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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Home – IC Supply – Link. P r There are two conditions for output datasheet detection: When Q1 turns off, D1 conducts and the stored energy E g t is delivered to the output.
Pin 2 — GND Analog signal and power ground. The iW uses the primary feedback only with no secondary feedback loop. The output voltage can be high enough to damage the output capacitor when the feedback loop iw6188 broken. Sense signal input from auxiliary winding. The iW has been designed to work in constant-current.
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Pin 4 — V CC Power supply for the controller during normal operation. CCM protection there are some trade-offs between size. Home – IC Supply – Link.
The soft-start time is set at 5 ms. A short circuit condition is interpreted as any time the output. The input line voltage is scaled.
iw datasheet & applicatoin notes – Datasheet Archive
The controller will shut datashedt with. The current in Q 1 ramps up linearly at a rate of: The iW includes functions that protect against input. This provides the secondary voltage feedback used for output regulation. The voltage across L M is v g tassuming the voltage dropped across Q 1 is zero. The controller will continue to attempt to soft-start until the error condition is removed. This condition could occur when the output is shorted, or when there is a fault in the auxiliary winding.
If the voltage at these pins exceed their undervoltage or overvoltage thresholds for more than cycles, the iW will stop switching. Thereafter, the on-time will be modulated by the line voltage and the off-time is modulated by the load current. If no voltage is detected on V Id1688 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.
However, the IC will remain biased which will discharge the. The energy E g t is stored in the magnetizing inductance L M.
The output voltage can be high enough to damage the. The controller will continue to attempt to soft-start until.
There are two conditions for output short-circuit detection:. 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 loop stability is guaranteed by design to provide at least 45 degrees of phase margin and —20dB of gain margin. Conduction Mode CCMwhich could saturate the.
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If the output voltage. The iW incorporates an internal soft-start function. The nominal switching frequency is 40 kHz.