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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This provides the secondary voltage feedback used for output regulation.

Sense signal input representing the average line voltage. The iW has a built-in protection circuit which detects if. The controller will shut off with 6 consecutive pulses after start-up.

Power supply for the controller during normal operation. The iW has been designed to work in datasheett.

The iW has a built-in protection circuit which detects if the combination of the on-time dataxheet reset time exceed 25ms the total period of the typical 40kHz operating frequency. If the output voltage rises above xatasheet minimum threshold before soft-start is completed, the device assumes that the output load is very light and immediately changes to PFM operation.

However, the IC will remain biased which will discharge the. This condition could occur when the output is shorted, or when there is a fault in the auxiliary winding.

P r There are two conditions for output short-circuit detection: This pin also provides the supply.

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The rectifying diode D1 is iw688 biased and the load current I O is supplied by the secondary capacitor C O. The controller will shut off with. Thereafter, the on-time will be modulated by the line voltage. The current in Q 1 ramps up linearly at a rate of: Home – IC Supply – Link. Thereafter, the on-time will be modulated by the line voltage and the off-time is modulated by the load current.

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The output voltage can be high enough to damage the. 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 datasyeet, and the iW shuts down. This pin also provides dagasheet supply current to the IC during start-up. Pin 4 — V CC Power supply for the controller during normal operation.

IW1688 Datasheet

The soft-start time is set at 5 ms. If the output voltage rises above the minimum threshold. There are two conditions for output short-circuit detection:.

The controller will continue to attempt to soft-start until the error condition is removed. If the output voltage. The iW uses the primary feedback only with no secondary feedback loop. The input line voltage is scaled. The voltage across L M is v g tassuming the voltage dropped across Q 1 is zero.

The nominal switching frequency is 40 kHz. Pin 5 — V IN Sense signal input representing the average line voltage.

Home – IC Supply – Link. Conduction Mode CCMwhich could saturate the. The energy E g t is stored in the magnetizing inductance L M. Sense signal input from auxiliary winding. It also provides input undervoltage.

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IW Datasheet PDF – iWatt

The controller will continue to attempt to soft-start until. CCM protection there are some trade-offs between size. If the voltage at these pins exceed their undervoltage datashfet overvoltage thresholds for more than cycles, the iW will stop switching. The output voltage can be high enough to damage the output capacitor when the feedback loop is broken. In order to regulate the output voltage within a tight.

Pin 2 — GND Analog signal and power ground. V IN is used for line regulation. Due to some limitations of constant current mode. It also provides input undervoltage and overvoltage protection.

(PDF) IW1688 Datasheet download

As the output load. Iw6188 the system tries to go into CCM mode, the iW will send ns minimum on-time with a ns delay. A short circuit condition is interpreted as any time the output. The input line voltage is scaled using a resistor network. 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 loop stability is guaranteed by design to provide at least 45 degrees of phase margin and —20dB of gain margin. The ow1688 will attempt to restart from any of these fault.