HBA48T12280 Power-One, HBA48T12280 Datasheet - Page 7

• Manufacturer Part Number: HBA48T12280
• Description: Hba48t12280 Dc-dc Converter 36-75 Vdc Input; 28 Vdc @ 12.5 A Output
• Manufacturer: Power-One

Output Voltage Adjust / TRIM
The output voltage can be adjusted up 18% or down
25% relative to the rated output voltage by the
addition of an externally connected resistor. Trim up
to 18% at full load is guaranteed at Vin ≥ 36V.
To increase the output voltage, refer to
trim resistor, R
the TRIM and SENSE(+), with a value of:
where,
When trimming up, care must be taken not to exceed
the converter‘s maximum allowable output power.
See the previous section for a complete discussion
of this requirement.
BCD.00009.1 Rev. AA, 20-Oct-09
VIN
R
T

Figure D: Configuration for increasing output voltage.
INCR
Δ


V
R
V
V
O-REQ
O-NOM
T-INCR
(V
O
O

NOM
-
REQ
1.225Δ
= Desired (trimmed) output voltage [V].
V
= Required value of trim-up resistor [kΩ]
= Nominal value of output voltage [V]
T-INCR
O
(100

-
NOM
ON/OFF
VIN (+)
VIN (-)
CASE
V
O
, should be connected between
-
NOM

Δ)
(Top View)
)
X

100
(100
SENSE (+)
SENSE (-)
VOUT (+)
VOUT (-)
TRIM
Δ

2
Δ)
R
T-INCR
Figure D
[%]
[kΩ]
HBA48T12280 DC-DC Converter Data Sheet
36-75 VDC Input; 28 VDC @ 12.5 A Output
, a
Rload
Page 7 of 14
To decrease the output voltage (
resistor, R
TRIM and SENSE(
where,
Note:
The above equations for calculation of trim resistor values match
those typically used in conventional industry-standard models.
Trimming/sensing beyond 118% of the rated output
voltage is not an acceptable design practice, as this
condition could cause unwanted triggering of the
output overvoltage protection (OVP) circuit. The
designer should ensure that the difference between
the voltages across the converter’s output pins and
its
VOUT(nom), or:
This equation is applicable for any condition of
output sensing and/or output trim.
The output voltage can also be trimmed by applying
an external control voltage source, V
the input of the trim pin using the following equation
(refer to
Where ΔV
negative value, the negative sign should be included
in the V
VIN
[V
OUT
Figure E: Configuration for decreasing output voltage.
·
(+) – V
sense
R
[kΩ]
and
TRIM
Figure F
R
T-DECR
OUT
V
T
O
T-DECR

DECR
TRIM

(-)] – [V
= (V
equation. All limitations associated with
pins
is defined above.

= Required value of trim-down resistor
for connections):
=1.225+ (0.0.088•ΔV
, should be connected between the
REQ’D
100
|
ON/OFF
SENSE
VIN (+)
VIN (-)
CASE
| Δ
–
), with a value of:
does
(+) – V
– V

(Top View)
2
NOM
SENSE
not
); if ΔV
(-)] < V
SENSE (+)
SENSE (-)
VOUT (+)
VOUT (-)
TRIM
exceed
www.power-one.com
O–NOM
Figure E
O
O
TRIM
)
calculates to a
X 10%
[kΩ]
R
, directly to
T-DECR
105%
), a trim
[V]
Rload
of