收藏本站
参数资料
型号： TPS65073TRSLRQ1
厂商： TEXAS INSTRUMENTS INC
元件分类： 电源管理
英文描述： POWER SUPPLY SUPPORT CKT, PQCC48
封装： 6 X 6 MM, 0.4 MM PITCH, PLASTIC, QFN-48
文件页数： 63/90页
文件大小： 1375K
代理商： TPS65073TRSLRQ1
Vo + V
Vin
D =
Vo + V
Vsw
-
(on)
AVG
Io
Vsw = Rds
I
Iavg =
1
D
-
V i
D
1
Vo + V
- h
÷
è
2.8 V
D
1
0.8
89%
19.2 V + 0.5 V
-
÷
è
(on)
AVG
(on)
Io
25 mA
Vsw = Rds
I
= Rds
= 0.6
140 mV
1
D
1
0.89
W
-
L
(Vin
Vsw)
dt
(2.8V
0.14V)
792 ns
V
dt
di =
=
= 117 mA
L
18
H
-
-
m
Io
25 mA
Iavg =
=
= 227 mA
1
D
1
0.89
-
117 mA
Imax = 227 mA +
= 285 m A
2
117 mA
Imin = 227 m A
= 169 mA
2
-
TPS65070-Q1, TPS65072-Q1, TPS65073-Q1, TPS650732-Q1
SLVSAP7 – JANUARY 2011
www.ti.com
The duty cycle for a boost converter is:
(10)
With:
(11)
A different approach to calculate the duty cycle is based on the efficiency of the converter. The typical number
can be found in the graphs, or as a first approach, we can assume to get an efficiency of about 80% as a typical
value.
(12)
With the values given above
(13)
ton = T × D = 890 ns × 0.89 = 792 ns
toff = 890 ns – 792 ns = 98ns
(14)
When the NMOS switch is turned on, the input voltage is forcing a current into the inductor. The current slope
can be calculated with:
(15)
(16)
The minimum and maximum inductor current can be found by adding half of the inductor current ripple (di) to the
average value, which gives:
(17)
Given the values above, an inductor with a current rating greater than 290mA is needed. Plenty of margin should
be kept to the rating in the inductor vendors data sheets as the maximum current is typically specified at a
inductance drop of 20% or even 30%. A list of tested inductors is given in Table 6 with the test conditions as
mentioned below.
Test conditions:
Vin = 2.8V
Vf = 3.2V (per LED)
Vf = 0.5V (Schottky diode)
Iout = 25mA per string; no dimming
Table 6. Tested Inductors
LED CONFIGURATION
INDUCTOR TYPE
INDUCTOR VALUE
SUPPLIER
1 × 6LEDs
LPS3015
18 mH
Coilcraft
2 × 6LEDs
LPS4018
47 mH
Coilcraft
1 × 10LEDs
LPS4018
47 mH
Coilcraft
66
Submit Documentation Feedback
Copyright 2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS65070-Q1 TPS65072-Q1 TPS65073-Q1 TPS650732-Q1
相关PDF资料
PDF描述
TC151A4924EOA713 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
TC161B3514EOA723 0.25 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDSO8
TC161B1717EOA713 0.25 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDSO8
TC161A5520EOA713 0.25 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDSO8
TC161A5825EOA713 0.25 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDSO8
相关代理商/技术参数
参数描述
TPS650830EVM-095 功能描述:TPS650830 - Power Management, Special Purpose: Mobiles Evaluation Board 制造商:texas instruments 系列:- 零件状态:有效 主要用途:电源管理，专用型： 手机 嵌入式:- 使用的 IC/零件:TPS650830 主要属性:- 辅助属性:图形用户接口，I2C 接口 所含物品:板 标准包装:1
TPS650830ZAJT 功能描述:- Converter, Mobile PCs Voltage Regulator IC 8 Output 168-NFBGA (7x7) 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 应用:转换器，移动式个人电脑 电压 - 输入:5.4 V ~ 24 V 输出数:8 电压 - 输出:多重 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:168-TFBGA 供应商器件封装:168-NFBGA（7x7） 标准包装:1
TPS650830ZCGT 功能描述:- Converter, Mobile PCs Voltage Regulator IC 8 Output 159-NFBGA (9x9) 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 应用:转换器，移动式个人电脑 电压 - 输入:5.4 V ~ 24 V 输出数:8 电压 - 输出:多重 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:159-TFBGA 供应商器件封装:159-NFBGA(9x9) 标准包装:1
TPS650860A0RSKT 功能描述:D-CAP2? Controller, Multicore, CPU, FPGA, SOC’s Voltage Regulator IC 8 Output 64-QFN (8x8) 制造商:texas instruments 系列:D-CAP2?? 包装:剪切带（CT） 零件状态:有效 应用:控制器，多核，CPU，FPGA，SOC 应用 电压 - 输入:4.5 V ~ 21 V 输出数:8 电压 - 输出:多重 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:64-VFQFN 裸露焊盘 供应商器件封装:64-QFN（8x8） 标准包装:1
TPS650860EVM-116 功能描述:EVALUATION MODULE 制造商:texas instruments 系列:* 零件状态:在售 标准包装:1
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*