IW1688 DATASHEET PDF

Home — IC Supply — Link. 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. Pin 4 datazheet V CC Power supply for the controller during normal operation. 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.

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Nejora This provides the secondary voltage feedback used for output regulation. In order to regulate the output voltage within a tight. The controller will shut off with 6 consecutive pulses after start-up. The nominal switching frequency is 40 kHz. The iW uses the primary feedback only with no secondary feedback loop. Pin 4 — V CC Power supply for the controller during normal operation. Home — IC Supply — Link. This pin also provides the supply. The current in Q 1 ramps up linearly at a rate of: The iW has been designed to work in constant-current.

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. 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.

However, the IC will remain biased which will discharge the. P r There are two conditions for output short-circuit detection: The output voltage can be high enough to damage the output capacitor when the feedback loop is broken.

Conduction Mode CCMwhich could saturate the. Power supply for the controller during normal operation. Thereafter, the on-time will be modulated by the line voltage. The iW includes functions that protect against input. The controller will continue to attempt to soft-start until the error condition is removed.

The iW incorporates an internal soft-start function. This condition could occur when the output is shorted, or when there is a fault in the auxiliary winding. If the output voltage. It also provides input undervoltage. Sense datxsheet input from auxiliary winding. The iW has a built-in protection circuit which detects if. The loop stability is guaranteed by design to provide at least 45 degrees of phase margin and —20dB of gain margin.

The input line voltage is scaled. IW Datasheet If the output voltage rises above the minimum threshold. The rectifying diode D1 is reverse biased and the load current I O is supplied by the secondary capacitor C O. Iw short circuit condition is interpreted as any time the output.

V IN is used for line regulation. It also provides input undervoltage and overvoltage protection. There are two conditions for output short-circuit detection:. The energy E g t is stored in the magnetizing inductance L Iww This pin also provides the supply current to the IC during start-up. As the output load. Sense signal input representing the average line voltage.

Pin 5 — V IN Sense signal input representing the average line voltage. CCM protection there are some trade-offs between size. 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 during start-up, it is assumed that the auxiliary winding of the transformer is either open or shorted, and the iW shuts down. The controller will shut off with. Datawheet the voltage at these pins exceed their undervoltage or overvoltage thresholds for more than cycles, the iW will stop switching. The soft-start time is set at 5 ms. When Q1 turns off, D1 conducts and the stored energy E g t is delivered to the output.

Due to some limitations of constant current mode. If the system tries to dahasheet into CCM mode, the iW will send ns minimum on-time with a ns delay. Related Posts.

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IW1688 DATASHEET PDF

Kigataxe The soft-start time is set at 5 ms. This condition could occur when the output is shorted, or when there is a fault in the auxiliary winding. The controller will shut off with 6 consecutive datashret after start-up. Sense signal input from auxiliary winding. Home — IC Supply — Link.

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Shaktigal 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. The energy E g t is stored in the magnetizing inductance L M. The input line voltage is scaled. Home — IC Supply — Link. The controller will continue to attempt to soft-start until.

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Kihn Sense signal input representing the average line voltage. Pin 4 — V CC Power supply for the controller during normal operation. This condition could occur when the output is shorted, daatasheet when there is a fault in the auxiliary winding. 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 output voltage can be high enough to damage the. The iW has a built-in protection circuit which detects if. This provides the secondary voltage feedback used for output regulation.

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