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參數(shù)資料
| 型號： | TDA21201-S7 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Integrated Switch(MOSFET Driver and MOSFETs) |
| 中文描述： | 集成開關(guān)（MOSFET驅(qū)動器和MOSFET） |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 754K |
| 代理商： | TDA21201-S7 |
Preliminary Data Sheet
TDA21201
Page 11
Apr-29, 2002
Having the power dissipation Pd of the Integrated Switch, the required thermal
resistance RthCA can be calculated. RthCA is the value of the heat sink
attached to the TO-220 version of the Integrated Switch. RthCA is the
“effective” thermal resistance (takes airflow etc. into account):
Rthjc
Pd
TA
Tj
RthCA
≤
max
_
Wherein:
R
th
CA = Thermal resistance from the package’s metal backside
(= lead frame) to ambient air that is required to operate the
Integrated Switch under given load and environmental
conditions without exceeding the maximum allowed
junction temperature; in [°C/W]
T
j_max
= Maximum allowed junction temperature of the Integrated
Switch; in [°C], use 110 °C for the SMD version of the
Integrated Switch, use 125 °C for the TO-220 version of
the Integrated Switch
TA = The ambient temperature; in [°C], usually this is the
maximum temperature of the surrounding air @ worst
case, e.g. 55 °C
Pd = The power loss generated in the Integrated Switch that
needs to be dissipated through the heat sink
à
air
(TO-220) or the PCB
à
air for thermal balance; in [W], use
one of the two diagrams Pd vs. Iphase or Pd vs. f_sw to
find the this value for your particular application
R
th
jc = Thermal resistance junction to case of the Integrated Switch;
in [K/W], use
≤
2 K/W (s. also pg. 3 and 4 “Thermal
characteristic of the High side/Low side MOSFET” in this
data sheet; the majority of the losses are generated within
the MOSFETs, not in the driver)
Efficiency of a DC/DC converter using the Integrated Switch TDA21201
The following measurements were performed on a 4-phase Evaluation Board.
Phase 4 can be disabled so that the converter operates in a 3-phase mode.
Boundary Conditions: Vcc = 12 V, Vo = 1.6 V, TDA21201 as SMD
I 4-Phase Converter: Efficiency vs. Load current
65
70
75
80
85
90
95
0
20
40
60
80
Load Current [A]
E
f_1 = 185 kHz
f_2 = 305 kHz
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