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nidhi singh
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nidhi singh
Asked: January 7, 2023In:
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Hello. I’ve been using the diodes as an RF sensor for 2.4 GHz signals. After many tests, the diodes keep breaking down and I had to change the diodes. Reverse Voltage (Vr) is below the maximum ratings for both of them. ...Read more

Hello.

I’ve been using the diodes as an RF sensor for 2.4 GHz signals. After many tests, the diodes keep breaking down and I had to change the diodes. Reverse Voltage (Vr) is below the maximum ratings for both of them. The circuit used for this is in the document” RF and microwave power discovery with
Schottky diodes” as attached.

Can you please help me understand why this is passing and any suggestions on how I can stop this from passing?

Thank you

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bat62bat63diodespowerrf sensor
  1. vikas Nagpal

    Hello， Have you checked that the bypass capacitor is chosen to be 1nF？ So that it has low ohmic capacitive reactance up to 6 GHz. RL between 10kohm and 1Mohm Best regards, Vikas

    Hello，

    Have you checked that the bypass capacitor is chosen to be 1nF？
    So that it has low ohmic capacitive reactance up to 6 GHz.
    RL between 10kohm and 1Mohm

    Best regards,

    Vikas

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vikas Nagpal
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vikas Nagpal
Asked: January 6, 2023In:
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Hii, I’ve built a sample board of a 2A colorless LED driver applying the LED2000 move-down converter with a single LiIon battery as the power source. Everything seems to be solved as it should, but I would like to try the ...Read more

Hii,

I’ve built a sample board of a 2A colorless LED driver applying the LED2000 move-down converter with a single LiIon battery as the power source.
Everything seems to be solved as it should, but I would like to try the circuit more thoroughly to ensure the design is robust.

Would anyone have pointers on how to test the circuit, what parameters to measure, and what warning signs to look for that may indicate that something isn’t performing optimally?

Thanks, Vikas

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batterycircuitledLED2000liionpower
  1. nidhi singh

    Hi, If you have a DC-coupled Current inquiry you can cover Inductor Current to check if it isn't working in the saturation region. Still, also you can check the switching pin with a voltage inquiry just to see a perfect waveform and measure the right switching frequency. Let me know. Nidhi Singh

    Hi,

    If you have a DC-coupled Current inquiry you can cover Inductor Current to check if it isn’t working in the saturation region. Still, also you can check the switching pin with a voltage inquiry just to see a perfect waveform and measure the right switching frequency.

    Let me know.

    Nidhi Singh

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ipaintmymind
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ipaintmymind
Asked: December 28, 2022In:
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Hii, Is there any difference between ST1CC40 and LED2000 regulators? I couldn’t tell any difference based on the datasheet info. Thank you in advance…  

Hii, Is there any difference between ST1CC40 and LED2000 regulators?

I couldn’t tell any difference based on the datasheet info.

Thank you in advance…

 

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LED2000powerRegulatorsST1CC40
  1. ashishgawade

    Hi, The only difference between the two devices is a pin. In LED2000 you find the DIM pin while in ST1CC40 you find the INH pin. The differences between the DIMMING function and INHIBIT is that whit DIM device is already turned ON (internal sense), and with INH device starts always from OFF--> ONRead more

    Hi,

    The only difference between the two devices is a pin. In LED2000 you find the DIM pin while in ST1CC40 you find the INH pin. The differences between the DIMMING function and INHIBIT is that whit DIM device is already turned ON (internal sense), and with INH device starts always from OFF–> ON.
    So for the dimming function better to use LED2000.

    Regards

    Ashish

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nidhi singh
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nidhi singh
Asked: December 24, 2022In:
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Hi, I’m presently using an STP16CPC26, and due to a supply shortage, we’d like to replace it. The STP16CPC05 seems a good fit, but I can not really find the differences with the PC26, except for the current output( 90mA ...Read more

Hi,
I’m presently using an STP16CPC26, and due to a supply shortage, we’d like to replace it.
The STP16CPC05 seems a good fit, but I can not really find the differences with the PC26, except for the current output( 90mA vs 100mA), could you help me?
Thanks

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powerstp16cpc05stp16cpc26supply
  1. Alex thomas

    Welcome, to the community! Yes, the newer STP16CPC05 can replace the older STP16CPC26 and contains some advancements that make component selection easier (smaller bypass capacitor possible) or the slightly advanced maximum driver current. Does it answer your question? Regards

    Welcome, to the community!

