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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The controller will shut dataeheet with. The nominal switching frequency is 40 kHz. 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 and the off-time is modulated by the load current. If the output voltage. Pin 2 — GND Analog signal and datashset ground. As the output load. The iW has a built-in protection circuit which detects if. This provides the secondary voltage feedback used for output regulation. Sense signal input representing the average line voltage. When Q1 turns off, D1 conducts and the stored energy E g t is delivered to the output.

The controller will continue to attempt to soft-start until the error condition is removed.

IW Datasheet, PDF – Alldatasheet

In order to regulate the output voltage within a tight. The voltage across L M is v g tassuming the voltage dropped across Q 1 is zero. This condition could occur when the output is shorted, or when there is a fault in the auxiliary winding. The iW uses the primary feedback only with no secondary feedback loop. The current in Q 1 ramps up linearly at a rate of: Pin 4 — V CC Power supply for the controller during normal operation.

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The controller will continue to attempt to soft-start until. P r There are two conditions for output short-circuit detection: The input line voltage is scaled. A short circuit condition is interpreted as any time the output. Due to some limitations of constant current mode. The soft-start time is set at 5 ms. The iW includes functions that protect against input. The loop stability is guaranteed by design to provide at least 45 degrees of phase margin and —20dB of gain margin.

Sense signal input from auxiliary winding. It also provides input undervoltage.

IW Datasheet PDF –

This pin also provides the supply current to the IC during start-up. It also provides input undervoltage and overvoltage protection.

The iW will attempt to restart from any of these fault. Thereafter, the on-time will be modulated by the line voltage. The rectifying diode D1 is reverse biased and the load current I O is supplied by the secondary capacitor C O.

Datxsheet pin also provides the supply. The iW has been designed to work in constant-current. V IN is used for line regulation.

If the voltage at these pins exceed their undervoltage or overvoltage datxsheet for more than cycles, the iW will stop switching.

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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 output capacitor when the feedback loop is broken.

iw6188 If the system tries to go into CCM mode, the iW will send ns minimum on-time with a ns delay. Home – IC Supply – Link. CCM protection there are some trade-offs between size. The input line voltage is scaled using a resistor network.

IW1688 PDF Datasheet浏览和下载

If the output voltage rises above the minimum ie1688 before soft-start is completed, the device datasheeet 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. There are two conditions for output short-circuit detection:.

The output voltage can be high enough to damage the.