LSN16A-D12 Datasheet, PDF (7/13 Pages) Murata Manufacturing Co., Ltd. – Single Output, Non-Isolated, 12VIN, 0.75-5VOUT 16 Amp in DC/DCs SIP Packages

LSN-16A D12 Models
Single Output, Non-Isolated, 12VIN, 0.75-5VOUT
16 Amp in DC/DCs SIP Packages
Trim Equations
RT _UP (kΩ) =
0.349
VO – VO _NOM
–X
LSN-0.75/16-D12: X = 3.09
LSN-0.75/16-D12 cannot be trimed down
RT _DOWN (kΩ) =
2.21(VO – 0.7)
–X
VO _NOM – VO
1.547
RT _UP (kΩ) =
VO – VO _NOM
–X
LSN-1/16-D12: X = 2.67
LSN-1.2/16-D12: X = 4.75
LSN-1.5/16-D12: X = 7.5
7.5(VO – 0.7)
RT _DOWN (kΩ) =
VO _NOM – VO
–X
5.25
RT _UP (kΩ) =
VO – VO _NOM
–X
LSN-1.8/16-D12: X = 21.5
LSN-2.5/16-D12: X = 16.2
LSN-3.3/16-D12: X = 12.1
LSN-5/16-D12: X = 7.5
Note: Resistor values are in kΩ. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage. VONOM = nominal output voltage.
"T" Model LSN-T/16-D12
This version of the LSN 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.
The trim may also be adjusted using an external reference voltage con-
nected to the Trim input.
As with other trim adjustments, use a 1% metal film precision resistor with
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.
The resistor trim up equation for the LSN-T/16-D12 is as follows:
RTRIMUP (Ω) =
10500
VO – 0.7525
– 1000
Where VO is the desired output voltage.
The LSN-T/16-D12 fixed resistance values to set the output values are:
VOUT
(typ.)
RTRIM
(kΩ)
0.7525 1.0 1.2 1.5 1.8 2 2.5 3.3 5.0
Open 41.424 22.46 13.05 9.024 7.417 5.009 3.122 1.472
CAUTION: To retain proper regulation, do not exceed the 5 Volt output.
Voltage Trim
The LSN-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 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 = 0.7 –(0.0667 × (VO – 0.7525))
The LSN-T/16-D12 fixed trim voltages to set the output voltage are:
VOUT
(typ.)
0.7525
1.0
1.2
1.5
1.8
2
2.5 3.3 5.0
VTRIM Open 0.6835 0.67 0.65 0.63 0.617 0.583 0.53 0.4166
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MDC_LSN 16A D12 Models.B02 Page 7 of 13