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型号： TPS54260DGQR
厂商： TEXAS INSTRUMENTS INC
元件分类： 稳压器
英文描述： SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封装： GREEN, PLASTIC, MSOP-10
文件页数： 14/49页
文件大小： 1808K
代理商： TPS54260DGQR
(
)
(
)
(
)
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
Skip
Shift
10
20
30
40
50
60
2500
2000
1500
1000
500
0
f
-SwitchingFrequency-kHz
s
V -InputVoltage-V
I
V =3.3V
O
TPS54260
www.ti.com
SLVSA86A – MARCH 2010 – REVISED DECEMBER 2010
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 40, 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 40. Maximum Switching Frequency vs. Input Voltage
Copyright 2010, Texas Instruments Incorporated
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Product Folder Link(s): TPS54260
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