參數(shù)資料
型號(hào)： TPS51427ARHBT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, PQCC32
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁(yè)數(shù)： 27/42頁(yè)
文件大?。?/td> 2131K
代理商： TPS51427ARHBT
(
)
(
)
LOW ER _ DIV
VREF2
REFIN2
UPPER _ DIV
LOW ER _ DIV
R
V
R
÷
=
÷
+
è
UPPER _ DIV
LOW ER _ DIV
VOUT1
VFB1
LOW ER _ DIV
R
V
R
+
÷
=
÷
è
10
11
VOUT1
VFB1
R
UPPER_DIV
R
LOWER_DIV
TPS51427A
VBAT
UDG-08059
30
1
32
VOUT2
VREF2
REFIN2
R
UPPER_DIV
R
LOWER_DIV
TPS51427A
VBAT
UDG-08060
Ripple Requirement in PWM Mode, Skip Mode and OOA Mode
www.ti.com .................................................................................................................................................. SLUS843B – MAY 2008 – REVISED SEPTEMBER 2008
Table 5. Design Assistance
Channel1
Channel2
FIXED
1.5 V by shorting VFB1 to
3.3 V by shorting
1.05 V by shorting
VOLTAGE
5 V by shorting VFB1 to GND
V5FILT
REFIN2 to V5FILT
REFIN2 to VREF3
OPTIONS
VOUT2 is set by RUPPER_DIV, RLOWER_DIV, and
VOUT1 is set by RUPPER_DIV, RLOWER_DIV, and VFB1 Figure 46
ADJUSTABLE
VOLTAGE
(8)
OPTIONS
(7)
where
V
VREF = 2 V
V
VFB1 = 0.7 V
V
VOUT2 = VREFIN2
Figure 46. Channel1 Adjustable Voltage Configuration
Figure 47. Channel2 Adjustable Voltage Configuration
Since TPS51427A is a constant on time based controller, minimum ripple requirement at the output is necessary
to keep the main voltage loop stable. For loop stability, the ESR zero frequency, f0 must be lower than 1/4 of the
switching frequency. This requirement can be easily fulfilled by using either POSCAP or SPCAP, due to their
similar characteristics. In order for a constant on time topology to work properly in a real world environment,
there should not be any substantial phase delay contributed by the parasitic model of the output capacitors. Such
delay would create distortion to the essential feedback signal necessary for the device to process.
In a TPS51427A design, it is generally recommended to optimize the output voltage ripple at around 1.5% of the
targeted DC voltage in both auto-skip and PWM mode operations. Higher ripple is better in terms of jitter
performance, however, lower ripple improves the line regulation and efficiency performance. It is a common
practice as an attainable goal to optimize the converter design in terms of regulation and efficiency.
There is an additional voltage loop in the TPS51427A design that needs to be considered. OOA (out-of-audio)
mode is designed to keep the minimum switching frequency at least 22 kHz in the light load/no load operation in
order to minimize the audible noise in the notebook system design during standby mode. Both main voltage loop
and OOA loop require certain output ripple in order for the device to function properly. If the ripple is too low, the
main loop is unstable. If OOA mode operation is desired, the recommended ripple cannot be more than 1% of
the target DC voltage.
Copyright 2008, Texas Instruments Incorporated
33
Product Folder Link(s): TPS51427A
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS51427ARHBTG4 功能描述:DC/DC 開關(guān)控制器 Dual D-Cap Synch Step Down 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
TPS51427RHBR 功能描述:DC/DC 開關(guān)控制器 Dual D-Cap Synch Step Down 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
TPS51427RHBRG4 功能描述:DC/DC 開關(guān)控制器 Dual D-Cap Sync Step Down 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
TPS51427RHBT 功能描述:DC/DC 開關(guān)控制器 Dual D-Cap Synch Step Down 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
TPS51427RHBTG4 功能描述:DC/DC 開關(guān)控制器 Dual D-Cap Sync Step Down 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
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