參數(shù)資料
型號(hào)： 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(yè)數(shù)： 29/50頁(yè)
文件大小： 1602K
代理商： TPS54140QDRCRQ1
Co × Resr
C
=
Rc
( )
(
)
( )
=
OUT
C
REF
MOD fc
Z mod
EA
V
R
G
f
gm
V
1
Cc =
× Rc × p mod
p
1
C
=
2
Rc
z mod
p
VO
IO
VIN
VOUT
EN
IL
VOUT
VIN
IL
VOUT
IL
PH
SLVSA24B
– OCTOBER 2009 – REVISED MARCH 2011
(50)
For cases where the modulator zero is less than the cross over frequency (Aluminum or Tantalum capacitors),
the equations are:
(51)
(52)
(53)
For the example problem, the ESR zero is located at a higher frequency compared to the cross over frequency
so Equation 50 through Equation 53 are used to calculate the compensation components. For the example
problem, the components are calculated to be: Rc= 76.2k
, Cc= 2710pF, and Cf =6.17pF.
The calculated value of the Cf capacitor is not a standard value so a value of 2700pF will be used. 6.8pF is used
for Cc. Rc resistor sets the gain of the error amplifier which determines the cross over frequency. The calculated
Rc resistor is not a standard value, so 76.8k
will be used.
APPLICATION CURVES
Figure 52. Load Transmit
Figure 53. Startup With EN
Figure 54. VIN Power Up
Figure 55. Output Ripple CCM
Copyright
2009–2011, Texas Instruments Incorporated
35
Product Folder Link(s): TPS54140-Q1
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