JBW030F Datasheet, PDF (9/16 Pages) Lineage Power Corporation – 36-75 Vdc Input; 3.3 Vdc and 5 Vdc Outputs; 30 W

Data Sheet
March 27, 2008
JBW030-Series Power Module: dc-dc Converters
36-75 Vdc Input; 3.3 Vdc and 5 Vdc Outputs; 30 W
Feature Descriptions (continued)
Remote On/Off (continued)
–
Von/off
+
Ion/off
VI(+)
VI(-)
REMOTE
ON/OFF
SENSE(+)
VO(+)
VO(–)
SENSE(–)
LOAD
8-720(C).h
Figure 14. Remote On/Off Implementation
Remote Sense
Remote sense minimizes the effects of distribution
losses by regulating the voltage at the remote-sense
connections. The voltage between the remote-sense
pins and the output terminals must not exceed the out-
put voltage sense range given in the Feature Specifica-
tions table, i.e.:
[VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ≤ 0.2 V
The voltage between the VO(+) and VO(–) terminals
must not exceed the minimum output overvoltage shut-
down voltage as indicated in the Feature Specifications
table. This limit includes any increase in voltage due to
remote-sense compensation and output voltage set-
point adjustment (trim). See Figure 15.
If not using the remote-sense feature to regulate the
output at the point of load, then connect SENSE(+) to
VO(+) and SENSE(–) to VO(–) at the module.
SENSE(+)
SENSE(–)
SUPPLY _II
CONTACT
RESISTANCE
VI(+)
VI(-)
VO(+)
VO(–)
IO
LOAD
CONTACT AND
DISTRIBUTION LOSSES
8-651(C).m
Figure 15. Effective Circuit Configuration for
Single-Module Remote-Sense Operation
Output Voltage Set-Point Adjustment
(Trim)
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 SENSE(+) or
SENSE(–) pins. With an external resistor between the
TRIM and SENSE(–) pins (Radj-down), the output voltage
set point (VO, adj) decreases (see Figure 16). The fol-
lowing equation determines the required external-resis-
tor value to obtain an output voltage change of % Δ.
R adj-down
=
⎛
⎝
1-----%–_{-----%-Δ-----}Δ_{-- ⎠⎞}
10
kΩ
For example, to lower the output voltage by 20%, the
external resistor value must be:
R adj-down
=
⎛
⎝
1-----0–_{----.-02---.--2--⎠⎞}
10
kΩ
=
40.00
kΩ
With an external resistor connected between the TRIM
and SENSE(+) pins (Radj-up), the output voltage set
point (VO, adj) increases (see Figure 17). The following
equations determine the required external-resistor
value to obtain an output voltage change of % Δ.
JBW030A:
R adj-up
=
⎛
⎝
-V----^O---^, --ⁿ---^o--^m--
2.5
–
1_⎠⎞
⎛
⎝
1-----%+-----%-_Δ-----Δ_{--⎠⎞}
10
kΩ
For example, to increase the output voltage of the
JBW030A by 5%, the external resistor value must be:
R adj-up
=
⎛
⎝
5----.--0-
2.5
–
1_⎠⎞
⎛
⎝
1-----+0----.-00----.5-0----5- _⎠⎞
10
kΩ
=
210 kΩ
JBW030F:
R adj-up
=
⎛
⎝
V-----O_---,_--n_---o_---m_---
1.235
–
1_⎠⎞
⎛
⎝
1-----+%-----%-_Δ-----Δ_{--⎠⎞}
10
kΩ
For example, to increase the output voltage of the
JBW030F by 5%, the external resistor must be:
R adj-up
=
⎛
⎝
----3---.--3-----
1.235
–
1_⎠⎞
⎝⎛ ^{1-----+0----.-00----.5-0----5-} ⎠⎞
10
kΩ
= 351.1
kΩ
Lineage Power
9