1.IP5407. Battery management SOC chip, integrated DCP function, model IP5407, is a lithium battery charging chip. Power bank, a portable charger that can directly charge a mobile device and has its own storage unit.
2. In the field of consumer power supply, Nanxin's SC8902A and SC8812A chips are known in Xiaomi and HONORThe marking, clasps and double-sided tape secure the bottom cover. After successfully removing the bottom cover, you will see the four holding screws on the edge of the mobile power supply. At the same time, note that the inside of the bottom cover is equipped with insulation gaskets.
2, the main control, Deyi BQ24195, as before after the test, the charging current is still the maximum 1A. The following will be the punch current and voltage test, protection test, shutdown cut-off test, efficiency test. It can be seen that the millet 16000 MA mobile power supply is absolutely safe and can be used with confidence.
3, the specific model of Mi 5000mAh is NDY-02-AM,Rated capacity 7V/5000mAh, the official nominal input current is 0A, output current is 1A; This way, with a 5V/2A charger and standard data cable, it takes only 5 hours to fill up the power supply.
4, the opening steps are as follows: Tool: Millet charging treasure. The removal of the mobile power supply is relatively simple, and the bottom cover marked with the buckle and the double-sided adhesive surface need to be removed before the removal of the machine.
5, millet wireless charging treasure uses an integrated plastic shell, which can only be violently disassembled. Open the shell of the wireless charging surface, inside is the wireless charging coil and thermistor, and the upper circuitThere's a shield on the board. Remove the wireless charging coil to expose the battery.
6, with a small tool is a small screw batch, gently pry open along the top edge, pay attention to the small buckle inside. After opening the small plastic plate that had been pry open, the black panel was found, and the panel had transparent two-sided glue, and four small star screws were found. Use the star screwdriver to unscrew the four set screws.
1, pin function: 1 INInverting input to V error amplifier. 2 Output pin of COMP error amplifier. A feedback compensation network is connected between this pin and the INV pin. 3 MULT multiplier input pin. The full range of AC voltage is distributed 2V to the MULT pin.
2, the power management chip 8 pin description pin (COMP) is the error amplifier compensation foot. The RC compensation network should be connected between the pin and the inverting input of the error amplifier (VFB) to improve the performance of the error amplifier. The foot (VFB) is the inverting input of the error amplifier.
3 SGThe M4151 chip is a highly efficient power management chip for portable devices and low-power applications in battery-powered devices.
4, power management chip. The power management chip of the shared charging treasure is not charged, and the power management chip of the charging treasure is in working state when charging, and heating is a normal phenomenon. However, when not charging, the charging treasure is in the open state. The battery is empty and there is no current output, and it should not be hot.