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| 型号： | TPS54140DGQR |
| 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： | 14/46页 |
| 文件大小： | 1778K |
| 代理商： | TPS54140DGQR |
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Selecting the Switching Frequency
(
)
(
)
( )
+
÷
=
÷
-
+
è
f
L
OUT
SW max skip
IN
L
ON min
DS on
I
Rdc
V
Vd
1
t
V
I
R
Vd
(12)
(
)
( )
(
)
(
)
L
OUTSC
SW max shift
ON min
IN
OUTSC
L
DS on
(I
Rdc
V
Vd)
div
t
V
2 V
I
R
Rdc
Vd
÷
+
=
÷
÷
-
+
+
è
f
(13)
10
20
30
40
2500
2000
1500
1000
500
0
f
-SwitchingFrequency-kHz
s
V -InputVoltage-V
I
Skip
Shift
V =3.3V
O
www.ti.com .............................................................................................................................................................................................. SLVS889 – OCTOBER 2008
DETAILED DESCRIPTION (continued)
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 0.1
, 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.
IL
inductor current
Rdc
inductor resistance
VIN
maximum input voltage
VOUT
output voltage
VOUTSC
output voltage during short
Vc
diode voltage drop
RDS(on)
switch on resistance
tON(min)
minimum controllable on time
DIV
frequency divide equals (1, 2, 4, or 8)
Figure 41. Maximum Switching Frequency vs. Input Voltage
Copyright 2008, Texas Instruments Incorporated
21
Product Folder Link(s): TPS54140
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| TPS54140QDRCRQ1 | 功能描述:直流/直流开关调节器 AC 3.5-42V Inp,1.5A RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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