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serghei
Visitor II
November 11, 2014
Question

STHV748 Power-up / Power-down voltage sequence

  • November 11, 2014
  • 2 replies
  • 799 views
Posted on November 11, 2014 at 09:34

What the correct power-up/power-down voltage sequence? In datasheets on STHV748 and demo boards  with STHV748, voltage sequence is different.

#sthv748-power-up-power-down
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    2 replies

    R
    ricciardo.antonio
    Visitor II
    January 7, 2015
    Posted on January 07, 2015 at 10:41

    Dear Serghei,

    Basically the Power-UP sequence in DSrather thanAN has to be same ... below you can refer to a pratical instructions on how to proceed applying the power supplies on the demo kit:

    Power-UP is correctly imposed:

    - 3-Level 1-->

    2--> 3--> 4-->

    5 (see attachement STEVAL-IME003V1_Powerup_3level.png)

    - 5-Level 1-->

    2--> 3--> 4--> 5--> 6-->

    7 (see attachement STEVAL-IME003V1_Powerup_5level.png)

    Than for Power-DOWN MUST BE RESPECTED the reverse procedures as followed:

    - 3-Level

    5--> 4--> 3--> 2--> 1

    (see attachement STEVAL-IME003V1_Powerup_3level.png)

    - 5-Level

    7--> 6--> 5--> 4--> 3--> 2--> 1 (see attachementSTEVAL-IME003V1_Powerup_5level.png)

    Best Regards

    Antonio

    ________________

    Attachments :

    STEVAL-IME003V1_Powerup_3level.png : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Hz0N&d=%2Fa%2F0X0000000bIl%2FiXixXGBVpR35fMfJtV9fpxA13qchIGS.EPMfHHDLBww&asPdf=false

    STEVAL-IME003V1_Powerup_5level.png : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Hz7T&d=%2Fa%2F0X0000000bIk%2FuXZTDS5b3m_IuWM5mwDthGRWIg9CZ2UWpKoQmsuAr6M&asPdf=false
    S
    sergheiAuthor
    Visitor II
    April 7, 2015
    Posted on April 07, 2015 at 11:33

    Hi !

    I have few questions about STHV748.

    1. High current consumtion (> 200ma) on VDDP and VDDM if I applying power supplies how described in STEVAL-IME003V1_Powerup_5level.png (Each step of power sequence  = 10ms). If I applying VDDP,DVDD and VDDM in same time - STHV748 works fine.

    2. Two ICs was damaged after next signal

     -85V (200ns)/+85V(200ns)/clamp

     (+85V (200ns)/-85V(200ns)/clamp IC works fine !!!)

     another IC seems (i'm not sure) was damaged after

     -85V (160ns)/clamp (40ns)/+85V(160ns) or +85V (160ns)/clamp (40ns)/-85V(160ns)

    PS: DVVD=VDDP=3V, VDDM=-3V, HVP0=+85V,HVM0=-85V,HVP1=+50V,HVM1=-50V. Load - piezo transducer. Cable lenght =1.5m.

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