Owner`s manual

26
Date: 7.5.2012
Version: 1.00
P7000-K Owner’s Manual
TRAIL CHARGER WITH LOCKOUTS THEORY OF OPERATION
The 11020CL0 is a specially designed DC/DC converter that is used to charge a battery from a 12V source. An example
is a battery that is mounted on the trailer of a vehicle. The distance between the alternator of the vehicle and the
trailer-mounted battery makes it difficult to get adequate charging voltage to the battery. The 11020CL0 has a
microprocessor on-board to measure the input voltage, output voltage and current, boost voltage, temperature
sensors, as well as monitoring the shutdown and reduce commands input to the unit. The lockout feature is provided
via an Intelligent Power Switch on the output, to provide consistent, robust protection and control of the output
current.
The 11020CL0 has four modes of operation:
• Boost Mode: This mode is enabled when input voltage is nominal (e.g.. Vin ≤ (Vout + 0.6 Vdc)). When the converter
is operating in this mode, the output voltage is temperature compensated, see graph 1.
• Bypass Mode: This mode is enabled when the input voltage is greater than the output voltage. In this mode, the
converter will enter a “burst” operation whereby the output will burst on and off when the pass through current
exceeds 20ADC. If the Reduce command is active, then the unit will burst if the pass through current exceeds 10ADC.
• Reduced Power Mode: This mode is enabled when the REDUCE or R¯E¯¯D¯U¯C¯¯E pin, is active (e.g. REDUCE ≥ 3Vdc
or R¯E¯¯D¯U¯C¯¯E ≤ 3Vdc). In this mode the output is current limited to approximately 12A. Reduced power mode is
effective during nominal Boost Mode operation and while in Bypass mode. In bypass, bursting will allow up to ~11A
RMS in reduce mode and up to ~22A RMS without the reduce command.
• Shutdown Mode: This mode is enabled when the SD pin is active (e.g. SD ≥ 3V). In this mode the charger output is
shutdown and will not charge an external battery. This mode has the highest priority and over-rides all other modes.
The microprocessor measures the temperature of the converter and provides a temperature compensated output,
optimized for recharging AGM batteries. This is most effective when the charger and battery are at the same
temperature (mounted in near proximity).
Monitoring the internal temperature provides thermal protection. When the microprocessor detects extreme
temperatures, action is taken to protect the unit, including shutdown of output.
The converter is designed to withstand the severe electrical environment of heavy-duty trucks and off highway
equipment. The converter can withstand load dump, reverse battery, short circuit, and over-temperature conditions
without sustaining damage.
The unit is adequately sealed to meet the performance standards called out in SAE J1455 Section 4 specification
relative to Humidity, Salt Spray, Splash and Dust bombardment.
1.