- 您现在的位置：买卖IC网 > PDF目录98281 > TPS40070PWPRG4 (TEXAS INSTRUMENTS INC) 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 PDF资料下载
参数资料
| 型号： | TPS40070PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 9/28页 |
| 文件大小： | 655K |
| 代理商： | TPS40070PWPRG4 |
第1页第2页第3页第4页第5页第6页第7页第8页当前第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
P
T +
2
P
D
V
DR
) IQ
V
IN
(Watts)
(16)
P
T + 2
Qg
f
SW ) IQ
V
IN
(Watts)
(17)
qJA + 36.51OC W
(18)
P
T +
T
J * TA
qJA
(Watts)
(19)
f
SW +
T
J*TA
qJA VDD
* IQ
2
Qg
(Hz)
(20)
BOOST DIODE
LOW VOLTAGE OPERATION
GROUNDING AND BOARD LAYOUT
www.ti.com .................................................................................................................................................. SLUS582J – DECEMBER 2003 – REVISED APRIL 2009
And the total power dissipation in the TPS4007x, assuming the same MOSFET is selected for both the high-side
and synchronous rectifier is described in Equation 16.
or
where:
I
Q is the quiescent operating current (neglecting drivers)
The maximum power capability of the TPS4007x PowerPAD package is dependent on the layout as well as air
flow. The thermal impedance from junction to air assuming 2-oz. copper trace and thermal pad with solder and
no air flow is see teh application report titledPowerPAD Thermally Enhanced Package (SLMA002) for detailed
information on PowerPAD package mounting and usage.
The maximum allowable package power dissipation is related to ambient temperature by Equation 19.
Substituting Equation 19 into Equation 18 and solving for fSW yields the maximum operating frequency for the
TPS4007x. The result is described in Equation 20.
The TPS4007x series has internal diodes to charge the boost capacitor connected from SW to BOOST. The drop
across this diode is rather large at 1.4-V nominal at room temperature. If this drop is too large for a particular
application, an external diode may be connected from DBP (anode) to BOOST (cathode). This provides
significantly improved gate drive for the high side FET, especially at lower input voltages.
If the programmable UVLO is set to less than 6.5 V nominal, connect a 330-k
resistor across the soft-start
capacitor. This eliminates a race condition inside the device that can lead to an output voltage overshoot on
power down of the part. If operation is expected below -10°C ambient temperature and at less than 5-V input, it
is recommended that a diode be connected from LVBP to DBP. (See Figure 16).
The TPS4007x provides separate signal ground (SGND) and power ground (PGND) pins. Care should be given
to proper separation of the circuit grounds. Each ground should consist of a plane to minimize its impedance if
possible. The high power noisy circuits such as the output, synchronous rectifier, MOSFET driver decoupling
capacitor (DBP), and the input capacitor should be connected to PGND plane.
Sensitive nodes such as the FB resistor divider and RT should be connected to the SGND plane. The SGND
plane should only make a single point connection to the PGND plane. It is suggested that the SGND pin be tied
to the copper area for the PowerPAD underneath the chip. Tie the PGND to the PowerPAD copper area as well
and make the connection to the power circuit ground from the PGND pin. Reference the output voltage divider to
the SGND pin.
Copyright 2003–2009, Texas Instruments Incorporated
17
相关PDF资料 |
PDF描述 |
|---|---|
| TPS40071PWPR | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| TPS40070PWPR | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| TPS40074RHLT | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20 |
| TPS40074RHLRG4 | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20 |
| TPS40074RHL | 2 A SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PQCC20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40071 | 制造商:TI 制造商全称:Texas Instruments 功能描述:HIGH-EFFICIANCY MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD |
| TPS40071EVM-001 | 功能描述:EVAL MODULE FOR TPS40071-001 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:Predictive Gate Drive™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| TPS40071PWP | 功能描述:DC/DC 开关控制器 Mid Rg In Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40071PWPG4 | 功能描述:DC/DC 开关控制器 Mid Rg In Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40071PWPR | 功能描述:DC/DC 开关控制器 Mid Rg In Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
发布紧急采购，3分钟左右您将得到回复。