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BQ25172:VOUT_OVPの詳細な意味を教えてください

Masanori Yoshida
Prodigy 30 points
Part Number: BQ25172

BQ25172を充電管理用に適用しています。2セルで2.8Vで充電が終了するので原因を調査中です。

ピンTSには固定抵抗10kohmをプルダウンして接続しています。データシートの6.5項の表の

VOUT_OVPが関連あると考えていますので以下ご教示いただければ幸甚でございます。

1.表でrisingとあるのは充電中にこの電圧になると充電が終止する電圧でしょうか。

2.表でfallingというのは充電完了から電圧が下がり　充電を再開する電圧でしょうか。

3.表でcool rangeとは具体的に何度でしょうか。

  • 0
    TI__Guru* 75656 points

    Hello

    TRANSLATION

    BQ25172 is applied for charge management. Charging ends at 2.8V with 2 cells, so we are investigating the cause.

    A fixed resistor of 10kohm is pulled down and connected to pin TS. In the table in section 6.5 of the data sheet

    We believe that VOUT_OVP is related, so we would be grateful if you could tell us the following.

    1.What is "rising" in the table is the voltage at which charging ends when it reaches this voltage while charging?

    2.in the table, "falling" is the voltage at which the voltage drops from the completion of charging and restarts charging?

    3. How many times does the "cool range" mean in the table?

    Reply

    "1.What is "rising" in the table is the voltage at which charging ends when it reaches this voltage while charging?" -- Bill J - V-OUT-OVP rising in 1.70V per cell

    "2.in the table, "falling" is the voltage at which the voltage drops from the completion of charging and restarts charging?" -- Bill J - V-RECHG falling is 1.33V per cell

    "3. How many times does the "cool range" mean in the table?" -- Bill J - V-OUT-OVP-TSCOOL rising is 1.50V per cell 

    A couple of things that will help:

    1.) Can you send a schematic?

    2.) When charge ends at 2.8V what does STAT pin indicate?

  • 0 in reply to Bill Johns
    Prodigy 30 points

    HELLO　Bill Johns

    Thank you for answering. I will contact you again regarding question 3).


    3) What is the temperature of "cool" in "VOUT falling, TS in cool range"?
    4) When charging is completed, "STAT" becomes "HIGH".

  • +1 in reply to Masanori Yoshida
    TI__Guru* 75656 points

    Hi

    "3) What is the temperature of "cool" in "VOUT falling, TS in cool range"?" -- Bill J - The TS cool temp range is 10C to 0C.  But this is set by voltage on TS which is 0.680mV for 10C and 1.04V for 0C.

    "4) When charging is completed, "STAT" becomes "HIGH"? " -- Bill J -- Yes, see table 7-3, when charge is complete the STAT pin will be HIGH (open-drain MOSFET OFF)