- 您現在的位置：買賣IC網 > PDF目錄98285 > TPS65257RHAT (TEXAS INSTRUMENTS INC) 4 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PQCC40 PDF資料下載
參數資料
| 型號： | TPS65257RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, VQFN-40 |
| 文件頁數： | 15/34頁 |
| 文件大小： | 2100K |
| 代理商： | TPS65257RHAT |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁當前第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁
2
C
M
ps
fc Vo Co
R
g
Vref gm
p ×
×
=
×
2
C
M
ps
fc Vo Co
R
g
Vref 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
=
×
SLVSB32
– SEPTEMBER 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 around 500 kHz
Use type III circuit for switching
yield best trade off between performance and cost. When
frequencies higher than 500 kHz.
using smaller L and C, switching frequency can be
increased. To optimize efficiency, switching frequency can
be lowered.
Select cross over frequency (fc) to be at least 1/5 to 1/10 of
Suggested
switching frequency (fs).
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 CMP 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 equivalent
soft-start 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 both buck converters
’ outputs are more than
90% of its nominal output voltage.
The default reset time is 100 ms. The polarity of the PGOOD is active high.
Current Limit Protection
The TPS65257 current limit trip is set by the following formulae:
22
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS65257
相關PDF資料 |
PDF描述 |
|---|---|
| TPS65510RGTRG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| TPS65510RGTTG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| TPS65530ARSLR | 0.6 A BATTERY CHARGE CONTROLLER, 1650 kHz SWITCHING FREQ-MAX, PQCC48 |
| TPS65530ARSLT | 0.6 A BATTERY CHARGE CONTROLLER, 1650 kHz SWITCHING FREQ-MAX, PQCC48 |
| TPS65530RSLRG4 | 3.3 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PQCC48 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS65258EVM | 功能描述:電源管理IC開發工具 TPS65258 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 |
| TPS65258RHAR | 功能描述:PMIC 解決方案 3 DC-DC CONVERTERS RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65258RHAT | 功能描述:PMIC 解決方案 3 DC-DC CONVERTERS RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65261-1RHBR | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.6V 3 Output 3A, 2A 32-VFQFN Exposed Pad 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態:有效 功能:降壓 輸出配置:正 拓撲:降壓 輸出類型:可調式 輸出數:3 電壓 - 輸入（最小值）:4.5V 電壓 - 輸入（最大值）:18V 電壓 - 輸出（最小值/固定）:0.6V 電壓 - 輸出（最大值）:18V 電流 - 輸出:3A，2A 頻率 - 開關:250kHz ~ 2MHz 同步整流器:是 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:32-VFQFN 裸露焊盤 供應商器件封裝:32-VQFN（5x5） 標準包裝:1 |
| TPS65261-1RHBT | 功能描述:IC REG BCK ADJ 3A/2A TRPL 32VQFN 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態:在售 功能:降壓 輸出配置:正 拓撲:降壓 輸出類型:可調式 輸出數:3 電壓 - 輸入（最小值）:4.5V 電壓 - 輸入（最大值）:18V 電壓 - 輸出（最小值/固定）:0.6V 電壓 - 輸出（最大值）:18V 電流 - 輸出:3A，2A 頻率 - 開關:250kHz ~ 2MHz 同步整流器:是 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:32-VFQFN 裸露焊盤 供應商器件封裝:32-VQFN（5x5） 標準包裝:1 |
發布緊急采購，3分鐘左右您將得到回復。