Power management

Discuss power management solutions. Ask questions and find answers on voltage configurations, short circuit protection, and programming.

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stpd01 self destructs at 15V

I am using a STPD01 in a design for USB PD. Neat little part but I'm finding during testing that setting 15V output on this part immediately causes it's internal switching FET that most be located near the PVIN/VCC pins of the package to self destruc...

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Resolved! Identify this two terminal component

I'm trying to identify this two terminal components. It has these identifiers on it "CBJ GP 950", but there is a chance the GP is a 6P, but G looks correct. There are not cathode markings so I'm guessing it's not a diode, unless it's bidiretctional. ...

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jfalbo by Associate
  • 385 Views
  • 2 replies
  • 1 kudos

Resolved! L7987 ripple issue

HI Sir,we have two different results of the ripple noisebase on same PCBA design, but different L7987 origin:1. Mark of "ST e3 G9207,L7987, CHN 3L0",ripple noise 2.2V 2.9KHzinput 24V, output 12V, load 5ohm 2.4A 2. Mark of "ST e3 7B658, L7987, PHL 037...

L7987 CHN 12V 2.4A.jpg L7987 PHL 12V 2.4A.jpg L7987 CHN.png L7987 PHL.png
PZha.1 by Associate III
  • 2065 Views
  • 6 replies
  • 1 kudos

Resolved! Nmos transistor problem

Good morning; I want to do a simple relay controlled by my nucleo board; so I did a simple circuit with the STP55NF06L; however, it does not work as expeted, in real ife, even when I am not sending voltage to the gate, the transistor conducts electri...

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Jad by Senior
  • 345 Views
  • 1 replies
  • 0 kudos

STUSB4710 on a 3 port USB hub

Hello,I want to use 3x mentioned devices in a usb hub to deliver pover to peripherals.Does anyone has experience with something like this? Can it negotiate with three different devices or it will cuse some trouble.? Best regards, Mrdjoni  

miroslav by Associate III
  • 167 Views
  • 0 replies
  • 0 kudos

Viper35 waking up issue.

Hello,For the past few days, I’ve been trying to operate the VIPer35 quasi-resonant  offline high-voltage converter, but I haven't been able to get any output. I attempted to bypass or disconnect the output of the PC817 optocoupler and also tried sho...

ST1PS02D1QTR VOUT2 Output Discharge

I have ST1PS02D1QTR (output discharge disabled variant). However, I am observing that if AUX = low but external 1.2V is applied to VOUT2, I get power dissipation that seems in-line with output discharge resistance on VOUT2. My question is this: does ...

jmjec by Associate
  • 147 Views
  • 0 replies
  • 0 kudos

L4931 Output Capacitor

A design I am debugging is utilizing Y5V dielectric capacitors on the input and output of the L4931. There is a 2.2uF capacitor directly at the output and another 2.2uF capacitor on the other side of an ~4 Ohm resistor that analog supplies are used o...

ETarver by Associate
  • 267 Views
  • 1 replies
  • 0 kudos