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| 型号： | TPS54240QDGQRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 15/48页 |
| 文件大小： | 1447K |
| 代理商： | TPS54240QDGQRQ1 |
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(
)
(
)
(
)
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
SLVSAQ4A
– 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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| TPS54240QDRCRQ1 | 功能描述:Buck, Split Rail Switching Regulator IC Positive Adjustable 0.8V 1 Output 2.5A 10-VFDFN Exposed Pad 制造商:texas instruments 系列:汽车级，AEC-Q100，SWIFT?，Eco-Mode? 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压，分离轨 输出类型:可调式 输出数:1 电压 - 输入（最小值）:3.5V 电压 - 输入（最大值）:42V 电压 - 输出（最小值/固定）:0.8V 电压 - 输出（最大值）:39V 电流 - 输出:2.5A 频率 - 开关:100kHz ~ 2.5MHz 同步整流器:无 工作温度:-40°C ~ 125°C（TA） 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商器件封装:10-VSON（3x3） 标准包装:1 |
| TPS54260 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.5V to 60V INPUT, 2.5A, STEP DOWN CONVERTER WITH ECO-MODE? |
| TPS54260_1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.5V to 60V INPUT, 2.5A, STEP DOWN CONVERTER WITH ECO-MODE? |
| TPS54260_2 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.5V to 60V INPUT, 2.5A, STEP DOWN CONVERTER WITH ECO-MODE? |
| TPS54260DGQ | 功能描述:直流/直流开关调节器 3.5-60V 2.5A 2.5MHz Step Down Converter 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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