As you asking How to Charge the NI NH Battery Circuit here I am Telling you About to Charge the NI NH Battery Circuit


A single state-of-the-art chip, a transistor and a few other
inexpensive passive components are the only materials required for making this outstanding, self regulating, over charge controlled, automatic NiMH, NiCd battery charger circuit

NiMH, NiCd battery charger circuit easier, let's go through the data with the following instructions:

DRIVE (pin #1): The pin is connected to the base of the external PNP transistor and is responsible for providing the base bias to the transistor. This is done by applying a constant sink current to the base of the transistor. The pin out has current protected output.

BAT (pin #2): This pin is used to monitor the charging current of the connected battery while it is being charged by the circuit.

SENSE (pin #3): As the name suggests it senses the charging current applied to the battery and controls the conduction of the PNP transistor.

TIMER (pin #4): It defines the oscillator frequency of the IC and helps to regulate the charge cycle limits along with the resistor that’s calculated at the PROG and GND pin outs of the IC.

SHDN (pin #5): When this pin out is triggered low, the IC shuts down the charging input to the battery, minimizing the supply current to the IC.

PAUSE (pin #7): This pin out may be used for stopping the charging process for some period of time. The process may be restored by providing a low level back to the pin out.

PROG (pin #7): A virtual reference of 1.5V across this pin is created through a resistor connected across this pin and ground. The charging current is 930 times the level of the current that flows through this resistor. Thus this pin out may be used for programming the charging current by altering the resistor value appropriately for determining different charging rates.

ARCT (pin #8): It’s the auto recharge pin out of the IC and is used for programming the threshold charge current level. When the battery voltage falls below a preprogrammed voltage level, the charging is reinitiated instantly.

SEL0, SEL1 (pin #9 and #10): These pin outs are used for making the IC compatible with different number of cells to be charged. For two cells, SEL1 is connected to ground and SEL0 to the supply voltage of the IC

For charging three cells in series SEL1 is rigged to the supply terminal while SEL0 is wired up to the ground. For conditioning four cells in series, both the pins are connected to the supply rail, that is to the positive of the IC.