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| LSM16A-W3 Datasheet, PDF (6/12 Pages) Murata Manufacturing Co., Ltd. – Non-Isolated, Wide Input SMT DC/DC Converters | |||
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LSM-16A W3 Models
Non-Isolated, Wide Input SMT DC/DC Converters
).054
#/--/.
/54054
42)-
#/--/.
K7
4URNS
,/!$
Figure 6. Trim Connections Using a Trimpot
).054
#/--/.
/54054
42)-
#/--/.
4RIM
$OWN
,/!$
4RIM
5P
Note: Install either a ï¬xed
trim-up resistor or a ï¬xed
trim-down resistor depending
upon desired output voltage.
Figure 7. Trim Connections Using Fixed Resistors
4RIM $OWN
.O 4RIM $OWN
Trim Equations
,3-
7
4RIM 5P
2450 K7 6/ n n
,3-
7
24$/7. K7
6/ n
n 6/
n
2450 K7 6/ n n
,3-
7
24$/7. K7
6/ n
n 6/
n
2450 K7
n
6/ n
,3-
7
24$/7. K7
6/ n
n 6/
n
2450 K7
n
6/ n
,3-
7
6/ n
24$/7. K7
n 6/
n
2450 K7
n
6/ n
,3-
7
6/ n
24$/7. K7 n 6/
n
2450 K7
n
6/ n
,3-
7
6/ n
24$/7. K7 n 6/
n
2450 K7
n
6/ n
,3-
7
6/ n
24$/7. K7 n 6/
n
2450 K7 6/ n n
âTâ 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:
RTRIM (7) = _____2_1_0_7_0____ â5110
VO â 0.7525
LSM-T/16-W3 ï¬xed resistance values to set the output voltages are:
VOUT (Typ.) 0.75V 1.0V 1.2V 1.5V 1.8V 2.5V 3.3V
RTRIM (k7) Open 80.021 41.973 23.077 15.004 6.947 3.16
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 âloadâ
impedance looking into the Trim pin is approximately 5k7. Therefore, you may
have to compensate for this in the source resistance of your external voltage
reference.
The equation for this voltage adjustment is:
VTRIM (in Volts) = 0.7 â(0.1698 x (VO â 0.7525))
The LSM-T/16-W3 ï¬xed trim voltages to set the output voltage are:
VOUT (Typ.) 0.75V 1.0V 1.2V 1.5V 1.8V 2.5V 3.3V
VTRIM Open 0.6928V 0.624V 0.5731V 0.5221V 0.4033V 0.267V
Note: Resistor values are in k7. Accuracy of adjustment is subject to toler-
ances of resistors and factory-adjusted, initial output accuracy. VO = desired
output voltage. VONOM = nominal output voltage.
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_LSM-16A_W3.A04 Page 6 of 12
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