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参数资料
| 型号： | FA5310BS |
| 厂商： | FUJI ELECTRIC CO LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 4/19页 |
| 文件大小： | 2198K |
| 代理商： | FA5310BS |
DIS
CO
NT
INU
ED
Se
pte
mb
er
200
2
36
FA531X series
Fig. 29 OUT terminal voltage wavefrom
6. Notice for high frequency operation
(1) The final pulse
These ICs have the original characteristics about the pulse
width at OUT terminal when the IC is stopped by undervoltage
lockout, ON/OFF function, or latched mode for overload or
overvoltage.
When the IC is stopped, the final pulse width is 2
s(max.)
longer than normal pulse width as shown in Figure. 29.
Here, normal pulse width "A
s" is determined by measured
condition of the power supply unit, and whole width of final
pulse is "A+2
s(max.)".
Take care of a longer pulse mentioned above for designing or
testing the circuit of power supply units.
(2) Power dissipation and heating
The power dissipation of IC increases and the temperature
becomes higher in proportion to the operating frequency,
because the driving power of a switching device and the
through current of output stage of IC increase.
Determine the oscillation frequency so that the junction
temperature (Tj) does not rise to 125C.
Tj is calculated as following equation roughly.
Tj = Tc +
θj - c Vcc Icc
Tc: Case temperature
θj-c: Thermal resistance between the junction
Vcc: VCC voltage
and the case (=50C/W)
I CC: Supply current at the VCC terminal
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