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参数资料
| 型号： | LSN-T/16-W3J |
| 厂商： | CD TECHNOLOGIES INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 6/8页 |
| 文件大小： | 504K |
| 代理商： | LSN-T/16-W3J |
LSN-16A W3 Series
N O N - I S O L A T E D , W I D E I N P U T D C / D C C O N V E R T E R S
6
"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:
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.
LSN W3 DC/DC converters do not suffer from Output Reverse Conduction.
They employ proprietary gate drive circuitry that makes them immune to
moderate applied output overvoltages.
Thermal Considerations and Thermal Protection
The typical output-current thermal-derating curves shown below enable
designers to determine how much current they can reliably derive from each
model of the LSN W3 Series under known ambient-temperature and air-ow
conditions. Similarly, the curves indicate how much air ow is required to reli-
ably deliver a specic output current at known temperatures.
The highest temperatures in LSN W3's occur at their output inductor, whose
heat is generated primarily by I2R losses. The derating curves were devel-
oped using thermocouples to monitor the inductor temperature and varying
the load to keep that temperature below +110°C under the assorted condi-
tions of air ow and air temperature. Once the temperature exceeds +115°C
(approx.), the thermal protection will disable the converter. Automatic restart
occurs after the temperature has dropped below +110°C.
As you may deduce from the derating curves and observe in the efciency
curves on the following pages, LSN W3's maintain virtually constant efciency
from half to full load, and consequently deliver very impressive temperature
performance even if operating at full load.
Lastly, when LSN W3's are installed in system boards, they are obviously
subject to numerous factors and tolerances not taken into account here. If you
are attempting to extract the most current out of these units under demand-
ing temperature conditions, we advise you to monitor the output-inductor
temperature to ensure it remains below +110°C at all times.
Figure 7.Trim Connections Using Fixed Resistors
Figure 6.Trim Connections Using a Trimpot
Trim Equations
Note: Resistor values are in k
. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage. VO
NOM = nominal output voltage.
Note: Install either a xed
trim-up resistor or a xed
trim-down resistor depending
upon desired output voltage.
RTRIM (
) = _____________ –5110
VO – 0.7525
21070
VOUT (Typ.)
0.75V
1.0V
1.2V
1.5V
1.8V
2.5V
3.3V
RTRIM (k
)
Open
80.021
41.973
23.077
15.004
6.947
3.16
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