isl6251A充电解释概论.docx

1、isl6251A充电解释概论boot启举升压UGATE上管驱动PHASE适配器交流反馈,CSOP/CSON充电电流检测，CSIP/CSIN整机电流检测DCIN:供给内部线性模块供电ACSET :夕卜接VIN的分压节点，用来判断适配器电压大小ACPRN :当ACPRN大于1.26V时，为低,表示适配器存在,EN :充电开启CM :整机工作电流检测输出VDD :线性稳压VDDP：来自VDD的供电，ICOMP:电流补偿，VCOMP :电压补偿CELLS:电池组设定VADJ:单节电池电压设定CHLIM:充电电流大小设定ACLIM:整机工作电流大小设定VREF:参考电压PWM部分BOOTConnect

2、BOOT to a 0.1pF ceramic capacitor to PHASE pin &nd connect to the cathode of the bootstrap schottky diode.UGATEUGATE is the high side MOSFET gate drive outputLG ATELG ATE is the low side MOSFET gate drive outpu t; swing between OV and VDDP.PHASEThe Phase connection pin connects to the high side MOSF

3、ET source, output inductor, and low side MOSFET drain.检查输入电流和输出电流部分CSOP/CSONCSOP/CSON is the battery charging current sensing positive/negative in put. The differential voltage across CSOP and CSON is used to sense the battery charging current, and is compared with the charging current limit thresho

4、ld to regulate the charging current. The CSON pin is also used as the battery feedback voltage to perform voltage regulation.CSIP/CSINCSIP/CSIN is the AC adapter current sensing positive/negative in put. The differential voltage across CSIP and CSIN is used to sense the AC adapter current, and is co

5、mpared with the AC adapter current limit to regulate the AC adapter current.适配器识别部分capacnor iroru ujin io ACSETACSET is an AC adapter detection input. Connect to a resistor divider from the AC adapter output.ACPRNOpen-drain output signals AC adapter is present. ACPRN pulls low when ACSET is higher t

6、han 1.26V; and pulled high when ACSET is lower than 1.26V.ACSET和ACPRN的关系芯片的LDO输出部分 条件DCINThe DCIN pin is the input of the internal 5V LDO. Connect it to the AC adapter output. Corinect a 0.1 liF ceramic capacitor from DCIN to PGND.2 LDO产生I IVDDVDD is sn internal LDO output to supply IC analog circui

7、t. Connect a 1liF ceramic capacitor to ground.VDDPVDDP is the supply voltage for the low-side MOSFET gate driver. Connect a 4.7Q resistor to VDD and a 1 llF ceramic capacitor to power ground.3 LDO解釋PARAMETERTEST CONDITIONSMINTYPMAXUNITSSUPPLY AND BIAS REGULATORDCIN Inpu! Voltage Rare725VDCIN Quo$3nt

8、 CurrrtEN = VDD Of GMD. 7V DCIN 25V1.43mABatl&y Leakage Cum 合 7DCIN 0. no load31GPAVDD CXitpu! VoftagaRegiiation7V 三 DCIN 25V. 0 Igo 的mA4.9255.0755.225V4 DCIN与VDD的关系VDD电池设定部分CELLSThis 卩in is usedo select the battery voltage CELLS = VDD for a 4S battery pack, CELLS 二 GND fora 3S battery pack, CELLS =

9、 Float for a 2S battery pack.VADJVADJ adjusts battery regulation voltage. VADJ = VREF for 4.2V十5%/cell; VADJ = Floating for 4.2V/cell; VADJ = GND for 4.2V-5%/celL Connect to a resistor divider to program the desired battery cell voltage between 4.2V-5% and 4.2V+5%.CELLS=VDD 时，为 4 串=GND时，为3串整机电流与输入电流

10、的关系适配器输出电流既是整机电流ICM1CMICM is the adapter current output The output of this pin produces a voltage proporticial to the adaptecurrent.充电开启enENEN is the Charge Enable input. Connecting EN to high enables the charge control function, connecting EN to low disables charging functions. Use with a thermisto

11、r to detect a hot battery and suspend charging.功率地PGNDPGNDPGND is the power ground Connect PGND to the source of the low side MOSFET for the low side MOSFET gate driver.ICOMP是电流坏路放大器,主要是对检测适配器电流输入信号的放大VCOMP是电压环路放大器,主要是对电池充电电流输入信号的放大ICOMPICOMP is a current loop error amplifier output.VCOMPxjVCOMP is

12、a voltage loop amplifier output对AC和电池充电的电流设定CHUMCHLIM is the battery charge current limit set pin. CHLIM input voltage range is)Q.1V to 3.6V. When CHLIM = 3.3V, the set point for CSOP-CSON is 165mV. The charger shuts down if CHLIM is forced below 88mV.ACLIMACLIM is the adapter current limit set pin.

13、 ACLIM = VREF for 100mV, ACI_IM = Floating for 75mV, and ACUM = GND for 50mV. Connect a resistor divider to program the adapter current limit threshold betwee n 50mV a nd 100mV.计算公式充电电流的计算公式他与充电电流设定脚CHLIM的电压有关系和充电的检测电阻有关系整机输入电流计算公式他与VREF有关系和适配器电流设定脚ACLIM的电压有关系整机工作电流ICM的计算公式Current MeasurementCSIP an

14、d CSIN. The output voltage range is 0 to 2.5V. The voltage of ICM is proportional to the voltage drop acrossCSIP and CSIN, and is given by the following equation:ICM =他与适配器输入的电流Iinput有关系和输入检流电阻 关系故障问题简单思路在充电芯片不发出UGATE的时候1.先查EN信号是否大于1.06V2再查CHLIM是否为0也就是看CHLIM得电压是否为0 ,如果充电这个引脚的电Vchlim的电压肯定在上升若为0 ,则不充电

15、是吧会有UGATE吗 没有若在不充电的时候，我们测量到ICM等于1.99V的时候，此时插入电池，还可 以充电吗？那么不能充电，EC是控制了 EN还是CHLIM呢？还是同时控制了呢？常的设计师,应该会这么去设计，让EN信号为高，让CHLIM为低随着ICM的降低，而逐步抬高CHLIM因为让E信号为高，是因为检测到电池电量不足。需要充电所以在条件判断的时候，这样子做，更加好做大家在修到ISL6251的时候维修充电的时候可以直接干大招先调试充电在不让EC参与的情况下，自动充电如何做呢？通过人工调试充电，就可以做到判断问题的前后关系1:先看电池是多少组的，设定好CELLS因为有的机器，在CELLS与VA

16、DJ上 是靠EC来控制。所以,有的板子在调试的时候 需要人工的先设置好电池上有额定电压是多少V的就可以知道了2:设定VADJ3:人工开启EN ,接大于1。06V电压4:设定充电电流CHLIN ,这个可以慢慢的加电压,比如从0。01到IV,可以看到稳 压电源上的充电电流5就可以看是否有充电电流来界定问题点的前后关系对于充电充不满 这类问题，是比较模糊的概念，因为不知道是检测电池的电量上出了问题，还是EC发 出控制充电上出了问题还是那里出了问题所以就可以通过这样子人工来充调试充电芯片是吧若能充满则为EC的资料坏,或者是其他设定方面的信号有问题了充电速度慢充电速度过快若电池好的情况下那者跖充电电流的设定有关系因为CHLIM过大，过小都会影响这些问题原本的问题不是充电到80%之后就不充了吗？因为充电关闭了嘛那么我纟雀续人工开始充嘛 来看是那里的问题