参数资料
型号: TPS54260EVM-597
厂商: Texas Instruments
文件页数: 21/52页
文件大小: 0K
描述: EVAL MODULE FOR TPS54260
标准包装: 1
系列: SWIFT™
主要目的: DC/DC,步降
输出及类型: 1,非隔离
输出电压: 3.3V
电流 - 输出: 2.5A
输入电压: 10.8 ~ 13.2 V
稳压器拓扑结构: 降压
频率 - 开关: 300kHz
板类型: 完全填充
已供物品:
已用 IC / 零件: TPS54260
其它名称: 296-30449
TPS54260EVM-597-ND
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.
? ( V IN - I L ′ Rhs + Vd ) ÷
f SW ( max skip ) = ? ÷ ′ ? ÷
?   1  ?   ? ( I L ′ Rdc+V OUT +Vd ) ?
è t ON ? è ?
(12)
f div ? (I L ′ Rdc + V OUTSC + Vd) ?
( V IN L I x Rhs + Vd ) ?
′? ÷
t ON
è
f SW ( shift ) =
? - ÷
(13)
I L
Rdc
V IN
V OUT
V OUTSC
Vd
R DS(on)
t ON
? DIV
inductor current
inductor resistance
maximum input voltage
output voltage
output voltage during short
diode voltage drop
switch on resistance
controllable on time
frequency divide equals (1, 2, 4, or 8)
2500
2000
1500
Skip
1000
500
0
Shift
V O = 3.3 V
10
20
30
40
50
60
V I - Input Voltage - V
Figure 40. Maximum Switching Frequency vs. Input Voltage
Copyright ? 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54260
21
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