- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98285 > TPS65170RHDT (TEXAS INSTRUMENTS INC) 4.2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC28 PDF資料下載
參數(shù)資料
| 型號： | TPS65170RHDT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-28 |
| 文件頁數(shù)： | 10/35頁 |
| 文件大?。?/td> | 4698K |
| 代理商： | TPS65170RHDT |
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頁當(dāng)前第10頁第11頁第12頁第13頁第14頁第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頁第35頁
GL
LOGIC(EFFECTIVE)
LOGIC
V
I
= I
+
V
LOGIC
IN
V
D =
V
η
(
)
IN
LOGIC(EFFECTIVE)
SW(LIM)
SW
V
1
D
I
= I
D
2
L
-
(
)
IN
SW(PK)
LOGIC(EFFECTIVE)
SW
V
1
D
I
= I
+
D
2
L
-
SLVSA27 – OCTOBER 2009
www.ti.com
An internal pull-up prevents the buck converter from generating excessive output voltages if its FBB pin is left
floating.
Buck Converter Design Procedure
Because the negative charge pump is driven from the buck converter's switch node, the effective output current
for design purposes is greater than ILOGIC alone. For best performance, the effective current calculated using
Equation 11 should be used during the design.
(11)
Calculate Converter Duty Cycle (Buck Converter)
The best way to calculate the converter's duty cycle is to use the efficiency curve in Figure 7 to determine the
converter's efficiency under the anticipated load conditions and insert this value into Equation 12 (1). Alternatively,
a worst-case value (e.g., 80%) can be used for efficiency.
(12)
(1)
Valid only when buck converter perates in CCM.
Calculate Maximum Output Current (Buck Converter)
The maximum output current that the buck converter can supply can be calculated using Equation 13. The
minimum specified output current occurs at the minimum duty cycle (which occurs at maximum VIN) and
maximum frequency (900kHz).
(13)
Where ISW(LIM) is the minimum specified switch current limit (1.5A) and SW is the converter switching frequency.
Calculate Peak Switch Current (Buck Converter)
Equation 14 can be used to calculate the peak switch current occurring in a given application. The worst-case
(maximum) peak current occurs at maximum VIN.
(14)
Inductor Selection (Buck Converter)
The buck converter is designed for use with inductors in the range 6.8H to 15H, and is optimized for 10H.
The inductor must be capable of supporting the peak current calculated by Equation 14 without saturating.
Alternatively, a more conservative approach can be used in which an inductor is selected whose saturation
current is greater than the maximum switch current limit (2.25A).
Another important parameter is DC resistance, which can significantly affect the overall converter efficiency.
Physically larger inductors tend to have lower DC resistance (DCR) because they can use thicker wire. The type
and core material of the inductor can also affect efficiency, sometimes by as much as 10%. Table 4 shows some
suitable inductors.
Table 4. Buck Converter Inductor Selection
PART NUMBER
INDUCTOR VALUE
COMPONENT SUPPLIER
SIZE (L×W×H mm)
ISAT / DCR
CDRH8D43
10 H
Sumida
8.3 × 8.3 × 4.5
4A / 29 m
Ω
CDRH8D38
10 H
Sumida
8.3 × 8.3 × 4
3A / 38 m
Ω
MSS 1048-103
10 H
Coilcraft
10.5 × 10.5 × 5.1
4.8A / 26 m
Ω
744066100
10 H
Wuerth
10 × 10 × 3.8
4A / 28 m
Ω
18
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS65170
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS65171RHAR | 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| TPS65182BRGZT | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65182RGZT | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65182RGZR | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65185RSLT | POWER SUPPLY SUPPORT CKT, PQCC48 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS65171RHAR | 功能描述:LCD 驅(qū)動器 Compact LCD Bias RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65175ARSHR | 制造商:Texas Instruments 功能描述:LCD BIAS CHIP AND LEVEL SHIFTE 制造商:Texas Instruments 功能描述:IC BIAS PWR SUPP FOR LCD 56VQFN 制造商:Texas Instruments 功能描述:Fully Programmable LCD Bias IC |
| TPS65175CRSHR | 功能描述:LCD TV/Monitor PMIC 56-VQFN (7x7) 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 應(yīng)用:LCD 電視機(jī)/監(jiān)控器 電流 - 電源:- 電壓 - 電源:8.6 V ~ 14.7 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應(yīng)商器件封裝:56-VQFN（7x7） 標(biāo)準(zhǔn)包裝:1 |
| TPS65175RSHR | 功能描述:LCD 驅(qū)動器 Fully Programmable LCD Bias IC RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65176RHDR | 功能描述:其他電源管理 LCD BIAS IC FOR TV RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。