IWST-TR from iWatt, Inc.. Find the PDF Datasheet, Specifications and Distributor Information. IW Datasheet, IW PDF, Low Power Off Line Digital PWM Controller. IW datasheet,Page:6, iW Low-Power Off-line Digital PWM Controller Pin Detail Pin 1 – VSENSE Sense signal input from auxiliary winding.
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Sense signal input from auxiliary winding. Power supply for the controller during normal operation. Sense signal input representing the average line voltage.
The input line voltage is scaled. It also provides input undervoltage. This pin also provides the supply.
The dataheet will attempt to restart from any of these fault. The iW incorporates an internal soft-start function. The nominal switching frequency is 40 kHz.
IW Datasheet PDF –
If the output voltage rises above the minimum threshold. In order to regulate the output voltage within a tight. This provides the secondary voltage feedback used for output regulation.
Pin dagasheet — GND Analog signal and power ground. Pin 4 — V CC Power supply for the controller during normal operation. Pin 5 — V IN Sense signal input representing the average line voltage.
V IN is used for line regulation. The input line voltage is scaled using a resistor network.
It also provides input undervoltage and overvoltage protection. This pin also provides the supply current to the IC during start-up. The soft-start time is set at 5 ms. Once the V IN pin voltage has reached its turn-on threshold, the iW starts switching, but limits the on-time to a percentage of the maximum on- time.
The energy E g t is stored in the magnetizing inductance Datadheet M. The rectifying diode D1 is reverse biased and the load current I O is supplied by the secondary capacitor C O. When Q1 turns off, D1 conducts and the stored energy E g t is delivered to the output. If the output voltage rises above the minimum threshold before soft-start is completed, the device assumes that the output load is very light and immediately changes to PFM operation.
If no voltage is detected on V SENSE after 20 output pulses datashee start-up, it is assumed that the auxiliary winding of the transformer is either open or shorted, and the iW shuts down. The voltage across L M is v g tassuming the voltage dropped across Q 1 is zero.
The current in Q 1 ramps up linearly at a rate of: Home – IC Supply – Link.