參數(shù)資料
型號： TPS5401DGQT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： PLASTIC, MSOP-10
文件頁數(shù)： 24/41頁
文件大?。?/td> 1149K
代理商： TPS5401DGQT
P1
C
P
1
f
2
R
C
p
=
CO
OUT
C
PS
ref
EA
2
f
C
V
R
=
×
gm
V
gm
p
C
Pmod
1
C
=
2
f
p
P
Zmod
1
C
=
2
f
p
V = 20 V / div
IN
V
= 2 V / div
OUT
EN = 2 V / div
Time = 5 msec / div
V
= 50 mV / div (ac coupled)
OUT
I
= 200 mA / div
OUT
Time = 200 sec / div
SLVSAB0 – DECEMBER 2010
www.ti.com
And, the mid-frequency pole is given by Equation 32.
(32)
The first step is to choose the closed-loop crossover frequency fCO. In general, the closed-loop crossover
frequency could be less than 1/10 of the minimum operating frequency. But for the TPS5401, it is recommended
that the maximum closed-loop crossover frequency be not greater than 40 kHz. For this example, we choose
15-kHz crossover frequency. Next, by definition, the magnitude of the loop gain at the crossover frequency is 0
dB. By placing the compensation zero at the power stage pole, and the mid-compensation pole at the power
stage zero, the RC, CC and CP can be approximately calculated by Equation 33 through Equation 35.
(33)
(34)
(35)
Where:
gmPS is the power-stage transconductance. It is 1.9 A/V
gmEA is the error-amplifier transconductance. It is 97 mA/V
For this design example, R4, C7, and C8 make the compensation network. R4 = 698 k
Ω, C7 = 3300 pF, C8 = 82
pF.
Discontinuous Mode and Eco-mode Control-Scheme Boundary
With an input voltage of 34 V, the power supply enters discontinuous mode when the output current is less than
50 mA. The power supply enters Eco-mode control scheme when the output current is lower than 30 mA.
Application Curves
Figure 42. Load Transient (100 mA to 350 mA)
Figure 43. Start-Up With Input Voltage
30
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS5401
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