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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If the output voltage rises above the minimum threshold. This provides the secondary voltage feedback used for output regulation. The energy E g t is stored in the magnetizing inductance L M.
IW Datasheet, PDF – Alldatasheet
Thereafter, the on-time will be modulated by the line voltage and the off-time is modulated by the load current. This pin also provides the supply. The rectifying diode Datasheey is reverse biased and the load current I O is supplied by the secondary capacitor C O. Sense signal input representing the average line voltage. The loop stability is guaranteed by design to provide at least 45 degrees of phase margin and —20dB of gain margin. Home – IC Supply – Link. The iW will attempt to restart from any of these fault.
The output voltage can be high enough to damage the output capacitor when the feedback loop is broken. When Q1 turns off, D1 conducts and the stored energy E g t is delivered to the output.
The soft-start time is set at 5 ms. Pin 2 — GND Analog signal and power ground. The current iw688 Q 1 ramps up linearly at a rate of: 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 nominal switching frequency is 40 lw1688. The controller will continue to attempt to soft-start until. However, the IC will remain biased which will discharge the. This pin also provides the supply current to the IC during start-up.
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. The iW includes functions that protect against input. The iW has been designed to work in constant-current.
IW (ETC) PDF技术资料下载 IW 供应信息 IC Datasheet 数据表 (7/17 页)
It also provides input undervoltage. There are two conditions for output short-circuit detection:. The controller will shut off with 6 consecutive pulses after start-up. The controller will shut off with.
Pin 4 — V CC Power supply for the controller during normal operation. P r There are two conditions for output short-circuit detection: The controller will continue to attempt to soft-start until the error condition is removed.
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If no voltage is detected on V SENSE after 20 output pulses during start-up, it is assumed that the auxiliary winding of the transformer is either open or shorted, and the iW shuts down. Sense signal input from auxiliary winding. Home – IC Supply – Link. If the voltage at these pins exceed their undervoltage or overvoltage thresholds for more than cycles, the iW will stop switching. V IN is used for line regulation. CCM protection there are some trade-offs between size.
A short circuit condition is interpreted as any time the output. The iW has a built-in protection circuit which detects if the combination of the on-time and reset time exceed 25ms the total period of the typical 40kHz operating frequency. Due to some limitations of constant current mode. This condition could occur when the output is shorted, or when there is a fault in the auxiliary winding. It also provides input undervoltage and overvoltage protection.
Power supply for the controller during normal operation. The input line voltage is scaled iw168 a resistor network. As the output load. In order to regulate the output voltage within a dataseet. Conduction Mode CCMwhich could saturate the.