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參數(shù)資料
| 型號(hào)： | TK72190CS |
| 廠商： | TOKO INC |
| 元件分類： | 固定負(fù)電壓單路輸出標(biāo)準(zhǔn)穩(wěn)壓器 |
| 英文描述： | 9 V FIXED NEGATIVE REGULATOR, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 660K |
| 代理商： | TK72190CS |
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TK721xxCS
GC3-K020B
Page 25
12-3.
Operating Region and Power Dissipation
The power dissipation of the device is dependent on the
junction temperature. Therefore, the package dissipation
is assumed to be an internal limitation. The package itself
does not have enough heat radiation characteristic due to
the small size. Heat runs away by mounting IC on PCB.
This value changes by the material, copper pattern etc. of
PCB.
The overheating protection operates when there is a lot of
loss inside the regulator (Ambient temperature high, heat
radiation bad, etc.). The output current and the output
voltage will drop when the protection circuit operates.
When joint temperature (Tj) reaches the set temperature,
IC stops the operation. However, operation begins at once
when joint temperature(Tj) decrease.
The thermal resistance when mounted on PCB
The chip joint temperature during operation is shown by
Tj=
θja×Pd+Ta. Joint part temperature (Tj) of
TK721xxCS is limited around 150
°C with the
overheating protection circuit. Pd is the value when the
overheating protection circuit starts operation.
When you assume the ambient temperature to be 25
°C,
150=
θja×Pd(W)+25
θja×Pd=125
θja=125/Pd (°C /W)
Example of mounting substrate
PCB Material: Two layer glass epoxy substrate
(x=30mm,y=30mm,t=1.0mm,Copper pattern thickness
35um)
Please do derating with 5.9mW/
°C at Pd=736mW and
25
°C or higher. Thermal resistance is (θja=170°C /W)
Method of obtaining Pd easily
Connect output terminal to GND(short circuited), and
measure the input current by increasing the input voltage
gradually up to 10V. The input current will reach the
maximum output current, but will decrease soon
according to the chip temperature rising, and will finally
enter the state of thermal equilibrium (natural air cooling)
The input current and the input voltage of this state will
be used to calculate the Pd.
Pd(mW)
Vin (V) × Iin (mA)
When the device is mounted, mostly achieve 600mW or
more.
0
25
50
75
100
150
Pd(mW)
Pd
D Pd
2
3
5
4
Ta (℃)
Procedure (When mounted on PCB).
1.Find Pd (Vin
×Iin when the output is short-circuited).
2. Plot Pd against 25
°C.
3. Connect Pd to the point corresponding to the 150
°C with a
straight line.
4. Pull a vertical line from the maximum operating temperature in
your design (e.g., 75
°C).
5. Read the value of Pd against the point at which the vertical line
intersects the derating curve(DPd).
6. DPd
÷ (VinmaxVout)=Iout (at 75°C)
The maximum output current at the highest operating
temperature will be Iout
DPd ÷÷÷÷ (VinMaxVout).
Please use the device at low temperature with better
radiation. The lower temperature provides better quality.
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