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| 型号： | TPS650243RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 13/35页 |
| 文件大小： | 955K |
| 代理商： | TPS650243RHBR |
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PWRFAIL
DESIGN PROCEDURE
Inductor Selection for the dcdc Converters
DIL + Vout
1 *
Vout
Vin
L
I
Lmax + Ioutmax )
DIL
2
(4)
SLVS774B – JUNE 2007 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com
Table 1. Control Pins for DCDC Converters (continued)
INPUT/
PIN NAME
FUNCTION
OUTPUT
EN_DCDC3
I
Set EN_DCDC3 = 0 to disable or EN_DCDC3 = 1 to enable the VDCDC3 converter
EN_DCDC2
I
Set EN_DCDC2 = 0 to disable or EN_DCDC2 = 1 to enable the VDCDC2 converter
EN_DCDC1
I
Set EN_DCDC1 = 0 to disable or EN_DCDC1 = 1 to enable the VDCDC1 converter
The PWRFAIL signal is generated by a voltage detector at the PWRFAIL_SNS input. The input signal is
compared to a 1V threshold (falling edge) with 5% (50mV) hysteresis. PWRFAIL is an open drain output which is
actively low when the input voltage at PWRFAIL_SNS is below the threshold.
The three converters operate with 2.2uH output inductors. Larger or smaller inductor values can be used to
optimize performance of the device for specific conditions. The selected inductor has to be rated for its dc
resistance and saturation current. The dc resistance of the inductor influences directly the efficiency of the
converter. Therefore, an inductor with the lowest dc resistance should be selected for the highest efficiency.
For a fast transient response, a 2.2
H inductor in combination with a 22F output capacitor is recommended. For
an output voltage above 2.8V, an inductor value of 3.3
H minimum is required. Lower values result in an
increased output voltage ripple in PFM mode. The minimum inductor value is 1.5
H, but an output capacitor of
22
F minimum is needed in this case.
Equation 4 calculates the maximum inductor current under static load conditions. The saturation current of the
inductor should be rated higher than the maximum inductor current as calculated with Equation 4. This is
recommended because during heavy load transient the inductor current rises above the calculated value.
With:
f = Switching frequency (2.25 MHz typical)
L = Inductor value
ΔIL = Peak-to-peak inductor ripple current
ILmax = Maximum inductor current
The highest inductor current occurs at maximum Vin.
Open core inductors have a soft saturation characteristic and they can usually handle higher inductor currents
versus a comparable shielded inductor.
A more conservative approach is to select the inductor current rating just for the maximum switch current of the
corresponding converter. Consideration must be given to the difference in the core material from inductor to
inductor which has an impact on efficiency especially at high switching frequencies. See Table 2 and the typical
applications for possible inductors.
Table 2. Tested Inductors
INDUCTOR
COMPONENT
DEVICE
TYPE
VALUE
SUPPLIER
3.3
H
LPS3015-332 (output current up to 1A)
Coilcraft
2.2
H
LPS3015-222 (output current up to 1A)
Coilcraft
3.3
H
VLCF4020T-3R3N1R5
TDK
2.2
H
VLCF4020T-2R2N1R7
TDK
20
Copyright 2007–2009, Texas Instruments Incorporated
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| TPS650243RHBRG4 | 功能描述:电池管理 Pwr Mgmt ICs for Li Ion Pwred Systems RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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| TPS650243RHBT | 制造商:Texas Instruments 功能描述:3 Buck and 3 LDO - 制造商:Texas Instruments 功能描述:IC, POWER MANAGEMENT, QFN-32 |
| TPS650243RHBTG4 | 功能描述:电池管理 Pwr Mgmt ICs for Li Ion Pwred Systems RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| TPS650244IRHBRQ1 | 功能描述:电池管理 AC 6Ch Pwr Mgmt Unit RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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