Feature Benefit Selectable current Increased design flexibility -- three current limit limits available for each IC, allowing trade-offs between power output and efficiency/thermal rise Extended power Addresses universal-input power supplies with up to range 28 W of output, compared to 15 W for TinySwitch-II Even lower no-load Less than 150 mW at 265 VAC input without use of a consumption bias winding; Less than 50 mW achievable with bias winding On-time extension Typically reduces size of bulk capacitor required for low-line power delivery/hold-up time
The use of a transformer with a bias winding
further reduces no-load consumption to less than 50 mW.
By eliminating the separate bias winding
on the power supply transformer, system component cost is reduced compared to competitive switcher designs.
Once the circuit is started, the Vcc power for the IRIS4009 comes from the bias winding
of the main transformer.