BOM-DAT/Resistor-Dat/resistor-feedback-dat/resistor-feedback-dat.md
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@@ -58,6 +58,21 @@ for - [[li-battery-dat]]
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= 25.2 / 1.205 - 1 = 19.9, R4 = 19.9 ⅹ R5, if R5 = 100k, R4 = 1990k, use 2M
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+## CN3722
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+
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+Vbat = 2.416 × (1 + R7 / R6)
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+
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+where R7 = 14K
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+
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+| Battery Type | Vfb (kΩ) | Output Voltage (V) |
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+|--------------|----------|--------------------|
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+| LIFEPO4 | 28.7 | 3.6 |
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+| LIFEPO4 | 7.5 | 7.2 |
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+| LIFEPO4 | 4.02 | 10.8 |
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+| Li+ | 19.1 | 4.2 |
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+| Li+ | 5.76 | 8.4 |
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+| Li+ | 3.3 | 12.6 |
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+
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BOM-DAT/diode-dat/diode-dat.md
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@@ -122,6 +122,8 @@ For lower power consumption and higher efficiency, the rectifier diode (D1 in Fi
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- The current handling capability should be greater than the maximum output current (I<sub>F</sub> > I<sub>OUT,max</sub>).
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- The peak forward current should be greater than the peak current of the inductor (I<sub>FSM,peak</sub> > I<sub>L,peak</sub>).
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+alternatives: SS14 / SS34 / SS54
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+
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## ref
BOM-DAT/mosfet-dat/mosfet-dat.md
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@@ -43,7 +43,7 @@ common brand: [[Vishay-dat]]
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| IRF540N | 540N | [[Infineon-dat]] | 33A | TO-263 / TO-220 | N | 100V |
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| IR F5305 | 5305 | [[Infineon-dat]] | -31A | TO-220 | P | 55V |
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| IR [[FR1205-dat]] | | [[Infineon-dat]] | 44A | TO-252 | N | 55V |
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-| AO4435 | | [[AOSMD-dat]] | -10.5 | SO-8 | P | 30V |
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+| AO4435 / SI4435 | | [[AOSMD-dat]] | -10.5 | SO-8 | P | 30V |
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| AO4468 | | [[AOSMD-dat]] | 10.5 | SO-8 | N | 30V |
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| AO3400 | A0T0 | [[AOSMD-dat]] | 5.8A | SOT-23 | N | 30V |
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| AO3401 | A19T | [[AOSMD-dat]] | 4.3A | SOT-23 | P | 30V |
Board-dat/OPM/OPM1146-dat/OPM1146-dat.md
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@@ -17,6 +17,8 @@ legacy wiki page - https://www.electrodragon.com/w/Battery_Charge
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- All the rest SMD resistors are included in the package.
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- Supply VCC should be +2V > Vbat
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+Notice the import solar panel voltage is set to 15V, based on [[MPPT-dat]]
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+
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## Board Functions
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... ...
@@ -49,4 +51,10 @@ Setup for V_fb
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## ref
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-- [[CN3722-dat]] - [[battery-dat]]
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\ No newline at end of file
0
+- [[CN3722-dat]] - [[battery-dat]]
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+
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+- [[mosfet-dat]]
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+
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+- [[MPPT-dat]]
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+
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+- [[CN3722]] - [[consonance]]
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\ No newline at end of file
Chip-cn-dat/CONSONANCE-dat/CN3722-dat/2025-08-27-18-22-27.png
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Binary files /dev/null and b/Chip-cn-dat/CONSONANCE-dat/CN3722-dat/2025-08-27-18-22-27.png differ
Chip-cn-dat/CONSONANCE-dat/CN3722-dat/CN3722-dat.md
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@@ -11,8 +11,54 @@ Wide Input Voltage: 7.5V to 28V
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+## CSP
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+
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+Positive Input for Charging Current Sensing. CSP and BAT pin measure the
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+voltage drop across the sense resistor RCS to provide the current signals required.
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+
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+### Charge Current Setting
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+
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+The full-scale charge current, namely the charge current in constant current mode, is decided by the following formula:
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+
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+![](2025-08-27-18-22-27.png)
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+
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+Ich = 200mv / Rcs
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+
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+Where:
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+- Ich is the full scale charge current
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+- Rcs is the resistor between the CSP pin and BAT pin
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+
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+if Ich = 3A then Rcs = 0.067 ohm
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+
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+if Rcs = 0.165 ohm then Ich = 1.2A
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+
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+
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+
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+### Set the Regulation Voltage in Constant Voltage Mode
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+
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+As shown in Figure 1, battery voltage is fed back to the FB pin via the resistor divider composed of R6 and R7.
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+CN3722 determines the charging status based on the FB pin voltage.
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+
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+When the FB voltage approaches 2.416V, the charger enters constant voltage mode. In constant voltage mode, the charge current gradually decreases, and the battery voltage remains unchanged.
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+
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+Considering the FB pin’s bias current, the regulation voltage in constant voltage mode is determined by the following equation:
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+
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+ Vbat = 2.416 × (1 + R7 / R6) + Ib × R7
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+
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+Where Ib is the FB pin’s bias current, typically 50nA.
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+
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+From the above equation, we can see that an error is introduced due to the bias current Ib; the error is Ib × R7.
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+
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+If R7 = 500kΩ, then the error is about 25mV. So this error should be taken into account when designing the resistor divider.
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+
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+The regulation voltage range that can be set is from 3V to 25V.
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+
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+- [[resistor-feedback-dat]]
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+
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## ref
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18 62
- [[CN3722.pdf]]
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+
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+- [[diode-dat]]
power-dat/solar-dat/MPPT-dat/MPPT-dat.md
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@@ -15,6 +15,9 @@ The solar panel maximum power point voltage is determined by the following formu
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**if R6 == 100K and Vmpp == 18V, then R5 = 1.4M**
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+for Vmpp = 1.04 × (1 + R5 / R6) in [[CN3722-dat]]
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+
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+**if R6 = 16K, and R5 = 220K, then Vmpp = 14.3V**
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MPPT pin for adaptive charging current
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