參數(shù)資料
型號(hào)： L6591TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO16
封裝： ROHS COMPLIANT, SOP-16
文件頁(yè)數(shù)： 17/32頁(yè)
文件大小： 560K
代理商： L6591TR
Application information
L6591
24/32
Doc ID 14821 Rev 4
Figure 16.
Soft-start pin operation under different operating conditions
While in case of feedback loop failure the system must be stopped quickly to prevent the
output voltage from reaching too high values, an overload or a short circuit does not
generally need such fast intervention. The L6591 makes it easier to handle such conditions:
the 2 V clamp on the SS pin is removed and a second internal current generator ISS2 = ISS1
/4 keeps on charging Css. If the voltage reaches 5 V the IC will be disabled, if it is allowed to
reach 2 VBE over 5 V, the IC will be latched off. In the former case the resulting behavior will
be identical to that under short circuit illustrated in Figure 11; in the latter case the result will
be identical to that of Figure 12. The time delay before stopping switching upon overload is:
Equation 9
If the overload disappears before the SS voltage reaches 5 V the ISS2 generator will be
turned off and the voltage gradually brought back down to 2 V. A diode, with the anode to the
SS pin and the cathode connected to the VREF pin (#6) allows the designer to select either
an auto-restart mode or a latch-mode behavior upon overload.
If latch-mode behavior is desired also for converter
’s short circuit, make sure that the supply
voltage of the IC never falls below the UVLO threshold before activating the latch. Figure 18
shows soft-start pin behavior under different operating conditions.
shows a typical high-power adapter application that uses the L6591 in conjunction
with the L6563 PFC controller.
1
SS
delay
I
C
12
T
=
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相關(guān)代理商/技術(shù)參數(shù)
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