參數(shù)資料
型號(hào)： TEA1211
廠商： NXP Semiconductors N.V.
英文描述： High efficiency auto-up/down DC/DC converter
中文描述： 高效率auto-up/down直流/直流轉(zhuǎn)換器
文件頁(yè)數(shù)： 6/23頁(yè)
文件大小： 125K
代理商： TEA1211
2003 Oct 13
6
Philips Semiconductors
Preliminary specification
High efficiency auto-up/down
DC/DC converter
TEA1211HN
7.2.1
PWM
PWM results in minimum AC currents in the circuit
components and hence optimum efficiency, cost and
EMC. In this mode the output voltage is allowed to vary
between two predefined voltage levels. When the output
voltage stays within this so called window, switching
continues in a fixed pattern. When the output voltage
reaches one of the window borders, the digital controller
immediately reacts by adjusting the duty cycle and
inserting a current step in such a way that the output
voltage stays within the window with higher or lower
current capability. This approach enables very fast
reaction to load variations.
Figure 4 shows the TEA1211HN’s response to a sudden
load increase in case of up conversion. The upper trace
shows the output voltage. The ripple on top of the DC level
is a result of the current in the output capacitor, which
changes in sign twice per cycle, multiplied by the
capacitor’s internal Equivalent Series Resistance (ESR).
After each ramp-down of the inductor current, or when the
ESR effect increases the output voltage, the TEA1211HN
determines what to do in the next cycle. As soon as more
load current is taken from the output the output voltage
starts to decay. When the output voltage becomes lower
than the low limit of the window, corrective action is taken
by a ramp-up of the inductor current during a much longer
time. As a result, the DC current level is increased and
normal PWM control can continue. The output voltage
(including ESR effect) is again within the predefined
window.
Figure 5 depicts the spread of the output voltage window.
Theabsolutevalueismostdependentonspread,whilethe
actual window size is not affected. For one specific device,
the output voltage will not vary more than 2 % typically.
7.2.2
PFM
In low output power situations, TEA1211HN will switch
over to PFM mode operation in case PWM-only mode is
not activated. In this mode charge is transferred from
battery to output in single pulses with a wait phase in
between. Regulation information from earlier PWM mode
operation is used. This results in optimum inductor peak
current levels in PFM mode, which are slightly larger than
the inductor ripple current in PWM mode. As a result, the
transition between PFM and PWM mode is optimal under
all circumstances. In PFM mode, the TEA1211HN
regulates the output voltage to the limits shown in Fig.5.
Depending on the V
IN
to V
OUT
ratio the TEA1211HN
decides for a 3- or 4-phase cycle, where the last phase is
the wait phase. When the input voltage almost equals the
output voltage, one of the slopes of a 3-phase cycle
becomes weak. Then the charge, or the integral of its
pulse, is near to zero and no charge is transferred. In this
region the 4-phase cycle is used, (see Fig.3).
handbook, full pagewidth
MDB004
start corrective action
load increase
high window limit
low window limit
VOUT
Iload
time
time
Fig.4 Response to load increase in up-mode.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TEA1211HN 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:High efficiency auto-up/down DC/DC converter
TEA1330 制造商:FCI 制造商全稱(chēng):First Components International 功能描述:DUAL LOW-VOLTAGE POWER AMPLIFIER
TEA1401T 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Power plug for the universal mains
TEA1402/N2,112 功能描述:電池管理 TEA1402/DIP18/TUBE-B RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
TEA1501 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Greeny; GreenChip
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