PI Forums

We applied to an internationally and well known accredited laboratory for LVD certification of our LED driver designed with INN3162C. Although our product meets SELV specifications in terms of insulation, it is considered "no-insulation" by lab. The reason is given to be "inductive coupling" rather than "optical coupling". The article

Hi Im making 20W in CV (5V) The primary bypass cap charge to 5.16V and i think it is noraml voltage but the secondary bypass cap doesn't charge at 4.4V We use diode for SR FET so SR pin is connect to ic GND. I understand that the under registor

Hi, Kindly help me with the MTBF and FIT value for the below part no. Part#: INN3166C-H101-TL Manuel Chiumarulo

In the circuit, I did not see pin 6 of T8 connected to pin G or pin S of U5. Is this correct? Please refer to the attachment for the circuit。 I hope someone can help me answer. Thank you very much。

Dear Sirs, I would like to know if the TNY276GN is original or not. The lot number is 6K702M and date code 2215, COO Malaysia. I would be grateful if anyone helps me.

I have following question: For TOP265KG-TL is there any limit for negative startup current? We got some specification in that it is given that negative starting current limit for TOP265KG-TL is -200mA. Negative startup current means source to drain current. But in TOP265 datasheet & other application note, we have

I'm replacing a blown LNK304 in a washing machine. After replacing this component plus the 33ohm fusible resistor, I found that the output voltage is pulsing at aprox 500ms. Tested all the components in the power suply and all are ok. Mounted an external board with the same schematic as

I am using TOP268KG-TL for 4.5 W output. At 19.2V DC converter operating in CCM, But from from 40V above it is operating in DCM. Input: 19.2 - 373V DC & Universal AC input output: 12V, 5W Transformer: Primary 24; Secondary 16; Auxillary 17 ( output voltage 15); Primary magnatizing

Hi Im making 20W adaptor using INN3279C-H114 The topology is Quasi-resonant flyback and input is 220rms and out put is 5V 4A CV The R2CD snubber spec R=270K C=1000p Line R with diode=33 but when we simulate the product the IC get hotter and E-load voltage is getting up but

I designed a circuit using TNY178D and during the testing process, I found that the current limiting value for different loads is 100mA. If the load is heavy, it will enter an automatic restart state. However, its current value still turns off the MOSFET at 100mA, which is significantly different

Hello, We are experiencing an issue with the status outputs (SO) of the 2SC0435T when the driver is damaged. Specifically, faults are not being reported, and the SO is always in a high impedance state, even though the fault criteria (secondary side under voltage or overcurrent) are met. By "damaged,"

Mr. / Ms. PI engineer, currently our company is going to use inn3949cq chip to build a power output, if I want to meet the 300V-1000V input, 12V/15W output, can you tell me the relevant parameters of the transformer to meet this demand? For example, the number of primary and

Hello, I have another feature request for PI Expert. Since the company I work for only uses pre-gapped cores, it would be very useful if I could enter the desired core gap, and the remaining values were calculated with that in mind, instead of the core gap being calculated based

Our team is designing SMPS Input DC : 19.2 - 373 Volt & universal AC voltage range output : 12V , 5W We have previous design of 3W output, Which is working fine in above input range (primary inductance 240uH). This design we are modifying for 12V, 5W. Here V

How to interpret magnetic designer result regarding the core needed? There are instruction to put together E core plus Plate, but according to stack high two E cores should be used. At the same time, there is reference about nominal inductance and gap size, but there is no solution how

Hello, in the PI University Course Notes "Bringing Up a Flyback Supply for the First Time" there is a link to a PI University course named "Fixing a Flyback Supply that Does Not Deliver Full Power". The link doesn' t work any more. Is there a course note for this

Using top265 Input 19.2 to 373DC has been designed now I am trying it to extend for 5W. for higher voltage it is working fine. but at 19.2V it is not turning on and with some changes even it got tuned on then after some time input current start increasing

Hi Team, I want to know in SMPS design when feedback voltage from the output side increase beyond a certain limit then smps goes off due output overvoltage but at this condition when smps output off then feedback voltage is also zero then switching IC will sense zero feedback voltage

I designed a SW power supply using LNK6774. I want to design protection for SW power supply by Overvoltage protection function I would like to know about "External shutdown and reset options" by change resistor to comparator circuit connect base of transistor, can I do that? and can you please

Hi I'm looking some family note of INN327x series There are some technique reduce out put ripple This picture put Cap between Gnd and Vout In my opinion this cap reduce signal noise for Vout pin, so it can help reduce output voltage ripple This cap is relative for Foward