参数资料
型号: PQ1CF2J0000H
厂商: SHARP ELECTRONICS CORP
元件分类: 稳压器
英文描述: 1.5 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PZFM5
封装: TO-220, 5 PIN
文件页数: 2/12页
文件大小: 93K
代理商: PQ1CF2J0000H
Chopper Regulators
PQ1CF2
Precations in designing heat sink
Area of heat sink is obtained as follows,
(A)Increasing junction temperature difference from ambient temperature(
Tj )is obtained as follows.
Tj=Tj–Ta
It is recommended that Tj=70 to 80% of TjMAX.
(B)Thermal resistance Rth(j-a) is obtained from
Tj and internal dissipation loss (P)obtained from equation q
Thermal resistance Rth(j-a)=
Tj/P C/W
(C)Thermal resistance of heat sink Rth(c-a) is obtained from Rth(j-a)
Thermal resistance Rth(c-a)<=Rth(j-a)–Rth(j-c) C/W
On condition that Rth(j-c) of PQ1CF2=6.67C/W
(D)Area of heat sink is obtained from thermal resistance Rth(c-a) with thermal resistance-heat sink area
characteristics.
PQ1CF2
Regulator
heat sink
View of regulator attached
on the center of square
heat sink.
Fig. 8 Power Dissipation vs. Ambient
Temperature
Fig. 9 Thermal Resistance vs. Area of Heat
sink
0
5
10
15
20
–20
0
PD2
PD1
40
20
80
60
100
Power
dissipation
P
D
(W)
Ambient temperature Ta ( C )
PD1 :No heat sink
PD2 :With infinite heat sink
2mm thickness aluminum plate
1000
10
100
1
1000
Thermal
resistance
Rth
(c-a)
(
C/W)
Area of heat sink S(cm2)
10
Oblique line portion : Overheat protection may operate in this area.
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