LSM-16A C&D Technologies., LSM-16A Datasheet - Page 6

• Manufacturer Part Number: LSM-16A
• Description: Non-isolated, 13-80w Smt Dc/dc Converters
• Manufacturer: C&D Technologies.

values. Recall, untrimmed devices are guaranteed to be ±1.25% accurate.
mended. When using trim in combination with Remote Sense, the maximum
rated power must not be exceeded (see Remote Sense).
The equations below can be starting points for selecting specific trim-resistor
Adjustment beyond the specified ±10% adjustment range is not recom-
R
to tolerances of resistors and factory-adjusted, initial output accuracy.
T
Note: Resistor values are in kΩ. Accuracy of adjustment is subject
DOWN
V
o
(k ) =
= desired output voltage. V
+INPUT
COMMON
Figure 7. Trim Connections Using Fixed Resistors
Where: V
7.87(V
V
O NOM
LSM-0.75/16-D12:
LSM-1/16-D12:
LSM-1.2/16-D12:
LSM-1.5/16-D12:
LSM-1.8/16-D12:
LSM-2/16-D12:
LSM-2.5/16-D12:
LSM-3.3/16-D12:
LSM-5/16-D12:
O
V
– 0.7)
– V
O
O NOM
= Desired Output Voltage
O
Trim Equations
+OUTPUT
COMMON
= Nominal Output Voltage
– X
TRIM
Note: Install either a fixed trim-up resistor
or a fixed trim-down resistor depending
upon desire output voltage.
o nom
= nominal output voltage.
R
X = 0.909
X = 11.5
X = 19.1
X = 27.4
X = 16.9
X = 21.5
X = 18.2
X = 13.7
X = 9.09
T
UP
(k ) =
www.murata-ps.com
Trim
Down
Trim
Up
V
O
LOAD
5.509
– V
O NOM
– X
“T” Model LSM-T/16-D12
This version of the LSM 16A series offers a special output voltage trimming
feature which is fully compatible with competitive units. The output voltage
may be varied from 0.75 to 5 Volts using a single external trim-up resistor con-
nected from the Trim input to Output Common. If no trim resistor is attached
(Trim pin open), the output is 0.7525 Volts.
nected to the Trim input.
low temperature coefficient (±100 ppm/°C or less) mounted close to the con-
verter with short leads. Also be aware that the output accuracy is ±2% (typical)
therefore you may need to vary this resistance slightly to achieve your desired
output setting.
Voltage Trim
The LSM-T/16-D12 may also be trimmed using an external voltage applied
between the Trim Input and Output Common. Be aware that the internal “load”
impedance looking into trim pin is approximately 5kΩ. Therefore, you may
have to compensate for this in the source resistance of your external voltage
reference.
R
V
t
t
The trim may also be adjusted using an external reference voltage con-
As with other trim adjustments, use a 1% metal film precision resistor with
The resistor trim up equation for the LSM-T/16-D12 is as follows:
Where V
The LSM-T/16-D12 fixed resistance values to set the output values are:
CAUTION: To retain proper regulation, do not exceed the 5 Volt output.
The equation for this voltage adjustment is:
The LSM-T/16-D12 fixed trim voltages to set the output voltage are:
V
V
(kΩ)
o
(V)
o
R
T
UP
0.7525V
0.7525V
Open
( ) =
o
V
Open
TRIM
is the desired output voltage.
Non-Isolated, 13-80W SMT DC/DC Converters
= 0.7 – (0.0667 × (V
0.6835 0.670
V
Technical enquiries email: [e-mail], tel:
41.424 22.46 13.05 9.024 5.009 3.122 1.472
1.0V
O
1.0V
10500
– 0.7525
LSM-16A D12 Models
1.2V
1.2V
– 1000
O
0.650
1.5V
1.5V
– 0.7525))
MDC_LSM 16A D12 Models.A03 Page 6 of 12
0.630
1.8V
1.8V
0.583
2.5V
2.5V
0.530 0.4166
3.3V
[phone]
3.3V
5.0V
5.0V