參數(shù)資料
型號(hào)： 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)： 16/39頁
文件大?。?/td> 829K
代理商： TPS51221RTVRG4
ILL(DC)
Time
Inductor
Current
ILL(PEAK)
IIND(RIPPLE)
0
I
LL(PEAK)Ramp +
0.25 * 0.2
V
OUT
V
IN
I
OCL(PEAK)
(4)
Time
Inductor
Current
0
Ton
25%ofIOCL(PEAK)
5%ofIOCL(PEAK)
1/f SW
I
RampSignal
LL(PEAK)
ILL(PEAK)
OUT OF AUDIO SKIP OPERATION
www.ti.com............................................................................................................................................... SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009
Figure 40. Boundary Between Pulse Skipping and CCM
Figure 41. Inductor Current Limit at Pulse Skipping
Table 2. Skip Mode Selection
SKIPSELx
GND
VREF2
VREG3
VREG5
OOA Skip (max 7 skips,
OOA Skip (max 15 skips, for equal
Operating Mode
Continuous Conduction
Auto Skip
to or greater than 400kHz)
for <400 kHz)
Out-Of-Audio (OOA) light load mode is a unique control feature that keeps the switching frequency above
acoustic audible frequencies toward virtually no-load condition while maintaining best-of-the-art high conversion
efficiency. When OOA is selected, the switching frequency is kept higher than audible frequency range in any
load condition. The TPS51221 automatically reduces the switching frequency at light-load conditions. OOA
control circuit monitors the states of both MOSFETs and forces an ON state if a predetermined number of pulses
are skipped. This means that the high-side MOSFET is turned on before the output voltage declines down to the
target value, so that eventually an over-voltage condition is caused. The OOA control circuit detects this
over-voltage condition and begins modulating the skip-mode on-time to keep the output voltage.
The TPS51221 supports a wide switching frequency range; therefore, OOA skip mode has two selections; see
Table 2. When 300 kHz switching frequency is selected, max 7 skip (SKIPSEL=3.3V) makes lowest frequency at
37.5kHz. If max 15 skip is chosen, it becomes 18.8kHz; hence, max 7 skip is suitable for less than 400 kHz, and
max 15 skip is for equal to or greater than 400 kHz.
Copyright 2007–2009, Texas Instruments Incorporated
23
Product Folder Link(s): TPS51221
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相關(guān)代理商/技術(shù)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(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)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(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)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(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)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(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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