- 您现在的位置：买卖IC网 > PDF目录199467 > TPS65148RHBR (TEXAS INSTRUMENTS INC) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 PDF资料下载
参数资料
| 型号： | TPS65148RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 5/30页 |
| 文件大小： | 947K |
| 代理商： | TPS65148RHBR |
第1页第2页第3页第4页当前第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
=
F
OUT
I
18
1
70
=
=
-
÷
è
S
FB
V
R2
k
R1 R2
A
V
FB
R1
R2
V
S
www.ti.com
SLVS904A – MAY 2009 – REVISED JANUARY 2011
Rectifier Diode Selection
To achieve high efficiency a Schottky type should be used for the rectifier diode. The reverse voltage rating
should be higher than the maximum output voltage of the converter. The averaged rectified forward current IF,
the Schottky diode needs to be rated for, is equal to the output current IOUT:
(5)
Usually a Schottky diode with 2 A maximum average rectified forward current rating is sufficient for most of the
applications. Also, the Schottky rectifier has to be able to dissipate the power. The dissipated power is the
average rectified forward current times the diode forward voltage VF.
PD = IF × VF
Typically the diode should be able to dissipate around 500mW depending on the load current and forward
voltage.
Table 2. Rectifier Diode Selection
CURRENT
VR
VF / IF
COMPONENT SUPPLIER
COMPONENT CODE
PACKAGE TYPE
RATING lF
2 A
20 V
0.44 V/2 A
Vishay
SL22
SMA
2 A
20 V
0.5 V/2 A
Vishay
SS22
SMA
Setting the Output Voltage
The output voltage is set by an external resistor divider. Typically, a minimum current of 50 mA flowing through
the feedback divider is enough to cover the noise fluctuation. The resistors are then calculated with 70 A as:
with VFB = 1.240 V
(6)
Soft-Start (Boost Converter)
To minimize the inrush current during start-up an external capacitor connected to the soft-start pin SS is used to
slowly ramp up the internal current limit of the boost converter by charging it with a constant current of typically
10 A. The inductor peak current limit is directly dependent on the SS voltage and the maximum load current is
available after the soft-start is completed (VSS = 0.8 V) or VS has reached its Power Good value, 90% of its
nominal value. The larger the capacitor, the slower the ramp of the current limit and the longer the soft-start time.
A 100-nF capacitor is usually sufficient for most of the applications. When the EN pin is pulled low, the soft-start
capacitor is discharged to ground.
Frequency Select Pin (FREQ)
The digital frequency select pin FREQ allows to set the switching frequency of the device to 630 kHz (FREQ =
'low') or 1.2 MHz (FREQ = 'high'). A higher switching frequency improves the load transient response but
reduces slightly the efficiency. The other benefit of a higher switching frequency is a lower output voltage ripple.
Usually, it is recommended to use 1.2 MHz switching frequency unless light load efficiency is of major concern.
Compensation (COMP)
The regulation loop can be compensated by adjusting the external components connected to the COMP pin. The
COMP pin is the output of the internal transconductance error amplifier. The compensation capacitor will adjust
the low frequency gain and the resistor value will adjust the high frequency gain. Lower output voltages require a
higher gain and therefore a lower compensation capacitor value. A good start, that will work for the majority of
the applications is RCOMP = 47 k and CCOMP = 3.3 nF.
Copyright 2009–2011, Texas Instruments Incorporated
13
Product Folder Link(s) :TPS65148
相关PDF资料 |
PDF描述 |
|---|---|
| TPS65181RGZR | POWER SUPPLY MANAGEMENT CKT, PQCC48 |
| TPS721A | FIBER OPTIC PHOTODIODE DETECTOR, THROUGH HOLE MOUNT |
| TPS793285DBVRQ1 | 2.85 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO5 |
| TPSMA11A/5A | 400 W, UNIDIRECTIONAL, SILICON, TVS DIODE, DO-214AC |
| TPSMA15A/5A | 400 W, UNIDIRECTIONAL, SILICON, TVS DIODE, DO-214AC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS65148RHBT | 功能描述:LCD Gamma缓冲器 Compact TFT LCD Bias IC RoHS:否 制造商:Maxim Integrated 输入补偿电压: 转换速度: 电源电压-最大:20 V 电源电压-最小:9 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-38 封装:Tube |
| TPS65149RSHR | 功能描述:其他电源管理 LCD Bias Solution 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 |
| TPS65150 | 制造商:TI 功能描述:a very compact and small power supply solution that provides all three voltages required by thin film transistor (TFT) LCD displays |
| TPS65150EVM-697 | 功能描述:TPS65150 - Special Purpose DC/DC, LCD Supply 3, Non-Isolated Outputs Evaluation Board 制造商:texas instruments 系列:- 零件状态:有效 主要用途:特殊用途 DC/DC，LCD 电源 输出和类型:3，非隔离 功率 - 输出:- 电压 - 输出:15V，30V，-2V 电流 - 输出:- 电压 - 输入:1.8 V ~ 6 V 稳压器拓扑:升压 频率 - 开关:1.2MHz 板类型:完全填充 所含物品:板 使用的 IC/零件:TPS65150 标准包装:1 |
| TPS65150PWP | 功能描述:LCD 驱动器 Compact LCD Bias Supply 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 |
发布紧急采购，3分钟左右您将得到回复。