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Lithium-Ion Charger (1)

Lithium-Ion Charger (1)
Lithium-Ion Charger (1)
There are several ICs on the market that are specially designed for charging Lithium-Ion batteries. The LM3647 from National Semiconductor is one of those. The manufacturer describes this clever, 20-pins integrated electronics as a universal charge controller for Ni-Cd, Ni-MH and Li-Ion batteries. The IC can use a pulsed or constant charge current and can also be set up to discharge the battery before the charging process starts. During this process the LM3647 monitors the battery voltage, the time and (if required) the temperature. As soon as anything appears to go wrong, the charge current is stopped.
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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

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PCB

Component list

Resistors:
R1,R2,R3,R8,R26 = 1kOhm
R4,R11 = 100kOhm
R5,R9 = 3kOhm 3
R6 = 15kOhm
R7 = 2kOhm 2
R10 = 1kOhm 5
R12 = 22kOhm
R13 = 27kOhm
R14,R17 = 100kOhm 1%
R15,R16 = 4kOhm 7 1%
R18,R23,R24,R25,R27,R28 = 10kOhm
R19 = 5Ohm 10W
R20 = 16kOhm 5 1% (61kOhm 9 1%)
R21 = 30kOhm 9 1% (30kOhm 1 1%)
R22 = 0.05 Ohm 1W
Capacitors:
C1 = 0-100nF (22nF)
C2 = 68pF
C3,C12 = 10µF 63V radial
C4 = 47nF
C5,C6,C10,C13,C14 = 100nF
C7,C8,C9 = 1µF MKT
C11 = 100µF 10V radial
Semiconductors:
D1,D2,D3 = LED, high efficiency
D4 = BAT85
D5 = LM4040a-2.5 Z
D6 = 1N5401/SB530
T1 = BS170
T2 = BUZ71/BUZ 11
T3 = BC547B
T4 = TIP121/TIP142
IC1 = LM3647 IM (National Semiconductor)
IC2,IC3 = LM7301 / TLC271
IC4 = 78L05
Miscellaneous:
JP1,JP2 = 3-way jumper
K1,K2 = 2-way PCB terminal block, lead pitch 7.5mm
BZ1 = buzzer 6V
Heatsink for T4: e.g., Fischer type SK59 (Dau Components)

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