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参数资料
| 型号： | TK73425TCB-G |
| 厂商： | TOKO INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.48 V DROPOUT, PDSO6 |
| 封装： | SOT89L-5, 6 PIN |
| 文件页数： | 10/22页 |
| 文件大小： | 296K |
| 代理商： | TK73425TCB-G |
TK734xxT
GC3-M001
Page 18
12-2. Operating Region and Power Dissipation
Power dissipation capability is limited by the junction
temperature that triggers the built-in overheat protection
circuit. Therefore, power dissipation capability is
regarded as an internal limitation. The package itself does
not offer high heat dissipation because of its small size.
The package is, however, designed to release heat
effectively when mounted on the PCB. Therefore, the
heat-dissipation value will vary depending on the material,
copper pattern, etc. of the PCB on which the package is
mounted.
When the regulator loss is large (high ambient
temperature, poor heat radiation), the overheat protection
circuit is activated. When this occurs, output current
cannot be obtained, and an output voltage drop is
observed. When the junction temperature reaches the set
value, the IC stops operating. However, after the IC has
stopped operation and the junction temperature lowers
sufficiently, the IC restarts operation immediately.
How to determine the thermal resistance when
installation on PCB
The chip junction temperature during operation is
expressed by
25
P
θ
T
D
ja
j
+
×
=
The junction temperature of the TK734xxT is limited to
approximately 145
°C by the overheat protection circuit.
PD is the value observed when the overheat protection
circuit is activated. The following example is based on an
ambient temperature of 25
°C.
25
P
θ
145
D
ja
+
×
=
120
P
θ
D
ja
=
×
D
ja
P
120
θ
=
(°C/W)
!
Example of installation on circuit board
Glass epoxy substrate with double-layer wiring
(copper pattern thickness: 35
m)
In the above installation example, PD is 1700mW. If the
temperature exceeds 25
°C, be sure to derate at -
13.6mW/
°C.
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