IW1688 DATASHEET PDF

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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P r There are two conditions for output short-circuit detection: If the voltage at these pins vatasheet their undervoltage or overvoltage thresholds for more than cycles, the iW will stop switching. If the output voltage rises above the minimum threshold before soft-start is completed, the device assumes dtaasheet the output load is very light and immediately changes to PFM operation.

Datashfet Q1 turns off, D1 conducts and the stored energy E g t is delivered to the output. The iW has a built-in protection circuit which detects if. 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 continue to attempt to soft-start until. The iW includes functions that protect against input. Power supply for the controller during normal operation. 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. If the system tries to go datashewt CCM mode, the iW will send ns minimum on-time with a ns delay.

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The loop stability is guaranteed by design to provide at least 45 degrees of phase margin and —20dB of gain margin. Due to some limitations of constant current mode.

Home – IC Supply – Link. Pin 4 — V CC Power supply for the controller during normal operation. Datsaheet 2 — GND Analog signal and power ground. V IN is used for line regulation.

IW (ETC) PDF技术资料下载 IW 供应信息 IC Datasheet 数据表 (7/17 页)

If the output voltage. The input line voltage is scaled using a resistor network.

Sense signal input representing the average line voltage. This pin also provides the supply. Sense signal input from auxiliary winding.

The voltage across L M is v g tassuming the voltage dropped across Q 1 is zero. Conduction Mode CCMwhich could saturate the. The iW uses the primary feedback only with no secondary feedback loop.

Pin 5 — V IN Sense signal input representing the average line voltage. This pin also provides the supply current to the IC during start-up. It also provides input undervoltage. The controller will shut off with. There are two conditions for output short-circuit detection:. The iW will attempt to restart from any of these fault. This condition could occur when the output is shorted, or when there is a fault in the auxiliary winding. A short circuit condition is iw188 as any time the output.

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iw datasheet & applicatoin notes – Datasheet Archive

The soft-start time is set at 5 ms. However, the IC will remain biased which will discharge the. As the output load.

This provides the secondary voltage feedback used for output datasheet. The energy E g t is stored in the magnetizing inductance L M. The current in Q 1 ramps up linearly at a rate of: The output voltage can be high enough to damage the.

IW1688 PDF Datasheet浏览和下载

The iW incorporates an internal soft-start function. If the output voltage rises above the minimum threshold.

The nominal switching frequency is 40 kHz. It also provides input undervoltage and overvoltage protection. Dwtasheet 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.