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参数资料
| 型号： | LGDS-300-0-K/T |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-9 |
| 文件页数： | 11/13页 |
| 文件大小： | 805K |
| 代理商： | LGDS-300-0-K/T |
For locations, phone, fax, E-Mail see back cover
7
LGDS-300 Series
Gaia Converter FC08-059.01/10 Revision D
4
Hi-Rel
Grade
8- Thermal Characteristics
Characteristics
Conditions
Limit or typical
Performances
Operating ambient temperature
range at full load
Ambient temperature *
Minimum
Maximum
- 40°C
+ 85°C
Operating case temperature
range at full load
Case temperature
Minimum
Maximum
- 40°C
+105°C
Storage temperature range
Non functionning
Minimum
Maximum
- 55°C
+ 125°C
Thermal resistance
Rth case to ambient in free air
natural convection
Typical
12°C /W
Note * : The upper temperature range depends on configuration, the user must assure a max. case temperature of + 105°C.
10
30
80
70
60
90
20
40
50
25%
75%
50%
100%
Power (W)
Temperature (C)
Full load ambient temperature without derating : 75C
Maximum case temperature : 105C
Natural convection operation area
Additionnal cooling operation area
Maximum storage temperature : 125C
The LGDS-300 series operating
case temperature at full load must not exceed 105°C. The maximum ambient temperature
admissible for the DC/DC converter corresponding to the maximum operating case temperature of 105°C depends on the
ambient airflow, the mounting/orientation, the cooling features and the power dissipated.
To calculate a maximum admissible ambient temperature the following method can be used. Knowing the maximum case
temparature Tcase = 105°C of the module, the power used Pout and the efficiency
η :
determine the power dissipated by the module Pdiss that should be evacuated :
Pdiss = Pout(1/
ηηηηη - 1)
determine the maximum ambient temperature :
Ta = 105°C - Rth x Pdiss
where
Rth is the thermal resistance from the case to ambient.
The previous thermal calculation shows two areas of operation :
a normal operation area in a free natural ambient convection (grey area in the following graph),
an area with cooling features (air flow or heatsink) ensuring a maximum case temperature below the maximum
operating case temperature of 105°C at full load (white area in the following graph).
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