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參數(shù)資料
| 型號： | QPO-2L |
| 廠商： | Vicor Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | QPO-2L Low Voltage Output Ripple Attenuator |
| 中文描述： | QPO - 2公升低電壓輸出紋波衰減 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 290K |
| 代理商： | QPO-2L |
Picor Corporation www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 6 of 12
headroom voltage will increase the attenuation, up
to a point of diminishing returns, over the range of
10kHz to over 1Mhz.
With an external 25uF
capacitor connected between the VREF and REFGND
pins the low frequency attenuation from 10Hz to
10kHz will reduce by roughly 10dB. Review the
following transient considerations below before
selecting the operating headroom. The RHR resistor
value is determined by using the following formula.
where; RHR is headroom setting resistor value,
QPOOUT is the expected voltage on the
QPO’s output,
VHR is the target headroom voltage for the
desired range of attenuation.
To ensure sufficient headroom during transient load
changes, a greater headroom voltage than what
would normally be set based on maximum ripple
should be considered. To provide margin to cover
the instantaneous drop in the converter output and
the line drops, additional headroom will be needed.
In the example shown in figure 2 an additional
75mV was included with the headroom voltage
value selected from the graph in figure 7 to cover
the instantaneous drop in the supply output during
the 10 Amp step as explained below.
In Figure 2, a maximum load of 10 Amps allowed for
the RHR value to be calculated to provide 375mV of
headroom to avoid exceeding 4 Watts. In this
example, based on the attenuation graph in Figure
7, 300mV of headroom is the point of diminishing
returns so the maximum attenuation would be
achieved at the fundamental ripple frequency. To
stay within the dynamic range required by the active
loop during a transient, a total of 375mV was used
in the formula to determine the RHR resistor value.
The peak detector will dynamically add 30mV
(derived from the 60mV peak to peak input ripple)
to the static headroom setting providing the total
dynamic headroom of typically 405mV with the
detector enabled.
The input capacitance to the QPO-2 will provide the
transient load current keeping the QPOOUT at the
VREF voltage until the converter loop responds to
regulate the load. During this time the transient
load current capability can be approximated by the
formula below. The capacitance CIN may be within
the power supply that is used or supplemented by
external capacitance. Consideration of the power
supply’s sensitivity to additional output capacitance
and stability must be understood before additional
capacitance is added for transient performance
enhancement.
where; CIN = Input capacitance (assuming low
ESR/ceramic type) at the QPO-2 input,
I = Step load current change,
Tr = Converter response time,
VHR = headroom voltage.
I =
Vhr
* Cin
2Tr
Rhr =
QPOout
* 2.5 k
Vhr +15mV
-100
-80
-60
-40
-20
0
10
100
1K
10K
100K
1M
3M
Frequency [Hz]
27.4k
(269mV)
31.6k
(229mV)
33.2k
(216mV)
37.4k
(189mV)
Rhr=43.2k
(Vheadroom=159mV)
dB
Vout=3.3V
Iload=15A
Rslope=100K
Figure 7 – Attenuation curves without slope adjust.
0
-20
-40
-60
-80
-100
10
100
1K
10K
100K
1M
3M
22.1k
(198mV)
23.7k
(173mV)
26.1k
(146mV)
27.4k
(126mV)
Rhr=29.4k
(Vheadroom=103mV)
W
Vout=3.3V
Iload=10A
Rslope=8.2K
dB
Figure 8 – . Attenuation Curves Using Slope Adjust Feature
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