LSN-1.2/16-W3J-C Murata Power Solutions Inc, LSN-1.2/16-W3J-C Datasheet - Page 6

• Manufacturer Part Number: LSN-1.2/16-W3J-C
• Description: DC/DC TH 16A W3-1.2V RPV Non-Iso
• Manufacturer: Murata Power Solutions Inc
• Series: LSNr

Specifications of LSN-1.2/16-W3J-C

• Product: Non-Isolated / POL
• Output Power: 19 W
• Input Voltage Range: 3 V to 5.5 V
• Input Voltage (nominal): 5 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 1.2 V
• Output Current (channel 1): 16 A
• Package / Case Size: SIP
• Output Type: Low Voltage Reversed Pin
• Output Voltage: 1.2 V
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

which can then be connected, as shown in Figure 7, between the Trim pin and
+Output to trim down the output voltage, or between the Trim pin and Common
to trim up the output voltage. Fixed resistors should have absolute TCR’s less
than 100ppm/qC to ensure stability.
values. Recall, untrimmed devices are guaranteed to be ±1% accurate.
A trimpot can be used to determine the value of a single fi xed resistor
The equations below can be starting points for selecting specifi c trim-resistor
Note: Resistor values are in k:. Accuracy of adjustment is subject to toler-
ances of resistors and factory-adjusted, initial output accuracy. V
output voltage. V
+INPUT
COMMON
Figure 7. Trim Connections Using Fixed Resistors
O NOM
+OUTPUT
COMMON
= nominal output voltage.
TRIM
Trim Equations
Trim
Down
Trim
Up
LOAD
Note: Install either a fixed
trim-up resistor or a fixed
trim-down resistor depending
on desired output voltage.
www.murata-ps.com
O
= desired
mended. When using trim in combination with Remote Sense, the maximum
rated power must not be exceeded (see Remote Sense).
“T” Model (LSN-T/16-W3)
This version of the the LSN-W3 series offers a special output voltage trim-
ming feature which is fully compatible with competitive units. The output
voltage may be varied using a single trim resistor from the Trim Input to Power
Common. The output voltage range is 0.75 Volts to 3.3 Volts.
input supply must be 4.5 Volts minimum.
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.
Voltage Trim
between the Trim input and Output Common. Be aware that the internal “load”
impedance looking into the Trim pin is approximately 5k:. Therefore, you may
have to compensate for this in the source resistance of your external voltage
reference.
Output Reverse Conduction
Many DC/DC’s using synchronous rectifi cation suffer from Output Reverse
Conduction. If those devices have a voltage applied across their output before
a voltage is applied to their input (this typically occurs when another power
supply starts before them in a power-sequenced application), they will either
fail to start or self destruct. In both cases, the cause is the “freewheeling” or
“catch” FET biasing itself on and effectively becoming a short circuit.
V
V
R
OUT
OUT
TRIM
Adjustment beyond the specifi ed ±10% adjustment range is not recom-
IMPORTANT: For outputs greater than 3 Volts up to 3.3 Volts maximum, the
As with other trim adjustments, be sure to use a precision low-tempco
The trim equation is as follows for the LSN-T/16-W3:
LSN-T/16-W3 fi xed resistance values to set the output voltages are:
CAUTION: To retain proper regulation, do not exceed the 3.3V output
The LSN-T/16-W3 may also be trimmed using an external voltage applied
The equation for this voltage adjustment is:
The LSN-T/16-W3 fi xed trim voltages to set the output voltage are:
Single Output LSN-W3 Models
V
TRIM
(Typ.) 0.75V
(Typ.) 0.75V
(kΩ)
R
TRIM
V
TRIM
(:) = _____________ –5110
Open 0.6928V 0.624V 0.5731V 0.5221V 0.4033V 0.267V
Open
(in Volts) = 0.7 –(0.1698 x (V
V
O
80.021 41.973 23.077 15.004
– 0.7525
1.0V
1.0V
21070
Non-Isolated, 3-5.5V
10 Dec 2009
1.2V
1.2V
16 Amp DC/DC Converters
MDC_LSN W3 Models.A02 Page 6 of 8
1.5V
1.5V
O
– 0.7525))
email: [e-mail]
1.8V
1.8V
IN
, 0.75-3.3V
6.947
2.5V
2.5V
3.3V
3.16
3.3V
OUT