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參數(shù)資料
| 型號： | TPS51221RTVRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件頁數(shù)： | 13/39頁 |
| 文件大?。?/td> | 829K |
| 代理商： | TPS51221RTVRG4 |
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DETAILED DESCRIPTION
ENABLE AND SOFT START
200 ms
960 ms
Vout1
EN1
Vout1
External
Soft-start
time
EN1>1V
EN1<2V
1)Internal
Soft-start
2)External
Soft-start
PRE-BIASED START-UP
SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
When EN is Low, the TPS51221 is in the shutdown state; only the 3.3-V LDO stays alive, and consumes 7
A
(typically). When EN becomes High, the TPS51221 is in the standby state. The 2-V reference and the 5-V LDO
become enabled, consume about 80
A with no load condition, and are ready to turn on SMPS channels. Each
SMPS channel is turned on when ENx becomes High. After ENx is set to high, the TPS51221 begins softstart,
and ramps up the output voltage from zero to the target voltage with 0.96 ms. However, if a slower soft-start is
required, an external capacitor can be tied from the ENx pin to GND. In this case, the TPS51221 charges the
external capacitor with the integrated 2-
A current source. An approximate external soft-start time would be
tEX-SS=CEX / IEN12, it means the time from ENx=1V to ENx=2V. Recommend capacitance is more than 2.2nF.
Figure 38. Enable and Soft-Start Timing
Table 1. Enable Logic States
EN
EN1
EN2
VREG3
VREF2
VREG5
CH1
CH2
GND
Don’t Care
ON
Off
Hi
Lo
ON
Off
Hi
Lo
ON
Off
Hi
Lo
Hi
ON
Off
ON
Hi
ON
The TPS51221 supports a pre-biased start up by preventing negative inductor current during soft-start when the
output capacitor holds some charge. The initial DRHV signal waits until the voltage feedback signal becomes
greater than the internal reference ramping up by the soft-start function. After that, the start-up occurs the same
way the the soft-start condition fully discharges, regardless of the SKIPSELx selection.
20
Copyright 2007–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51221
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS51221RTVT | 功能描述:電流型 PWM 控制器 Fixed Freq Notebook Sys Pwr Dual Cntrlr RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| TPS51221RTVTG4 | 功能描述:電流型 PWM 控制器 Fixed Freq Notebook Sys Pwr Cntrlr RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| TPS51222 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller |
| TPS51222RTVR | 功能描述:電流型 PWM 控制器 Fixed-Freq,Notebook Sys Pwr Cntrlr RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| TPS51222RTVT | 功能描述:電流型 PWM 控制器 Fixed-Freq,Notebook Sys Pwr Cntrlr RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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