    Yes, the newer STP16CPC05 can replace the older STP16CPC26 and contains some advancements that make component selection easier (smaller bypass capacitor possible) or the slightly advanced maximum driver current.

    Does it answer your question?

    Regards

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Alex thomas
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Alex thomas
Asked: December 20, 2022In:
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Hello, I have a problem with the L6498D driver, the high- side doesn’t work designed a driver for a full h- bridge using two L6498D when I activate the LIN input the LVG output is activated and manages to turn ...Read more

Hello, I have a problem with the L6498D driver, the high- side doesn’t work designed a driver for a full h- bridge using two L6498D when I activate the LIN input the LVG output is activated and manages to turn on the low side MOSFET, but when I activate the HIN input I get a strange output of9.6 v on HVG and I’m using 12v at VCC of the L6498D. This strange voltage position always appears, when I always keep the HIN input high or when there’s a PWM in HIN, in both situations the HVG output is always the same,9.6 v.

What could be happening?

 

Thank You

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driverhigh-sidel6498dmanagementsmosfetpower
  1. vikas Nagpal

    Hi, In order to work properly, the bootstrap structure requires LIN to be active, and consequently, the OUT/S1 pin is connected to GND for the time needed to pre-charge the bootstrap capacitor. With an external bootstrap diode, alternately, the circuit topology/load should allow the OUT/S1 pin to goRead more

    Hi,

    In order to work properly, the bootstrap structure requires LIN to be active, and consequently, the OUT/S1 pin is connected to GND for the time needed to pre-charge the bootstrap capacitor.

    With an external bootstrap diode, alternately, the circuit topology/load should allow the OUT/S1 pin to go at GND level (or lower) from time to time in order to achieve the same result.
    Every time HIN is activated, there should be a residual charge/voltage in the bootstrap capacitor which is more advanced than the UVLO turn-on threshold (maximum).

    I hope this answer helps,
    Regards

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nidhi singh
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nidhi singh
Asked: December 13, 2022In:
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What’s the replacement transistor for STP7NK40ZFP in the DPAK package? It’s no longer manufactured.

What’s the replacement transistor for STP7NK40ZFP in the DPAK package? It’s no longer manufactured.

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dpakmanagementpowerstp7nk40zfptransistor
  1. ashishgawade

    Hello, The STP7NK40ZFP is obsolete however withinside the package TO220FP, not DPAK. If you want this insulated package you may test the STF11N65M2. Regards Ashish Gawade

    Hello, The STP7NK40ZFP is obsolete however withinside the package TO220FP, not DPAK.

    If you want this insulated package you may test the STF11N65M2.

    Regards

    Ashish Gawade

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nidhi singh
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nidhi singh
Asked: December 7, 2022In:
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Hi, I was looking at a schematic that uses the STMPS2161, and the FAULT pin is pulled up to VIN (open drain), still, it isn’t being read. Is it necessary to pull up this pin if it’ll not used or ...Read more

Hi, I was looking at a schematic that uses the STMPS2161, and the FAULT pin is pulled up to VIN (open drain), still, it isn’t being read. Is it necessary to pull up this pin if it’ll not used or can it be left floating?

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managementpinpowerstmps2161
  1. ashishgawade

    Welcome, to the community! The FAULT pin of the STMPS2161 is only used to signal an error. However, you can simply leave it open and unconnected, If you don't query it anyway and therefore do without this signaling. Does it answer your question? Regards Ashish

    Welcome, to the community!

    The FAULT pin of the STMPS2161 is only used to signal an error. However, you can simply leave it open and unconnected, If you don’t query it anyway and therefore do without this signaling.
    Does it answer your question?

