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CN3722 Datasheet(PDF) 11 Page - Shanghai Consonance Electronics Incorporated

No. de pieza CN3722
Descripción Electrónicos  5A, Multi-Chemistry Battery Charger IC With Photovoltaic Cell MPPT Function
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Fabricante Electrónico  CONSONANCE [Shanghai Consonance Electronics Incorporated]
Página de inicio  http://www.consonance-elec.com/
Logo CONSONANCE - Shanghai Consonance Electronics Incorporated

CN3722 Datasheet(HTML) 11 Page - Shanghai Consonance Electronics Incorporated

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CONSONANCE
www.consonance-elec.com
11
Rev.1.1
diode and the pass transistor should also be kept as short as possible.
(2) The compensation capacitor connected at the COM1, COM2 and COM3 pins should return to the analog
ground pin of the IC. This will prevent ground noise from disrupting the loop stability.
(3) Since MPPT pin’s voltage is a function of ambient temperature, while designing the PCB, CN3722 should
be kept away from the heat source such as diodes, MOSFET, etc.
(4) Output capacitor ground connections need to feed into same copper that connects to the input capacitor
ground before tying back into system ground.
(5) Analog ground and power ground(or switching ground) should return to system ground separately.
(6) The ground pins also works as a heat sink, therefore use a generous amount of copper around the ground
pins. This is especially important for high VCC and/or high gate capacitance applications.
(7) Place the charge current sense resistor RCS right next to the inductor output but oriented such that the IC’s
CSP and BAT traces going to RCS are not long. The 2 traces need to be routed together as a single pair on the
same layer at any given time with smallest trace spacing possible.
(8) The CSP and BAT pins should be connected directly to the current sense resistor (Kelvin sensing) for best
charge current accuracy. See Figure 4 as an example.
Figure 4 Kelvin Sensing of Charge Current


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