View source for CN3722

== Mutil-Cells Battery Charge Mangement ==
<gallery>
File:Cn3722_datasheet.jpeg| CN3722 datasheet, 
File:Cn3722_fb_voltage.png | CN3722 Fb resistor setup
</gallery>
=== Features and Use Guide of CN3722 ===
* datasheet please see datasheet section below
* Support multi-cells, 5A max.
* Photovotaic MPPT Function
* Trickle-current charge, CC and CV charging Mode
<br />
Board usage
* Trickle - on board backside R9 resitor to pin8, can be used to enlarge the trickle-current charge current.

* All following information from datasheet

* Detect constant-current charge current = Ics, according to datasheet Ics = 200mV/Rcs, board example:
 Ics = 200mV / ( 2 x parallel 0.33R = 0.17R ) = 1.17A

* Detect Fb voltage = 2.416 * (1 + R7/R6) + (Ib x R7), in case (Ib x R7) is difference, Ib normally 50nA, we simply igore it first here, board example:
 Vfb (Vbat) = 2.416 * (1 + R8/R9) = 2.416 * (1 + 13.7K/28K) = 3.589V, around 3.6V

* MPPT voltage setup, board example
 Vmppt = 1.04 x ( 1 + 220K / 13.7K)
==== Notice ====
* Charge voltage VCC should be always 2V higher than stop voltage of battery, for example, if you have 3x  4.2V = 12.6, please supply 15V.
* Parts selection guide, refer from datasheet 
{| class="wikitable sortable"
|-
! Header text !! Header text !! Header text
|-
| Example || <2.5A || 2.5A—5A
|-
| Diode D1 D2 || 30BQ015 || 50WQ03FN。
|-
| Mosfet || AO3407A|| SI4435DY
|}
* Rcs, 1A -> 2ohm, 2A -> 1ohm, 3A -> 0.067ohm, 4A -> 0.05ohm, 5A -> 0.04ohm,

[[category: Solar Charger]]