STHV748 Power-up / Power-down voltage sequence

[serghei]

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

[ricciardo.antonio]

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=falseSTEVAL-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

[serghei]

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.