2014-11-11 12:34 AM
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-down2015-01-07 01:41 AM
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=false2015-04-07 02:33 AM
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.