Power Supply.md

li-ion batteries with bms require external power supply (e.g. the solar panel)
use source follower as in <![CDATA[]]>https://github.com/LibreSolar/mppt-2420-hc/blob/main/build/mppt-2420-hc_...<![CDATA[]]>
to limit supply voltage (from 100V solar)
use lower voltage buck converter for 12V/3.3V supply
protection against voltage transient
when battery voltage (up to 60V) is available, switch
esp32s3 has 300mA peak current consumption
expect solar input (80V, or more?) at battery terminal


another charger connected in parallel might be faulty passing through solar voltage (happended to me with Victron)
and when battery is disconnected (e.g. BMS cut-off)



3.3C

ESP32-S3 WROOM
802.11g, 54 Mbps, @18 dBm peak 297 mA
<![CDATA[]]>https://www.espressif.com/sites/default/files/documentation/esp32-s3-wro...<![CDATA[]]>

AVG with wifi 120 mA

Suitable Surge Supression

Clamping


TVS (or ZVS)


combined with PTC, Coil, Fuse (see Renesas Book)

MOV
MOSFET


ICs exist (LTC4364)



Source Follower (common-drain)


like in <![CDATA[]]>https://github.com/LibreSolar/mppt-2420-hc/blob/main/build/mppt-2420-hc_...<![CDATA[]]>


as soon as output voltage is available (LV≤60V) the circuit turns-off the source follower
uses a charge pump powered by LV to generate voltage above supply input to switch on a transistor (T2), which
turns-off the
source follower MOSFET Q4
it only protects from surge voltages at the solar input

simple voltage regulator
protects against surge voltages, even longer times
can implement soft-start
min voltage drop: Vgs_th. choose a mosfet with low Vgs_th!


OV Protection


surge voltage (voltage spike, voltage transient)
ZVS + Fuse


Fuses
0679L0375-05

xl7005
LV5144RGYR

<![CDATA[]]>https://www.digikey.de/short/83bbnbjn<![CDATA[]]> (buck 75V)




  

  

  
Vin(max)
  
Iout(max)
  
Iq
  
eff (80Vin, 150mA)
  
eff in:75V out:12V,100mA
  
eff 12Vin/3.3V,100mA
  
$px(100)
  





  
TPP00032
  

  
100
  
300
  
100μA
  

  
72%
  

  
0.22 (out of stock)
  
low stock, sync, FET: 0.75 Ω and 0.4 Ω , light-load operation


  
TPP00031-ES1R
  

  
100
  
300 mA
  

  

  
56%
  

  
0.22
  
sync, FET: 0.75Ω and 0.4 Ω   <![CDATA[]]>PDF<![CDATA[]]>


  
LMR38010FDDAR
  

  
80
  

  
40µ
  

  

  

  
1.81
  



  
LMR38020
  

  
100
  

  

  

  

  

  

  
prog fsw, SPREAD SPECTRUM (EMI)


  
RAA2118034GP3#JA0
  
var freq,DCM
  
80 (84)
  
300mA (3.3V fixed)
  

  
70%  (3.3Vout)
  

  

  
0.87
  
<![CDATA[]]>PDF<![CDATA[]]>


  
TI LV2862XLVDDCR
  

  
60 (65)
  
600
  

  

  

  
83%
  
0.51
  
0.7mhz


  
SCT2A22STER
  

  
100
  

  

  

  
70%
  

  

  
Forced PWM


  
SCT2600
  

  
80
  

  

  

  

  

  

  
pulse skipping (light-load)


  
SCT2A12
  

  
100
  

  
49uA
  

  
85%
  

  

  



  
TI LM5009A
  

  
95
  
300
  

  
78%  (10Vout)
  

  

  
1.33
  
<![CDATA[]]>PDF<![CDATA[]]>


  
TI LM5169/8
  

  
120
  
650/300
  

  
77%
  

  

  
1.33
  
Sync, Fly-Buck™ <![CDATA[]]>PDF<![CDATA[]]>


  
XL7005
  

  
70
  
500
  

  
64% (15Vout)
  

  

  

  
<![CDATA[]]>PDF<![CDATA[]]>


  
MP4541
  

  
80
  
800
  

  
~75%  (10Vout)
  

