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参数资料
| 型号： | PKG4623PI |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT 60 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 15/20页 |
| 文件大小： | 1395K |
| 代理商： | PKG4623PI |
4
PKG4000ISeriesDatasheetEN/LZT14604R3AEricssonPowerModules,April2007
ThermalData
Two-parametermodel
Power dissipation is generated in the components mounted
on the ceramic substrate. The thermal properties of the PKG
DC/DC converter is determined by thermal conduction in the
connected pins and thermal convection from the substrate
via the case.
The two-parameter model characterizes the thermal proper-
ties of the PKG DC/DC converter and the equation below
can be used for thermal design purposes if detailed informa-
tion is needed. The values are given for a module mounted
on a printed board assembly (PBA).
Note that the thermal resistance between the substrate and
the air,
Rth sub-A is strongly dependent on the air velocity.
Tsub = Pd × Rth sub-P × Rth sub-A/(Rth sub-P + Rth sub-A) + (TP–TA)
× Rth sub-A/(Rth sub-P + Rth sub-A) + TA
Where:
Pd
: dissipated power, calculated as PO × (1/η-1)
Tsub
: max average substrate temperature,
≈ TCmax
TA
: ambient air temperature at the lower side of the
power module
TP
: average pin temperature at the PB solder joint
Rth sub-P : thermal resistance from Tsub to the pins
Rth sub-A : thermal resistance from Tsub to TA
v
: velocity of ambient air.
Air velocity in free convection is 0.2– 0.3 m/s (40-60 lfm).
Over TemperatureProtection(OTP)
The PKG DC/DC converters have an internal over tempera-
ture protection circuit. If the case temperature exceeds min
+115 °C the power module will go in to OTP-mode. As long
as the case temperature exceeds min +115°C the power
module will operate in OTP-mode.
During the OTP-mode the DC/DC converter will shut down
completely and when the case temerature has decreased
25°C the converter will automatically restart.
10
15
20
0
5
0
2
6
4
Air velocity (m/s)
R
(C/W)
th
sub-
A
R
= 2.5 C/W
th sub-P
Singleoutput
Fundamentalcircuitdiagrams
ElectricalData
3
2
1
4
Case
Control
Isolated feedback
9
8
10
Dualoutput
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