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| 型號(hào)： | TPS40090QPWRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | GREEN, PLASTIC, TSSOP-24 |
| 文件頁數(shù)： | 10/23頁 |
| 文件大小： | 309K |
| 代理商： | TPS40090QPWRQ1 |
R
L
DCR
C
R2
R1
RNTC
RTHE
R
E +
L
DCR
C
R
THE1 +
R
THE(T1)
R
THE(25)
R
THE2 +
R
THE(T2)
R
THE(25)
R
T +
K
DIV(T)
1 * KDIV(T)
R
K
DIV(T) +
K
DIV(25)
1 ) 0.0039
(t * 25)
SLUS845C
– JUNE 2008 – REVISED MAY 2011
Figure 11.
Figure 12.
The following algorithm and expressions help to determine components of the network.
1. Calculate the equivalent impedance of the network at 25
°C that matches the inductor parameters in
Equation 18. Use of COG type capacitors for this application is recommended. For example, for L = 0.4
μH,
DCR = 1.22 m
, C = 10 nF; RE = 33.3 k. It is recommended to keep RE < 50 k as higher values may
produce false triggering of the current sense fault protection.
(18)
2. It is necessary to set the network attenuation value KDIV(25) at 25°C. For example, KDIV(25) = 0.85. The
attenuation values KDIV(25) > 0.9 produces higher values for NTC resistors that are harder to get from
suppliers. Attenuation values lower 0.7 substantially reduce the network output signal.
3. Based on calculated RE and KDIV(25) values, calculate and pick the closest standard value for the resistor R
= RE/KDIV(25). For the given example R = 33 k/ 0.85 = 38.8 k. The closest standard value from 1% line is
R = 39.2 k
.
4. Pick two temperature values at which curve fitting is made. For example T1 = 50
°C and T2 = 90°C.
5. Find the relative values of RTHE required on each of these temperatures.
(19)
(20)
For the given example RTHE1= 0.606, RTHE2=0.372.
18
Copyright
2008–2011, Texas Instruments Incorporated
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| TPS40090RHDR | 功能描述:DC/DC 開關(guān)控制器 4 Ch Multiph Buck DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40090RHDRG4 | 功能描述:DC/DC 開關(guān)控制器 4Ch Multiphase Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40090RHDT | 功能描述:DC/DC 開關(guān)控制器 4Ch Multiphase Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40090RHDTG4 | 功能描述:DC/DC 開關(guān)控制器 4Ch Multiphase Buck DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40091 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH FREQUENCY MULTIPHASE CONTROLLER |
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