參數(shù)資料
型號： TPS54260QDGQRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 2.5 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： GREEN, PLASTIC, MSOP-10
文件頁數(shù)： 15/48頁
文件大?。?/td> 1456K
代理商： TPS54260QDGQRQ1
(
)
(
)
(
)
L
OUT
SW max skip
ON
IN
L
I
Rdc
V
Vd
1
t
V
I
Rhs
Vd
+
=
÷
÷
÷
-
+
è
è
f
(
)
(
)
L
OUTSC
SW shift
ON
IN
L
(I
Rdc
V
Vd)
div
t
V
I x Rhs
Vd
+
=
÷
÷
-
+
è
f
10
20
30
40
2500
2000
1500
1000
500
0
f
-SwitchingFrequency-kHz
s
V -InputVoltage-V
I
Skip
Shift
V =3.3V
O
SLVSAH8A
– DECEMBER 2010 – REVISED APRIL 2011
DETAILED DESCRIPTION (continued)
Selecting the Switching Frequency
The switching frequency that is selected should be the lower value of the two equations, Equation 12 and
Equation 13. Equation 12 is the maximum switching frequency limitation set by the minimum controllable on time.
Setting the switching frequency above this value will cause the regulator to skip switching pulses.
Equation 13 is the maximum switching frequency limit set by the frequency shift protection. To have adequate
output short circuit protection at high input voltages, the switching frequency should be set to be less than the
fsw(maxshift) frequency. In Equation 13, to calculate the maximum switching frequency one must take into
account that the output voltage decreases from the nominal voltage to 0 volts, the fdiv integer increases from 1 to
8 corresponding to the frequency shift.
In Figure 41, the solid line illustrates a typical safe operating area regarding frequency shift and assumes the
output voltage is zero volts, and the resistance of the inductor is 0.130
, FET on resistance of 0.2 and the
diode voltage drop is 0.5V. The dashed line is the maximum switching frequency to avoid pulse skipping. Enter
these equations in a spreadsheet or other software or use the SwitcherPro design software to determine the
switching frequency.
(12)
(13)
IL
inductor current
Rdc
inductor resistance
VIN
maximum input voltage
VOUT
output voltage
VOUTSC
output voltage during short
Vd
diode voltage drop
RDS(on)
switch on resistance
tON
controllable on time
DIV
frequency divide equals (1, 2, 4, or 8)
Figure 41. Maximum Switching Frequency vs. Input Voltage
22
Copyright
2010–2011, Texas Instruments Incorporated
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