    Regards

    Ashish

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nidhi singh
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nidhi singh
Asked: November 22, 2022In:
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Hello, I relate to SDK- CYPD3171-24LQXQ_pb design to make our power bank design. If the type- c is unplugged while the power part is the source, Still, the FW will throw an APP_EVT_DISCONNECT event, If the type- c is unplugged while the power ...Read more

Hello,

I relate to SDK- CYPD3171-24LQXQ_pb design to make our power bank design.

If the type- c is unplugged while the power part is the source, Still, the FW will throw an APP_EVT_DISCONNECT event,

If the type- c is unplugged while the power part is sink, still, the FW will not throw an APP_EVT_DISCONNECT event and throw another APP_EVT_TYPEC_RP_DETACH event and the power path Mosfet does not turn off, why? and how to solve it.

Thank you in advance…

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app_evt_disconnecteventpowersdk
  1. ashishgawade

    Hello, I've made a sink device firmware based on CYPD3171-24LQXQ_pb from Power SDK and verified it on CY4532. the event could be generated successfully once the power source is unplugged. BTW, note the event APP_EVT_TYPEC_RP_DETACH is commented in PB firmware by default. Can you double-check what moRead more

    Hello, I’ve made a sink device firmware based on CYPD3171-24LQXQ_pb from Power SDK and verified it on CY4532.

    the event could be generated successfully once the power source is unplugged.
    BTW, note the event APP_EVT_TYPEC_RP_DETACH is commented in PB firmware by default. Can you double-check what modifications were made to the current firmware?

    Thanks.

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Alex thomas
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Alex thomas
Asked: October 20, 2022In:
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Hii, I’m looking for a programmable buck converter to provide up to 12V/ 2A output with 24VDC input to use it in my design when I ran into STPD01. Could it be possible to use this buck to power up ...Read more

Hii, I’m looking for a programmable buck converter to provide up to 12V/ 2A output with 24VDC input to use it in my design when I ran into STPD01. Could it be possible to use this buck to power up my circuit( not for USB purposes)?

Thanks!

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circuitspowerstpd01usb
  1. vikas Nagpal

    Why would you want to use the STPD01 for such a task when a simple buck converter would fluently cover it? A selection table can be set up then, where you can presently find 14 suitable types,e.g., L6983 or L6986 if you restrict the search to: Grade = Industrial, Input Voltage Max = 30.75 V, OutputRead more

    Why would you want to use the STPD01 for such a task when a simple buck converter would fluently cover it?

    A selection table can be set up then, where you can presently find 14 suitable types,e.g., L6983 or L6986 if you restrict the search to:

    • Grade = Industrial,
    • Input Voltage Max = 30.75 V,
    • Output Current 2.3 A

    Regards

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nidhi singh
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nidhi singh
Asked: October 14, 2022In:
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Hello, I want to use ESP32- S3 for a device that makes no use of WiFi announcement Bluetooth, so I will keep them disabled. My question is what would be the expected current draw with the radio disabled? Trying to figure ...Read more

Hello,

I want to use ESP32- S3 for a device that makes no use of WiFi announcement Bluetooth, so I will keep them disabled. My question is what would be the expected current draw with the radio disabled? Trying to figure out my power supply conditions.

Thanks

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esp32esp32-s3powerradiowifi
  1. Alex thomas

    Hi, You can find this information in the ESP32- S3 datasheet, Table 4- 9" Current Consumption in Modem- sleep Mode".( Modem- sleep mode is the mode where the radios( modems) are turned off. That is your case.) The numbers range from 13mA to 107mA, depending on the CPU frequence, which peripherals arRead more

    Hi,

    You can find this information in the ESP32- S3 datasheet, Table 4- 9″ Current Consumption in Modem- sleep Mode”.( Modem- sleep mode is the mode where the radios( modems) are turned off. That is your case.)
    The numbers range from 13mA to 107mA, depending on the CPU frequence, which peripherals are enabled, and what the CPUs are doing. For example, if the CPU frequency is 80 MHz and both cores are running, the current consumption would be in the range of 33 to 47 mA.

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