  

  
1.20
  
<![CDATA[]]>PDF<![CDATA[]]>


  
LM5164
  

  
100
  
1000
  

  
84
  
83%
  

  
2.35
  
sync, FET: 0.725Ω and 0.34Ω, <![CDATA[]]>PDF<![CDATA[]]>


  
LM5163DDAR
  

  
100
  
500
  

  
82
  
83% (60Vin)
  

  
1.61
  
sync, FET: 0.725Ω and 0.34Ω, <![CDATA[]]>PDF<![CDATA[]]>


  
XL7015
  

  
100
  
300
  

  
70
  

  

  

  
<![CDATA[]]>PDF<![CDATA[]]>


  
XL7005
  

  
80
  

  

  
60
  

  

  

  
<![CDATA[]]>PDF<![CDATA[]]>


  
TX4139
  

  

  

  

  
75%
  

  

  

  



  
LM5116
  

  
100
  

  

  

  

  

  
3.80
  



  
LM5007
  

  
80
  
700
  

  
79%
  

  

  
2.11
  



  
LMR16006X
  

  
60
  
600
  

  

  

  

  
1.96
  
LibreSolar/mppt-2420-hc


  
LMR51606XDBVR
  

  
65
  
600
  

  

  

  

  
0.58
  





Good drop-in for 3.3 and 12V rails, 80,100V:


LMR38020SDDAR ($1.86 PFM, 80V, prog fsw)
LM5163DDAR ($1.6, COT, 100V, prog fsw) <-- pick
SCT2A12 ($.35 marketplace, PFM, 100V, 390khz
fs) <![CDATA[]]>https://www.silicontent.com/uploads/admin/file/20240809/20240809110531_1...<![CDATA[]]>

LM5009A (150mA)


PFM: better light-load eff (pulse skipping)
FPWM: lower ripple, tighter regulation  (forced pwm)

MP4541

12 -> 3.3V: @ 100 mA
<![CDATA[]]>https://www.digikey.de/short/bpfjh3m8<![CDATA[]]>

AP63203WU-7: 88%, 22µA Iq, 2A max, 0.5 € (100x)
TPS62172DSGT: 84%
TPS560430: 84%
TPS51383: 92 %, 80-μA Iq, 8A max, 0.53€ (100x)
RAA2118034GP3#JA0

LM5146 (external fets)

Diodes


DFLS1100


3.3V ZVC protection

ESP32 has internal ESD protection. we need ZVS for lightning and voltage transient protection.
usually these diodes have a peak power of 600 W.




  

  

  
Vrwm
  
Vbr
  
Vcl
  
Ippm
  





  
Littlefuse SMF3.3
  
.4€
  
3.3
  
3.4
  
6.8
  
30A
  
200W


  
Vishay SMBJ3V3-E3/52
  
.4€
  
3.3
  
4.1
  
10.3
  
200A
  
600W


  
ST SM2T3V3A
  
.6€
  
3.3
  
3.6
  
6.8
  
30A
  



  
ST SMLVT3V3
  
.8€
  
3.3
  
4.1
  
10.3
  
200A
  
600W


  
NXP PTVS3V3S1UR,115
  
.4€
  
3.3
  
5.2
  
8
  
44A
  
350W





Vishay SMBJ3V3-E3/52 (.4€)



Surge Protect:
<![CDATA[]]>https://ir.canterbury.ac.nz/items/e7c8c3da-042c-4d4a-9b7b-2b93970b0d82<![CDATA[]]>

Boost 3.3 -> 12V .


one FET needs ~< 50mW gate-drive power
4 FETs at 10V need 20 mA @ 40 kHz
20mA@12V = 240mW, 20mA@80V = 1.6W
AP3012KTR-G1 @ 20mA has 75% eff.


$.24 + 10uH(.4$) + D=1N5819 (C: X5R or X7R Dielectric, L: SUMIDA CDTH3D14/HPNP-100NC or Equivalent)
⇒ for <$1 a 75% eff. solution (better than using another 100v→10V buck)
consider using using a 100V diode maybe after C_out to protect any HV