- 您现在的位置：买卖IC网 > PDF目录98285 > TPS65171RHAR (TEXAS INSTRUMENTS INC) 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 PDF资料下载
参数资料
| 型号： | TPS65171RHAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40 |
| 文件页数： | 18/46页 |
| 文件大小： | 3644K |
| 代理商： | TPS65171RHAR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页
logic
FB2
R5
V
= V
1+
= 1.24 V
1+
R6
÷
÷
è
è
FB2
V
1.24 V
R6 =
=
1.2 k
1mA
1 mA
W
logic
FB2
V
R5 = R6
1 = R6
1
V
1.24 V
-
-
÷
÷
÷
÷
è
è
www.ti.com
SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
Usually a Schottky diode with a 1A maximum average rectified forward current rating is sufficient for most
applications. The Schottky rectifier can be selected with lower forward current capability depending on the output
current Iout, but has to be able to dissipate the power. The dissipated power is the average rectified forward
current times the diode forward voltage. The efficiency rises with lower forward voltage.
PD = Iavg × Vforward
(17)
Table 7. Rectifier Diode Selection (Buck Converter)
Vr/Iavg
Vforward
RqJA
SIZE
COMPONENT SUPPLIER
20V/1A
0.46V at 1A
20°C/W
SMA
B120, DIODES Incorporated
20V/0.5A
0.44V at 0.5A
150°C/W
SOT123
MBR0520, International Rectifier
20V/1A
0.32V at 1A
60°C/W
PowerDI 123
DFLS120L, DIODES Incorporated
Output Capacitor Selection (Buck Converter)
For best output voltage filtering, low ESR ceramic output capacitors are recommended. Two 22mF or four 10mF
ceramic output capacitors with sufficient voltage rating in parallel are adequate for most applications. Additional
capacitors can be added to improve the load transient regulation. See Table 8 for output capacitor selection.
Table 8. Output Capacitor Selection (Buck Converter)
CAPACITOR
COMPONENT SUPPLIER
22mF/6.3V
Murata, GRM31CR60J226KE19
10mF/6.3V
Murata, GRM21BR70J106KE76
47mF/6.3V
Murata, GRM32ER60J476ME20
10mF/6.3V
Taiyo Yuden, JWK212BJ106MD
Setting the Output Voltage (Buck Converter)
The output voltage is set by an external resistor divider. R6 should be chosen in the range of 0.5k
to 4.7k. For
good noise covering and accuracy the lower feedback resistor R6 is selected to obtain at least a 250mA minimum
load current.
(18)
(19)
(20)
Negative Buck-Boost Converter VOFFE, Temperature Compensation
The non-synchronous constant off-time current mode buck-boost converter generates the negative VOFFE voltage
rail. This output rail is required to power the scan driver. The output voltage is temperature compensated and
fully adjustable from –22V to –5V. The external resistor divider on pins FB5 and SET allow programming high
and low voltage levels. The graph below shows the output voltage versus temperature in °C and series resistor
R19 (5k
to 7.5k). NTC (22k) and R18 (30k) define the slope of the curve, R19 allows selection of the
temperature point where temperature compensation begins and ends. The converter is compensated internally,
for further stabilization the feed-forward capacitor C22 can be chosen between 100pF and 3nF. Soft-start is also
realized with this capacitor. The larger the capacitor value the longer the soft-start time. The recommended C22
value is 2.2nF.
Copyright 2009–2010, Texas Instruments Incorporated
25
Product Folder Link(s): TPS65171
相关PDF资料 |
PDF描述 |
|---|---|
| TPS65182BRGZT | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65182RGZT | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65182RGZR | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65185RSLT | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65200YFFR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA36 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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:- 包装:剪切带（CT） 零件状态:有效 应用:LCD 电视机/监控器 电流 - 电源:- 电压 - 电源:8.6 V ~ 14.7 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商器件封装:56-VQFN（7x7） 标准包装:1 |
| TPS65175RSHR | 功能描述:LCD 驱动器 Fully Programmable LCD Bias IC RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65176RHDR | 功能描述:其他电源管理 LCD BIAS IC FOR TV RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| TPS65176RHDT | 功能描述:其他电源管理 LCD BIAS IC FOR TV RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。