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| USQ20 Datasheet, PDF (9/22 Pages) Murata Manufacturing Co., Ltd. – High-Density, Quarter-Brick 20 Amp, DC/DC Converters | |||
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! 3).',% /54054 $#$# #/.6%24%23
1-+Ã Â`iÂÃ
.EGATIVE
4RIM 5NITS $ 3UFlX
3TANDARD 531gS HAVE A POSITIVE
TRIM FUNCTION CONSISTENT WITH THE INDUSTRY
STANDARD FOOTPRINTS AND FUNCTIONALITY $!4%, ALSO OFFERS NEGATIVE
TRIM 531gS
DESIGNATED WITH A $ SUFlX TO THE PART NUMBER 4HE NEGATIVE
TRIM DEVICES
TRIM UP WITH A SINGLE RESISTOR TIED FROM THE /UTPUT 4RIM PIN TO THE n3ENSE
PIN TO INCREASE THE OUTPUT VOLTAGE ! RESISTOR CONNECTED FROM THE /UTPUT
4RIM PIN TO THE 3ENSE PIN WILL DECREASE THE OUPUT VOLTAGE
4HE NEGATIVE
TRIM FORMULA VALUES FOR 531 6OLT DEVICES WITH A
6OLT INPUT AND NEGATIVE LOGIC READS
2 4 2 ) - ! n $"6X $6
-ODEL
4RIM 5P 4RIM $OWN
!
"
!
"
531
$.$
531
$.$
531
$.$
WHERE $6 IS THE ABSOLUTE VALUE OF THE OUTPUT VOLTAGE CHANGE DESIRED
&LOATING /UTPUTS
3INCE THESE ARE ISOLATED $#$# CONVERTERS THEIR OUTPUTS ARE mOATING WITH
RESPECT TO THEIR INPUT $ESIGNERS WILL NORMALLY USE THE n/UTPUT PIN AS THE
GROUNDRETURN OF THE LOAD CIRCUIT 9OU CAN HOWEVER USE THE /UTPUT PIN AS
GROUNDRETURN TO EFFECTIVELY REVERSE THE OUTPUT POLARITY
2EMOTE 3ENSE
.OTE 4HE 3ENSE AND 6/54 LINES ARE NOT INTERNALLY CONNECTED TO EACH OTHER
4HEREFORE IF THE SENSE FUNCTION IS NOT USED FOR REMOTE REGULATION THE USER
MUST CONNECT THE 3ENSE TO 6/54 AND n3ENSE TO n6/54 AT THE $#$#
CONVERTER PINS
531 SERIES CONVERTERS EMPLOY A SENSE FEATURE TO PROVIDE POINT
OF
USE REGU
LATION THEREBY OVERCOMING MODERATE )2 DROPS IN PCB CONDUCTORS OR CABLING
4HE REMOTE SENSE LINES CARRY VERY LITTLE CURRENT AND THEREFORE REQUIRE A MINI
MAL CROSS
SECTIONAL AREA CONDUCTOR 4HE SENSE LINES WHICH ARE CAPACITIVELY
COUPLED TO THEIR RESPECTIVE OUTPUT LINES ARE USED BY THE FEEDBACK CONTROL
LOOP
TO REGULATE THE OUTPUT !S SUCH THEY ARE NOT LOW IMPEDANCE POINTS AND MUST
BE TREATED WITH CARE IN LAYOUTS AND CABLING 3ENSE LINES ON A PCB SHOULD BE
RUN ADJACENT TO DC SIGNALS PREFERABLY GROUND )N CABLES AND DISCRETE WIRING
APPLICATIONS TWISTED PAIR OR OTHER TECHNIQUES SHOULD BE IMPLEMENTED
531 $#$# CONVERTERS WILL COMPENSATE FOR DROPS BETWEEN THE OUTPUT
VOLTAGE AT THE $#$# AND THE SENSE VOLTAGE AT THE $#$#
;6/54 n6/54n = n ;3ENSE n3ENSE n = b 6/54
n).054
/./&&
#/.42/,
).054
/54054
#ONTACT AND 0#" RESISTANCE
LOSSES DUE TO )2 DROPS
3%.3%
42)-
n3%.3%
n/54054
)/54
3ENSE #URRENT
3ENSE 2ETURN
)/54 2ETURN
,/!$
#ONTACT AND 0#" RESISTANCE
LOSSES DUE TO )2 DROPS
&IGURE 2EMOTE 3ENSE #IRCUIT #ONlGURATION
/UTPUT OVERVOLTAGE PROTECTION IS MONITORED AT THE OUTPUT VOLTAGE PIN NOT
THE 3ENSE PIN 4HEREFORE EXCESSIVE VOLTAGE DIFFERENCES BETWEEN 6/54 AND
3ENSE IN CONJUNCTION WITH TRIM ADJUSTMENT OF THE OUTPUT VOLTAGE CAN CAUSE
THE OVERVOLTAGE PROTECTION CIRCUITRY TO ACTIVATE SEE 0ERFORMANCE 3PECIlCA
TIONS FOR OVERVOLTAGE LIMITS 0OWER DERATING IS BASED ON MAXIMUM OUTPUT
CURRENT AND VOLTAGE AT THE CONVERTERS OUTPUT PINS 5SE OF TRIM AND SENSE
FUNCTIONS CAN CAUSE OUTPUT VOLTAGES TO INCREASE THEREBY INCREASING OUTPUT
POWER BEYOND THE 531S SPECIlED RATING OR CAUSE OUTPUT VOLTAGES TO CLIMB
INTO THE OUTPUT OVERVOLTAGE REGION 4HEREFORE
6/54 AT PINS s )/54 b RATED OUTPUT POWER
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