LTC1042CN8 Linear Technology, LTC1042CN8 Datasheet - Page 7

• Manufacturer Part Number: LTC1042CN8
• Description: IC CMOS COMPARATOR WINDOW 8DIP
• Manufacturer: Linear Technology
• Series: LTCMOS™r
• Type: Windowr

Specifications of LTC1042CN8

• Number Of Elements: 1
• Output Type: TTL
• Voltage - Supply: 2.8 V ~ 16 V
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
Wind Powered Battery Charger
A simple wind powered battery charger can be
constructed using the new LTC1042, a 12V DC permanent
magnet motor, and low cost power FET transistor.
The DC motor is used as a generator with the voltage
output being proportional to its RPM. The LTC1042
monitors the voltage output and provides the following
control functions:
1) If generator voltage output is below 13.8V, the control
circuit is active and the NiCad battery is charging
through the LM334 current source. The lead acid
battery is not being charged.
WIND
BATTERY
NiCAD
4.5V
U
LM334
215k
10k
U
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
GENERATOR
LT1004-1.2
12V
W
100k
68Ω
U
1
2
3
4
LTC1042
10k
2) If the generator voltage output is between 13.8V and
3) If generator voltage exceeds 15.1V (a condition caused
This charger can be used as a remote source of power
where wind energy is plentiful, such as on sailboats or
remote radio repeater sites. Unlike solar powered panels,
this system will function in bad weather and at night.
107k
15.1V, the 12V lead acid battery is being charged at
about a 1A/hour rate (limited by the power FET).
by excessive wind speed or 12V battery being fully
charged) then a fixed load is connected thus limiting
the generator RPM to prevent damage.
8
7
6
5
0.1µF
0.1µF
+
13.8V TO 15.1V
10M
WINDOW
WITHIN
0.1µF
OVER VOLTAGE
(>15.1V)
+
MTP8N05
1N4001
12V
LEAD ACID
LTC1042
LTC1042 • A105
MTP8N05
36Ω
5W
1042fa
7