DTL23A データシートの表示（PDF） - Murata Manufacturing
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DTL23A Datasheet PDF : 5 Pages
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7!44 6/,4!'%#/.42/,,%$ %,%#42/.)# ,/!$
4%#(.)#!, ./4%3
/UTPUT #OMPLIANCE 6OLTAGE AND THE &AULT ,INE
&OR PROPER OPERATION THE $4,!gS OUTPUTLOAD VOLTAGE MUST ALWAYS BE BETWEEN
AND 6OLTS 4HE DEVICE CANNOT BE USED TO DIRECTLY LOAD EXTREMELY
LOW VOLTAGE SUCH AS 6 OR 6 POWER COMPONENTS OR TO SIMULATE A TRUE
SHORT CIRCUIT 6OLTS 6OLTAGES GREATER THAN 6 CAN DAMAGE THE DEVICE
6OLTAGES 6 WILL RESULT IN INSUFlCIENT BIASING OF THE OUTPUT CURRENT SOURCE AND
CONSEQUENTLY UNPREDICTABLE OR NO OPERATION !CCORDINGLY WE HAVE INSTALLED AN
INTERNAL OUTPUTLOADVOLTAGE MONITORING CIRCUIT )F THE OUTPUTLOAD VOLTAGE DROPS
BELOW 6 AND THE $4,!gS OUTPUT IS AT RISK OF BECOMING DISABLED THE &AULT
LINE ACTIVATES
4HE &AULT LINE IS AN ACTIVELOW FUNCTION WITH AN OPENCOLLECTOR OUTPUT INTERNAL
K7 PULLUP RESISTOR TO 6 5NDER NORMAL CONDITIONS ITS OUTPUT IS HIGH
LOGIC 5NDER FAULT CONDITIONS 6OUT 6 ITS OUTPUT DROPS TO A LOGIC
4HERE IS NO OUTPUTLOADVOLTAGE MONITORING CIRCUIT FOR VOLTAGES GREATER THAN
6 AND OPERATION ABOVE 6 CAN DAMAGE THE DEVICE
!N OFFSET SUPPLY CAN BE INSERTED BETWEEN THE $4,!gS ,OAD OUTPUT PINS
AND AND THE POWER DEVICE UNDER TEST $54 TO TRANSLATE THE $4,!gS
6 OUTPUTLOAD VOLTAGE RANGE 4HE OFFSET SUPPLY MUST HAVE ADEQUATE CURRENT
CAPABILITIES AND BE CONNECTED WITH THE POLARITIES INDICATED IN &IGURE BELOW
5NDER NO CIRCUMSTANCES SHOULD THE VOLTAGE ACROSS THE $4,!gS OUTPUT BE
ALLOWED TO EXPERIENCE A POLARITY REVERSAL
)F A 6! OFFSET SUPPLY IS INSERTED AS SHOWN THE RANGE OF $54 VOLTAGES WILL
BE TO 6OLTS 3UCH A CONlGURATION CAN BE USED FOR TRUE SHORTCIRCUIT
TESTING ! MECHANICAL RELAY CAN BE USED TO SHORT THE OUTPUTS OF THE $54 WHILE
THE OFFSET SUPPLY ENSURES THE $4,! ALWAYS SEES AT LEAST 6OLTS ACROSS ITS
OUTPUTS
4HERMAL #ONSIDERATIONS
4HE $4,! CAN RELIABLY HANDLE 7 LOADS IF ITS ALUMINUM BASEPLATE
TEMPERATURE IS MAINTAINED AT OR BELOW ª# 7ITH NO HEAT SINKING OR
AUXILIARY COOLING THE DEVICE CAN ONLY HANDLE LOADS UP TO 7ATTS 0LEASE
REFER TO THE 4EMPERATURE $ERATING #URVE FOR ADDITIONAL INFORMATION $ATELgS
%LECTRONIC ,OAD !PPLICATIONS %NGINEERS CAN ASSIST YOU IN DEVELOPING HEAT
SINK SOLUTIONS FOR YOUR HIGHERPOWER $4,! APPLICATIONS 0LEASE CONTACT
US FOR DETAILS AND CONCERNING OUR $4,(3$ HEAT SINK
#ONSTANT 2ESISTANCE !PPLICATION
4HE $4,! OPERATES AS A CONSTANT CURRENT ELECTRONIC LOAD IN ITS TYPICAL
CONlGURATION ! CONSTANT RESISTANCE MODE OF OPERATION CAN BE ACHIEVED
AS FOLLOWS
4HE $4,! HAS A HIGH IMPEDANCE ISOLATED ANALOG INPUT THAT ALLOWS THE
ANALOG INPUTS TO BE CONNECTED DIRECTLY ACROSS THE LOAD 4HE $4,! SINKS
AMPS FOR A 6 FULL SCALE INPUT OR ) X 6). )F YOU MAKE 6). 6,/!$
THE VOLTAGE ACROSS THE LOAD THEN 2 6,/!$) 6,/!$ X 6,/!$
/HMS #ONSEQUENTLY THE LOAD LOOKS LIKE A /HM RESISTOR
&URTHERMORE IF YOU MAKE 6). K X 6,/!$ BY CONNECTING A POTENTIOMETER OR
RESISTIVE DIVIDER ACROSS THE LOAD THEN 2 6,/!$ X K X 6,/!$ K SO
ADJUSTING THE POTENTIOMETER WILL GIVE YOU AN ADJUSTABLE POWER RESISTOR EG AT
+ THEN 2 /HM K THEN 2 /HMS ETC 4HE ONLY LIMITATION
THAT YOU MUST OBSERVE IS THE MAXIMUM LOAD VOLTAGE 6 AND WATT
POWER DISSIPATION ! MULTIPLYING DIGITALTOANALOG CONVERTER OR A DIGITAL
POTENTIOMETER COULD BE UTILIZED TO MAKE A PROGRAMMABLE RESISTANCE
&IGURE !N OFFSET 3UPPLY %NABLES
4RUE 3HORT#IRCUIT 4ESTING
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
www.murata-ps.com/support
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2012 Murata Power Solutions, Inc.
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