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GAQ40S3V3B
DC-DC Converter Technical Manual V1.4
Remote On/Off
Logic
On/Off Pin Level
Enable
Negative
Low level
logic
High level or left
open
On/Off
V
(–)
in
Simple control
On/Off
V
(–)
in
Isolation control
Figure 15: various circuits for driving the On/Off pin
Remote Sense
This function is used to compensate for voltage
drops on R
. The Sense(+), Sense(–), V
w
V
(–) terminals should meet the following
out
requirements:
(+) – V
(–)] – [Sense(+) – Sense(–)] ≤ 10% x V
[V
out
out
(V
is the rated output voltage.)
nom
V
(+)
out
V
(+)
in
Sense(+)
On/Off
Trim
Sense(–)
V
(–)
in
V
(–)
out
Figure 16: Configuration diagram for remote sense
R
indicates the line impedance between the output terminal
w
and the load.
If the remote sense function is disabled, the
Sense(+) terminal directly connects to the V
terminal and the Sense(–) terminal directly
connects to the V
(–) terminal.
out
GLOBAL ENERGY EFFICIENCY SPECIALIST
Status
On
Off
On/Off
V
(–)
in
Transistor control
VCC
TTL/
On/Off
COMS
V
(–)
in
Direct logic drive
(+), and
out
nom
R
w
Load
R
w
(+)
out
Output Voltage Trim
The output voltage can be adjusted according to
the trim range specification by using the Trim pin.
Trim Up
The output voltage can be increased by installing
an external resistor between the Trim pin and the
Sense(+) pin.
V
(+)
out
V
(+)
in
Sense(+)
On/Off
Trim
Sense(–)
V
(–)
in
V
(–)
out
Figure 17: Configuration diagram for Trim up
The relationship between R
5
1 .
V
(
100
nom
R
adj
up
. 1
225
V
V
trim
up
nom
100
V
nom
1.
If the Trim pin is not used, it should be left open.
2.
Ensure that the actual output power does not exceed
the maximum output power when raising the voltage.
Trim Down
The output voltage can be decreased by installing
an external resistor between the Trim pin and the
Sense(–) pin.
V
(+)
out
V
(+)
in
Sense(+)
On/Off
Trim
Sense(–)
V
(–)
in
V
(–)
out
Figure 18: Configuration diagram for Trim down
The relationship between R
510
R
10
.
( 2
kohm
adj
down
8
R
adj-up
Load
and V
:
adj-up
out
)
510
10
.
( 2
kohm
)
Load
R
adj-down
and V
:
adj-down
out
V
V
nom
trim
down
)
V
nom
100
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