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 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.

IW1688 Datasheet PDF

A short circuit condition is interpreted as any time the output. Home – IC Supply – Link. However, the IC will remain biased which will discharge the. If the output voltage. The input line voltage is scaled. The iW has been designed to work in constant-current.


IW1688 PDF Datasheet浏览和下载

Once the V IN pin voltage datasheeg reached its turn-on threshold, the iW starts switching, but limits the on-time to a percentage of the maximum on- time. Thereafter, the on-time will be modulated by the line voltage. Home – IC Supply – Link. The energy E g t is stored in the magnetizing inductance L M.

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

Thereafter, the on-time will be modulated by the line voltage and the off-time datasehet modulated by the load current. The iW incorporates an internal soft-start function.

The rectifying diode D1 is reverse biased and the load current I O is supplied by the secondary capacitor C O. Power supply for the controller during normal operation.

The iW includes functions that protect against input. Sense signal input representing the datasheeet line voltage. The nominal switching frequency is 40 kHz. It also provides input undervoltage and overvoltage protection.

The voltage across L M is v g tassuming the voltage dropped across Q 1 is zero. If the system tries to go into CCM mode, the iW will send ns minimum on-time with a ns delay. Due to some limitations of constant current mode.


If the output voltage rises above the minimum threshold. It also provides input undervoltage. The controller will continue to attempt to soft-start until the error condition datasueet removed.

The input line voltage is scaled using a resistor network. Pin 5 — V IN Sense signal input representing the average line voltage. In order datashwet regulate the output voltage within a tight.

The output voltage can be high enough to damage the. V IN is used for line regulation. CCM protection there are some trade-offs between size. Pin 2 — GND Analog signal and i1w688 ground. The iW has a built-in protection circuit which detects if.

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