參數(shù)資料
型號(hào)： L6714TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64
封裝： 10 X 10 MM, LEAD FREE, TQFP-64
文件頁數(shù)： 44/70頁
文件大?。?/td> 694K
代理商： L6714TR
L6714
Maximum Duty-cycle limitation
49/70
17
Maximum Duty-cycle limitation
The device limits the maximum duty cycle and this value is not fixed but it depends on the
delivered current given by the following relationship:
From the previous relationships the maximum duty cycle results:
If the desired output characteristic crosses the limited-DMAX maximum output voltage, the
output resulting voltage will start to drop after the cross-point. In this case the output voltage
starts to decrease following the resulting characteristic (dotted in Figure 19) until UVP is
detected or anyway until IDROOP=140A.
Figure 19.
Maximum Duty-Cycle (left) and limited DMAX output voltage (right)
D
max
()
0.80
I
DROOP
2.857k
×
()
–
0.80
R
SENSE
R
g
---------------------
I
×
OUT
2.857k
×
–
==
D
max
()
80%
I
DROOP
0
A
=
40%
I
DROOP
140
A
=
=
DMAX
40 %
Maximum Duty Cycle
80 %
IDROOP = 140A
(IOCP = N x IOCPx )
IDROOP
VOUT
0.40 VIN
Limited DMAX Output Voltage
0.80 VIN
IOCP = N x IOCPx
(IDROOP = 140A)
IOUT
Desired output Char.
UVP Threshold
Resulting Output Char.
Limted-DMAX Output Char.
相關(guān)PDF資料
PDF描述
L6714 SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64
L6725TR 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6728ATR SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO10
L6728A SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO10
L6728D 30 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO10
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