Datasheet
UWE Series
Wide Input, Isolated
Eighth-Brick DC-DC Converters
MDC_UWE Series.E04 Page 22 of 23
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UWE series converters will compensate for drops between the output volt-
age at the DC-DC and the sense voltage at the DC-DC provided that:
[V
OUT(+) –VOUT(–)] –[Sense(+) –Sense (–)] 5% VOUT
Output overvoltage protection is monitored at the output voltage pin, not
the Sense pin. Therefore, excessive voltage differences between V
OUT and
Sense in conjunction with trim adjustment of the output voltage can cause the
overvoltage protection circuitry to activate (see Performance Specifi cations
for overvoltage limits). Power derating is based on maximum output current
and voltage at the converter’s output pins. Use of trim and sense functions can
cause output voltages to increase thereby increasing output power beyond the
UWE’s specifi ed rating or cause output voltages to climb into the output over-
voltage region. Also, the use of Trim Up and Sense combined may not exceed
+10% of V
OUT. Therefore, the designer must ensure:
(V
OUT at pins) x (IOUT) rated output power
UP
VO – 3.3
R
T (k ) =
–10.2
13.3(VO – 1.226)
3.3 – V
O
RT (k ) =
–10.2
16.31
DOWN
3.3 Volt Output
UP
VO – 5
R
T (k ) =
–10.2
20.4(VO – 1.226)
5 – V
O
RT (k ) =
–10.2
25.01
DOWN
5 Volt Output
UP
VO – 12
R
T (k ) =
–10.2
49.6(VO – 1.226)
UP
VO – 15
R
T (k ) =
–10.2
62.9(VO – 1.226)
12 – V
O
RT (k ) =
–10.2
60.45
DOWN
15 – VO
RT (k ) =
–10.2
76.56
DOWN
12 Volt Output
15 Volt Output
UP
VO – 24
R
T (k ) =
–10.2
101(VO – 1.226)
24 – V
O
RT (k ) =
–10.2
124.2
DOWN
24 Volt Output
Trim Equations
Trim Up Trim Down
LOAD
+VOUT
+VIN
Sense Current
Contact and PCB resistance
losses due to IR drops
Contact and PCB resistance
losses due to IR drops
Sense Return
–VIN
ON/OFF
CONTROL
TRIM
+SENSE
–VOUT
–SENSE
I
OUT Return
I
OUT
Figure 9. Remote Sense Circuit Confi guration