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| 型号： | TPS54160DGQR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.7 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 14/50页 |
| 文件大小： | 1375K |
| 代理商： | TPS54160DGQR |
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(
)
( )
+
÷
=
÷
-
+
è
L
dc
OUT
d
SW max skip
ON
IN
L
d
DS on
I
R
V
1
f
t
V
I
R
V
( )
+
÷
=
÷
-
+
è
L
dc
d
OUT sc
DIV
SWshift
ON
IN
L
d
DS on
I
R
V
f
t
V
I
R
V
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
www.ti.com
SLVS795C – OCTOBER 2008 – REVISED OCTOBER 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 causes 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, consider that the output
voltage decreases from the nominal voltage to 0 V, the fDIV integer increases from 1 to 8 corresponding to the
frequency shift.
In Figure 42, the solid line illustrates a typical safe operating area regarding frequency shift and assumes the
output voltage is 0 V, and the resistance of the inductor is 0.1
, FET on-resistance of 0.2 and the diode
voltage drop is 0.5 V. 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
VOUT(sc)
output voltage during short
Vd
diode voltage drop
RDS(on)
switch on resistance
tON
controllable on time
fDIV
frequency divide equals (1, 2, 4, or 8)
Figure 42. Maximum Switching Frequency vs. Input Voltage
Copyright 2008–2010, Texas Instruments Incorporated
21
Product Folder Link(s): TPS54160
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