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参数资料
| 型号： | LSN-T/16-W3H-C |
| 厂商： | MURATA POWER SOLUTIONS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, SIP-11/10 |
| 文件页数： | 6/8页 |
| 文件大小： | 215K |
| 代理商： | LSN-T/16-W3H-C |
Adjustment beyond the specied ±10% adjustment range is not recom-
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.
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 LSN-T/16-W3:
LSN-T/16-W3 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 (kΩ)
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 LSN-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 5k
:. 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 –(0.1698 x (VO – 0.7525))
The LSN-T/16-W3 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
Output Reverse Conduction
Many DC/DC’s using synchronous rectication 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.
Trim
Down
LOAD
+INPUT
COMMON
+OUTPUT
TRIM
COMMON
Trim
Up
Note: Install either a fixed
trim-up resistor or a fixed
trim-down resistor depending
on desired output voltage.
RTRIM (
:) = _____________ –5110
VO – 0.7525
21070
Figure 7. Trim Connections Using Fixed Resistors
A trimpot can be used to determine the value of a single xed resistor
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.
The equations below can be starting points for selecting specic trim-resistor
values. Recall, untrimmed devices are guaranteed to be ±1% accurate.
Trim Equations
Note: Resistor values are in k
:. Accuracy of adjustment is subject to toler-
ances of resistors and factory-adjusted, initial output accuracy. VO = desired
output voltage. VONOM = nominal output voltage.
Single Output LSN-W3 Models
Non-Isolated, 3-5.5VIN, 0.75-3.3VOUT
16 Amp DC/DC Converters
www.murata-ps.com
email: sales@murata-ps.com
10 Dec 2009
MDC_LSN W3 Models.A02 Page 6 of 8
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