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參數(shù)資料
| 型號： | TPS54140QDRCRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO10 |
| 封裝： | GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 14/50頁 |
| 文件大?。?/td> | 1602K |
| 代理商： | TPS54140QDRCRQ1 |
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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
10
20
30
40
2500
2000
1500
1000
500
0
f
-SwitchingFrequency-kHz
s
V -InputVoltage-V
I
Skip
Shift
V =3.3V
O
SLVSA24B
– OCTOBER 2009 – REVISED MARCH 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 42, 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 0.1
, 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 42. Maximum Switching Frequency vs. Input Voltage
Copyright
2009–2011, Texas Instruments Incorporated
21
Product Folder Link(s): TPS54140-Q1
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| TPS54160 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.5-A, 60-V, STEP-DOWN SWIFT DC/DC CONVERTER WITH ECO-MODE |
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