LW025F871 Lineage Power, LW025F871 Datasheet - Page 9

• Manufacturer Part Number: LW025F871
• Description: CONVERTER DC/DC 3.3V 16.5W OUT
• Manufacturer: Lineage Power
• Series: LW025r
• Type: Isolated with Remote On/Offr

Specifications of LW025F871

• Output: 3.3V
• Number Of Outputs: 1
• Power (watts): 25W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 8-DIP Module
• 1st Output: 3.3 VDC @ 5A
• Size / Dimension: 2.00" L x 2.00" W x 0.39" H (50.8mm x 50.8mm x 9.9mm)
• Power (watts) - Rated: 16.5W
• Operating Temperature: -40°C ~ 110°C
• Efficiency: 77%
• Approvals: CE, CSA, UL, VDE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -

April 2008
Lineage Power
Feature Descriptions
Remote On/Off
Output Voltage Adjustment
Output voltage trim allows the user to increase or decrease the output voltage set point of a module. This is
accomplished by connecting an external resistor between the TRIM pin and either the V
external resistor between the TRIM and V
an external resistor between the TRIM pin and V
The following equations determine the required external resistor value to obtain an output voltage change of ý%:
The adjusted output voltage cannot exceed 110% of the nominal output voltage between the V
minal.
The modules have a fixed current-limit set point. Therefore, as the output voltage is adjusted down, the available
output power is reduced. In addition, the minimum output current is a function of the output voltage. As the output
voltage is adjusted down, the minimum required output current can increase.
Output Overvoltage Protection
The output overvoltage clamp consists of control circuitry, independent of the primary regulation loop, that monitors
the voltage on the output terminals. The control loop of the protection circuit has a higher voltage set point than the
primary loop (see Feature Specifications table). In a fault condition, the overvoltage clamp ensures that the output
voltage does not exceed V
overvoltage.
LW025A
LW025F
Device
R
R
adj-down
adj-up
=
=
---------------- - b
d Δ
⋅ %
c d
------------------------------------------------ b
a
[
14.0
4.02
(continued)
a
⋅
(
–
1 Δ%
Δ%
–
O, clamp, max
kΩ
(continued)
51.1
16.9
) 1
b
–
Figure 13. Remote On/Off Implementation
]
–
. This provides a redundant voltage-control that reduces the risk of output
kΩ
O
2.01
5.2
(+) pins (R
c
O
V
I
(–) pin (R
on/off
on/off
+
-
adj-down
2.7
2.0
d
V
V
REMOTE
ON/OFF
I
I
(+)
(-)
adj-up
), the output voltage set point (V
), V
–5% V
O, adj
111.7 k¾
19.3 k¾
increases.
O
R
36 Vdc to 75 Vdc Inputs; 25 W
adj-down
O
(+) or V
O, adj
+5% V
O
(+) and V
O
) decreases. With
(–) pins. With an
52.7 k¾
23.3 k¾
O
R
adj-up
O
(–) ter-
8-758(C).a
9