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參數資料
| 型號： | TPS65251RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, VQFN-40 |
| 文件頁數： | 9/31頁 |
| 文件大小： | 1827K |
| 代理商： | TPS65251RHAT |
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2
C
M
ps
fc Vo Co
R
g
Vref gm
p ×
×
=
×
2
C
M
ps
fc Co
R
g
gm
p ×
×
=
×
L
c
R
Co
C
R
×
=
L
c
R
Co
C
R
×
=
1
2
O
L
fp
C
R
p
=
×
Re
Roll
C
sr Co
C
R
×
=
Re
Roll
C
sr Co
C
R
×
=
1
2
Roll
C
Roll
fp
R
C
p
=
×
1
2
ff
C
fz
R
p
=
×
www.ti.com
SLVSAA4B – JUNE 2010 – REVISED JANUARY 2011
To calculate the external compensation components follow the following steps:
TYPE II CIRCUIT
TYPE III CIRCUIT
Select switching frequency that is appropriate for
application depending on L, C sizes, output ripple, EMI
concerns and etc. Switching frequencies between 500 kHz
Use type III circuit for switching
and 1 MHz give best trade off between performance and
frequencies higher than 500 kHz.
cost. When using smaller L and Cs, switching frequency
can be increased. To optimize efficiency, switching
frequency can be lowered.
Select cross over frequency (fc) to be less than 1/5 to 1/10
Suggested
of switching frequency.
fc = fs/10
Set and calculate Rc.
Calculate Cc by placing a compensation zero at or before
the converter dominant pole
Add CRoll if needed to remove large signal coupling to high
impedance COMP node. Make sure that
is at least twice the cross over frequency.
Calculate Cff compensation zero at low frequency to boost
the phase margin at the crossover frequency. Make sure
NA
that the zero frequency (fzff is smaller than soft start
equivalent frequency (1/Tss).
Slope Compensation
The device has a built-in slope compensation ramp. The slope compensation can prevent sub harmonic
oscillations in peak current mode control.
Power Good
The PGOOD pin is an open drain output. The PGOOD pin is pulled low when any buck converter is pulled below
85% of the nominal output voltage. The PGOOD is pulled up when all three buck converters’ outputs are more
than 90% of its nominal output voltage and reset time of 1 second elapses. The polarity of the PGOOD is active
high.
Copyright 2010–2011, Texas Instruments Incorporated
17
Product Folder Link(s): TPS65251
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS65252EVM | 功能描述:電源管理IC開發工具 TPS65252 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS65252RHDR | 功能描述:PMIC 解決方案 4.5-16V Inp w/ 2 BUCK CONVERTER RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65252RHDT | 功能描述:PMIC 解決方案 4.5-16V Inp w/ 2 BUCK CONVERTER RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65253EVM | 功能描述:電源管理IC開發工具 TPS65253 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS65253RHDR | 功能描述:PMIC 解決方案 4.5V-16Vin/2 Buck Converters RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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