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参数资料
| 型号： | LSM-1.5/16-W3 |
| 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： | 10/12页 |
| 文件大小： | 973K |
| 代理商： | LSM-1.5/16-W3 |
LSM-16A W3 Models
N O N - I S O L A T E D , W I D E I N P U T S M T D C / D C C O N V E R T E R S
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.
LSM W3 SMT DC/DC converters do not suffer from Output Reverse Conduc-
tion. 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 LSM W3 SMT's 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 LSM W3 SMT's occur at their output inductor,
whose heat is generated primarily by I2R losses. The derating curves were
developed using thermocouples to monitor the inductor temperature and
varying the load to keep that temperature below +110°C under the assorted
conditions 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, LSM W3 SMT'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 LSM W3 SMT's are installed in system boards, they are obvi-
ously 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
demanding temperature conditions, we advise you to monitor the output-
inductor temperature to ensure it remains below +110°C at all times.
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