lsm-1.8/16-w3 C&D Technologies., lsm-1.8/16-w3 Datasheet - Page 6

• Manufacturer Part Number: lsm-1.8/16-w3
• Description: Non-isolated, Wide Input Smt Dc/dc Converters
• Manufacturer: C&D Technologies.

Note: Resistor values are in kΩ. Accuracy of adjustment is subject to toler-
ances of resistors and factory-adjusted, initial output accuracy. V
output voltage. V
o nom
Figure 7. Trim Connections Using Fixed Resistors
Figure 6. Trim Connections Using a Trimpot
= nominal output voltage.
Trim Equations
www.murata-ps.com
Note: Install either a fixed
trim-up resistor or a fixed
trim-down resistor depending
upon desired output voltage.
o
= desired
“T” Model (LSM-T/16-W3)
This version of the LSM-W3 series offers a special output voltage trimming
feature which is fully compatible with competitive units. The output voltage
may be varied using a single trim resistor from the Trim input (pin 5) to Power
Common (pin 3). The output voltage range is 0.75 Volts to 3.3 Volts.
IMPORTANT: For outputs greater than 3 Volts up to 3.3 Volts maximum, the
input supply must be 4.5 Volts minimum.
As with other trim adjustments, be sure to use a precision low-tempco resistor
(±100 ppm/°C) mounted close to the converter with short leads. Also be aware
that the output voltage accuracy is ±2% (typical) therefore you may need to
vary this resistance slightly to achieve your desired output setting.
The trim equation is as follows for the LSM-T/16-W3:
LSM-T/16-W3 fixed resistance values to set the output voltages are:
CAUTION: To retain proper regulation, do not exceed the 3.3V output.
Voltage Trim
The LSM-T/16-W3 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 the Trim pin is approximately 5kΩ. Therefore, you may
have to compensate for this in the source resistance of your external voltage
reference.
The equation for this voltage adjustment is:
The LSM-T/16-W3 fixed trim voltages to set the output voltage are:
V
V
R
OUT
OUT
TRIM
V
TRIM
(Typ.)
(Typ.)
(kΩ)
Non-Isolated, Wide Input SMT DC/DC Converters
V
TRIM
0.75V
Open
R
0.75V
Open
TRIM
(in Volts) = 0.7 –(0.1698 x (V
Technical enquiries email: [e-mail], tel:
(Ω) = _____________ –5110
0.6928V 0.624V 0.5731V 0.5221V 0.4033V 0.267V
80.021
1.0V
1.0V
LSM-16A W3 Models
V
O
41.973
1.2V
– 0.7525
1.2V
21070
23.077
1.5V
1.5V
MDC_LSM-16A_W3.A03 Page 6 of 12
O
– 0.7525))
15.004
1.8V
1.8V
6.947
2.5V
2.5V
[phone]
3.3V
3.16
3.3V