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| 型号： | TPS75003MRHLREP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封装： | 4.50 X 3.50 MM, 0.90 MM HEIGHT, PLASTIC, QFN-20 |
| 文件页数： | 8/29页 |
| 文件大小： | 1210K |
| 代理商： | TPS75003MRHLREP |
第1页第2页第3页第4页第5页第6页第7页当前第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
(
)
(OFF,min)
OUT
SCHO TTKY
L
O UT
IN
OUT
DS(on)
L
OUT
ON
t
V
+ V
+ R
I
V
IOUT
r
R
I
t
,MIN
-
-
(
)
IN
OUT
DS(on)
L
OUT
ON
MIN
V
I
r
R
I
t
,MIN
L
=
I
-
-
D
(
)
O UT
S CHOTTKY
L
OUT
OFF
MIN
V
+ V
+ R
I
t
,MIN
L
=
I
D
OUT
PMOS(RMS)
OUT
IN
V
I
D = I
V
(
)
[
]
(
)
(
)
2
(cond)
OUT
DS(on)
J
OUT
DS(on)
P
= I
r
1 + TC
T
25 C
I
D
r
-
°
D
SGLS311A
– DECEMBER 2006 – REVISED MARCH 2011
Inductor Value Selection (Buck Controllers)
The inductor is chosen based on inductance value and maximum current rating. Larger inductors reduce current
ripple (and therefore, output voltage ripple) but are physically larger and more expensive. Inductors with lower
DC resistance typically improve efficiency, but also have higher cost and larger physical size. The buck
converters work well with inductor values between 4.7
μH and 47 μH in most applications. When selecting an
inductor, the current rating should exceed the current limit set by RIS or RDS,ON (see Current Limit section). To
determine the minimum inductor size, first determine if the device will operate in minimum on-time or minimum
off-time mode. The device will operate in minimum on-time mode if Equation 5 is satisfied.
(5)
where RL = the inductor's DC resistance.
Minimum inductor size needed when operating in minimum on-time mode is given by Equation 6.
(6)
Minimum inductor size needed when operating in minimum off-time mode is given by Equation 7.
(7)
External PMOS Transistor Selection (Buck Controllers)
The external PMOS transistor is selected based on threshold voltage (VT), on-resistance (RDS,ON), gate
capacitance (CG) and voltage rating. The PMOS VT magnitude must be much lower than the lowest voltage at
IN1 or IN2 that will be used. A VT magnitude that is 0.5 V less than the lowest input voltage is normally sufficient.
The PMOS gate will see voltages from 0 V to the maximum input voltage, so gate-to-source breakdown should
be a few volts higher than the maximum input supply. The drain-to-source of the device will also see this full
voltage swing, and should therefore be a few volts higher than the maximum input supply. The RMS current in
the PMOS can be estimated by using Equation 8.
(8)
The power dissipated in the PMOS is comprised of both conduction and switching losses. Switching losses are
typically insignificant. The conduction losses are a function of the RMS current and the RDS,ON of the PMOS, and
are calculated by Equation 9.
(9)
16
Copyright
2006–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS75003-EP
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相关代理商/技术参数 |
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|---|---|
| TPS75003QRHLREP | 功能描述:IC PWR MGMT TRIPLE-SUPPLY 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| TPS75003RHLR | 功能描述:PMIC 解决方案 Integ 3-Supply Power Mngmnt IC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| TPS75003RHLR | 制造商:Texas Instruments 功能描述:LEADED PROCESS COMPATIBLE ((NW)) 制造商:Texas Instruments 功能描述:IC, POWER MANAGEMENT, QFN-20 |
| TPS75003RHLRG4 | 功能描述:PMIC 解决方案 Integ 3-Supply Power Mngmnt IC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| TPS75003RHLT | 功能描述:PMIC 解决方案 Integ 3-Supply Power Mngmnt IC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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