• LTC4020 Fault problem

    Hello everyone,

    I made a board with input 15V-42V and output 33.5V referring to the DC2044A demo board of LTC4020.

    Test stage: No battery is connected. 20V input no-load current 5.5-6mA (including indicator LED), then increase the load 33.55W, the efficiency…

  • LTC4020的损坏问题

    大家好,我参照LTC4020的DC2044A演示板,制作了一块输入15V-42V,输出33.5V的板子。

    测试阶段:未连接电池.20V输入空载电流5.5-6mA(含指示LED),随后增加负载33.55W,效率96.7%。再开始调节输入电压15-35V开始观察效率,突然效率下降,恢复输入电压20V后,效率仅87%。输出MOS发热。断开负载后,空载电流增加到了25mA。断电测量31引脚TG2口对32口SW2短路(10-50欧姆)。

    相同故障发生了3次,损坏了3颗LTC4020.附件上传了LTC4020部分原理图和整机PCB图…

  • LTC4020 Charging Mode Problem (BGATE)

    Hello Support Team,

    I am using the LTC4020 to design a versatile charger for a 10S2P battery, with an input of 30 VDC to 48 VDC.

    I fixed resistor network (200k and 12k7), so VFB =41.87 V, VFBMAX=46.06 V, VFBMIN=35.59 V.  Also I´ll use a jumper to change…

  • LTC4020 Output voltage oscillates with 15mA load

    I want to charge 4S 6Ah LiFePO4 battery pack.

    The charge current is 1.5A. Input voltage is 24V and output voltage is 29V.

    I am using the same compensation values for ITH and VC with DC2134A eval board.

    The thing is, Output voltage oscillates with 15mA load…

  • LTC4020 - Limit in recharge current

    Hello Engineers,
    I am using the LTC4020 as a battery charger for Li-Ion cells (6s1p) in a motorbike applications. Following few characteristics of my system:

    Vin : [10; 26] V

    Vout = Vbatt : [13.8; 25.2] V

    Max. Recharge Current = 6.3 A

    Pin MODE connected…

  • LTC4020 14,4V@16A

    Greetings everyone!
    I am designing a power supply for my project.

    Switching frequency: 500 kHz - to be agreed upon additionally if necessary
    Input voltage: 7.8 ... 16V
    Output voltage: 14.6V
    Maximum continues output current: 16A
    Charging current (max continues…

  • LTC4020 VOUT current limit question?

    Hello Engineers !

    I recently assembled a prototype board and facing now a problem with current output issue.The board is to be used in battery charging purposes, but for now I have tested the board from the VOUT output only with Charging circuit disabled…

  • LTC4020 compensation( ITH pin )

    I want to charge 4S 6Ah LiFePO4 battery pack.

    The charge current is 1.5A. Input voltage is 24V and output voltage is 29V.

    I am using the same compensation values for ITH and VC with DC2134A eval board.

    I don't understand mean of  Bring to regulation …

  • LTC4020 charging issue

    Hi ADI Expert,

    I have a question about the charging behavior,

     

    1. I set the LTC4020 in Lead-Acid charging mode.
    2. In this project, 

        Absorption Voltage = 28.806V

        Float Charge Voltage = 26.646V

        Trickle Charge Voltage = 20.164V

        Bulk Recharge Voltage …

  • LTC4020直接带负载时输出振荡

    采用LTC4020设计8串磷酸铁锂电池充电和29V输出6A的电源,利用DC2134A-2的电路和补偿值;24V供电时,出现充电正常,带20mA左右负载时输出电压振荡,参考PDF文档需要调补偿值。请问VC引脚补偿调节时,检测电感电流时,是否需要将电流探头串入贴片电感输出?这样不好实施,能否直接测输出电流?另外能否提供详细的测量示意图。另外LTC4020手册中的控制方块图一些符号哪里能找到说明?有些不太理解,例如这个图中的箭头和电流限制功能。谢谢!