The STWK01 device is intended to operate at a converter secondary side as the wake-up controller during burst mode operation, in applications using the STCH01, a primary side advanced multi-mode power management IC (flyback-like converters).
For the correct operation of the circuit, the secondary side of the converter has to be configured connecting the rectifier diode with an anode to GND and a cathode to the proper secondary winding pin, while the output capacitor is connected to the other pin of the secondary winding. The internal N-channel MOSFET (the source connected to GND and the drain to the OUT pin) has to be placed in parallel to the flyback converter output diode.
When at a light load or no-load the main device STCH01 enters burst mode operation and stops switching, the wake-up controller senses at the secondary side that there is no switching activity and remains waiting that the output voltage discharges down to the threshold set by an external resistive divider connected to the sensing pin Vsns: when the internal threshold is reached, the wake-up controller switches on the internal MOSFET for a short time interval: this allows to generate a wake-up pulse across the transformer secondary winding that, by a transformer coupling, is transferred at the primary side across the auxiliary winding connected to the primary side controller STCH01. The transferred wake-up pulse is detected by the ZCD pin of the main IC that resumes the operation.
The device generates a wake-up pulse also in case, during burst mode operation, it detects an overvoltage condition on the output.
Key Features
| Description | Version | Size |
|---|---|---|
| DS10527: Secondary side wake-up controller | 1.0 | 249 KB |
| Description | Version | Size |
|---|---|---|
| TA0308: Reducing the total no-load power consumption of battery chargers and adapter applications | 1.3 | 100 KB |
| Description | Version | Size |
|---|---|---|
| Brochure Power management guide | 05.2016 | 4 MB |
| Part Number | Package | Packing Type | Operating Temperature (°C) (min) | Operating Temperature (°C) (max) | Reference Voltage (V) (nom) | Unit Price (US$) * | Quantity | ECCN (EU) | ECCN (US) | Country of Origin |
|---|---|---|---|---|---|---|---|---|---|---|
| STWK01TR | SOT23-6L | Tape And Reel | - | - | - | - | - | NEC | EAR99 | - |
| Part Number | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|
| STWK01TR | SOT23-6L | Industrial | Ecopack2 |
