41040 DC/DC converter | Low voltage power conversion | Eaton Overview

Designed to provide 48V to 12V power conversion for heavy-duty applications, the 41040 DC/DC converter offers reliable system performance and flexibility. The converter uses two buck power stages in parallel. The multiphase buck converter architecture uses interleaved timing to multiply power stage ripple frequency and reduce input and output ripple currents. It provides a fixed output to power 12V loads directly from a 56V or 48V source.

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RELIABLE PERFORMANCE

Sealed from the elements with overload and short circuit protection

COMMERCIAL VEHICLE DESIGN

Robust engineering for heavy-duty applications

SYSTEM FLEXIBILITY

Accepts wide input voltage range and multiple output voltages

Core features

Wide input voltage range
Under and over voltage protection
Reverse voltage protection
Voltage transient protection
Overload and short circuit protection
Thermal overload protection
Sealed from the elements
Converter enable signal
CAN communication (isolated CAN optional)
Field configurable parallel mode

Applications

On-highway class 8 trucks
Construction
Agriculture
Golf carts
Electric utility vehicles

Protection features

Feature	Description
Reverse input polarity protection	Reversal of the input polarity is protected with a MOSFET in series with the input
Immunity to single point of failure	Back to back input MOSFETs decouple the load in case of buck MOSFET failure
Parallel mode	Enabled via CAN, the parallel mode feature will reduce the output voltage when there is an increased load demand to improve current sharing between the parallel converters
Under/over voltage protection	Input under-voltage and over-voltage conditions cause the unit to safely turn off
Current limiting protection	Current limiting protection is provided by monitoring the buck MOSFET current -- a small overload will cause the protection circuit to limit the input power by dropping the output voltage out of regulation
Overload protection	f there is a severe overload or short circuit and the output voltage drops below 5V, the converter will go into hiccup mode to protect itself
Thermal protection	Thermal protection is provided by monitoring the unit PCB temperature -- protection circuit will derate the unit’s output to keep the heatsink temperature below 100C
Output back feeding protection	Converter continuously monitors input and output voltage and can decouple Input and output when a back feeding condition is detected

Specifications

Electrical characteristics

Characteristic	MIN	TYP	MAX	Unit	Notes
Input under voltage turn on		11.75	12	V
Input under voltage hysteresis		2		V
Input over voltage turn off	75	75.5	76	V	Voltage on input that causes the unit to turn off
Input over voltage hysteresis		2		V
Quiescent current enable off (converter)			2	mA	Current draw from the input with enable off. vin = 48v
Quiescent current enable on (enable pin)		1		mA	Current draw from the enable pin when applying 48v to that pin at 25c
Quiescent current enable on (vin pin)		30		mA	Current draw from the input with no load attached to output. vin = 48v
Enable turn on voltage	4.4	4.9	5.4	V	Unit will turn on when input voltage is within a valid range and enable voltage is >4.4v
Enable turn off voltage		4.4		V	Unit will turn off if enable voltage drops below 4.4v
Output quiescent current		2		mA	Current draw from output when the voltage applied to the terminals is below 16v
Output voltage (no load)	13.6	13.8	14	V	When 75>vin>16v
Output voltage	Vin-3V	Vin-2.5V		V	When 16>vin>10v
Output voltage (full load)	13.46		14.14	V
Output voltage (full load - parallel mode enabled)	12.65		13.05	V	Output voltage when parallel mode is enabled
Line regulation			0.5	%	Vin>=16v
Output current limit	42	45	47	A	Vin>=44v
Maximum output current	50		60	A	If exceeded, converter will go into hiccup mode. unit will attempt to restart every 500ms and it will latch off after 3 retries
Ripple voltage			0.5	V pk-pk
Maximum input current		13		A	If vin<44v the converter will lower the maximum input power to protect the input connector.
Efficiency	90		94	%	With vin>=48v, 25c 20%-100% load
Over-temp limit		100		°C	Converter will lower its current limit threshold to keep the heatsink temperature below 100°c
Isolation			±333	V	Test between the power terminals and the enclosure/chassis and between 48v power, enable, and ground

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