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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： | 9/29页 |
| 文件大小： | 1210K |
| 代理商： | TPS75003MRHLREP |
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OUT
(diode)(RMS)
OUT
IN
V
I
(1
D) = I
1
V
-
÷
è
1.1
PP
1
V
=
I
ES R +
I
ES R
8
COUT
f
é
ù
D
D
D
÷
ê
ú
è
(
)
2
O UT
OU T
IN
OU T
L
I
C
=
V
-
SGLS311A
– DECEMBER 2006 – REVISED MARCH 2011
Diode Selection (Buck Controllers)
The diode is off when the PMOS is on, and on when the PMOS is off. Since it will be turned on and off at a
relatively high frequency, a Schottky diode is recommended for good performance. The peak current rating of the
diode should exceed the peak current limit set by the sense resistor RIS1,2. A diode with low reverse leakage
current and low forward voltage at operating current will optimize efficiency. Equation 10 calculates the estimated
average power dissipation.
(10)
Output Capacitor Selection (Buck Controllers)
The output capacitor is selected based on output voltage ripple and transient response requirements. As a result
of the nature of the hysteretic control loop, a minimum ESR of a few tens of m
should be maintained for good
operation unless a feed-forward resistor is used. Low ESR bulk tantalum or PosCap capacitors work best in most
applications. A 1-
μF ceramic capacitor can be used in parallel with this capacitor to filter higher frequency spikes.
The output voltage ripple can be estimated by Equation 11.
(11)
To calculate the capacitance needed to achieve a given voltage ripple as a result of a load transient from zero
output to full current, use Equation 12.
(12)
If only ceramic or other very low ESR output capacitor configurations are desired, additional voltage ripple must
be passed to the feedback pin. See Application Note, Using Ceramic Output Capacitors with the TPS6420x Buck
Controllers (SLVA210), for detailed application information.
Output Voltage Ripple Effect on VOUT (Buck Controllers)
Output voltage ripple causes VOUT to be higher or lower than the target value by half of the peak-to-peak voltage
ripple. For minimum on-time, the ripple adds to the voltage; for minimum off-time, it subtracts from the voltage.
Soft-Start Capacitor Selection (Buck Controllers)
BUCK1 is discussed in this section; it is identical to BUCK2. Soft-start is implemented on the buck controllers by
ramping current limit from 0 to its target value (set by R1) over a user-defined time. This time is set by the
external soft-start cap connected to pin SS1. If SS1 is left open, a small on-chip capacitor will provide a current
limit ramp time of approximately 250
μs. Figure 25 shows the effects of R1 and SS1 on the current limit start-up
ramp.
Copyright
2006–2011, Texas Instruments Incorporated
17
Product Folder Link(s): TPS75003-EP
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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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