Switching Battery Charger with L296 - del20031
This circuit is derived from an application note of
L296, It is a Power Switching Regulator from ST
Micro. This technology saves power means less heat
and smaller size PCB.
and Power control Automation
L296 is a switch mode power controller here. In this
NTE327 or 2N5038 is used to boost the current
output. This transistor is both high current and
fast switching. U1A, LM358 measures the load current
by reading the voltage across shunt R6 and compared
to a current limit setting at R14 using U1B to give
a load current control. R7-R8 give a voltage
feedback for voltage limit.
U1A is wired as a diffrential amplifier and U1B a
High Gain Comparator. C4 and C5 are parallel for
Charger with L296 - del20031
Can be Scrolled by Drag-Drop Left-Click-Mouse.
Use MFR 1% for all Resistors, 33E means 33 ohms, 22K
means 22 kilo ohms, 1M is 1 megohm. 10T tp means ten
turn trimpot. "Analog Ground" and "Digital Ground"
must be linked at power supply only, avoid loops,
let grounds radiate from a ground plane. Unused
inputs of logic and opamps pull up or down to avoid
oscillations and noise. Connect supply of all chips
if not mentioned.
Management and Supply Design
Put a 104 CD cap (0.1uF Ceramic Disc) for all ICs
from positive to negative close to IC, even if
omitted in circuit. Opamps on dual supply rails two
caps. Circuit is a design, some of my designs are
not yet tested, use only for Education and
Information. Use it as an idea for study dont expect
it to work out of the box. BUX39 can also be tried
for Q1, we need 15A+ -- 100V -- <1uS. L1 =
220uH 15A, 50T turns 0.5mm Cu Wire on Hi-Freq
Torroid. 10A Current carrying tracks must be
reinforced by copper braids or wires.