- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄299801 > QPO-2L (Vicor Corporation) QPO-2L Low Voltage Output Ripple Attenuator PDF資料下載
參數(shù)資料
| 型號(hào)： | 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)： | 8/12頁 |
| 文件大小： | 290K |
| 代理商： | QPO-2L |
Picor Corporation www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 5 of 12
Application of the QPO-2
This product can be used over a 0.3VDC to 5.5VDC
output voltage range using either the remote sense
or the voltage trim feature of the selected
converter. These circuit configurations are shown in
Figures 3 and 4. In either configuration, the source
output voltage will increase to accommodate the
headroom voltage of the QPO-2 filter in order to
maintain the load voltage at the required level. In
the case where remote sense or SC/Trim use is not
possible the QPO-2 can still be used to provide PARD
attenuation with the DC loss of the headroom
voltage at the load. If the supply output can be
trimmed up, the headroom voltage drop of the
QPO-2 can be compensated for at a given load.
Further DC correction for load variation at the QPO-
2 output will occur only within the supply’s control
loop. The QPO-2’s output will be controlled to the
voltage present at the VREF pin in this open loop
filter configuration.
The user must decide on the control mode to be
used and to select the appropriate circuit
configuration for that mode. They must take into
consideration the effects of the headroom setting
and power dissipation versus PARD attenuation.
The majority of the power dissipation of the QPO-2
is the product of the headroom voltage times the
load current and must always be less than 4 watts.
The dynamic headroom range of the QPO-2 is 75mv
to 425mv as long as the maximum power is not
exceeded. It is important that the user understands
the range of expected ripple and transient
performance of their power source to properly bias
and utilize the QPO features. The objective is to
maximize attenuation and minimize dissipation
while staying within the QPO-2 dynamic operating
range. Knowing the worse case maximum steady
state ripple, output impedance and transient
response time of the power source will determine
the minimum required headroom of the QPO-2,
which is set by the value of RHR. See figure 5 below
for the safe operating power curve.
If the peak detector option is enabled the headroom
will automatically increase by the peak of the ripple
amplitude from the setting determined by RHR. This
makes the initial headroom setting less critical
because the headroom and dynamic range will track
the peak of the ripple, maintaining the required
QPO-2 biasing to actively attenuate. Caution must
be taken such that the added peak detection
headroom does not cause power dissipation in
excess of 4 watts. The time constant of this feature is
roughly 30ms in response to ripple amplitude
changes. This feature can be enabled by connecting
the PEAKIN pin to the QPOIN pins and disabled by
putting a resistor between QPOIN and the PEAKIN
pin as shown in Figure 6.
Conversely the optional slope adjust feature will
reduce the headroom proportional to load current
depending on the RSA value selected. This will
reduce the maximum ripple range so this feature is
most useful when the converter ripple amplitude
decreases with increased load current. The feature
can be enabled by selecting the proper RSA value as
described in the headroom slope adjust section of
the datasheet and effectively disabled by using RSA
= 100K.
Figure 7 shows the relationship of the headroom
voltage versus attenuation of the QPO-2 for a 3.3
volt output with a 15 amp load. This relationship is
relatively constant over the full output voltage
rating of the product so this graph can be used for
the 0.3V to 5.5V range when selecting the
headroom voltage. The value of headroom resistor
will be dependent on desired output and headroom
voltages. The selection of the final headroom
voltage should be based on the maximum expected
ripple, desired attenuation, based on the curves in
figure 7, and the transient response time of the
converter. Formulas for SC current setting resistor,
RSC and the RCP clamp setting resistor, are
provided in their respective sections. The headroom
range indicated in figure 7 shows that increasing the
VOUT
QPO-1 IN
PEAK IN
1K
0.1uF
Figure 6 – Peak detect disable circuit.
0
50
100
150
200
250
300
350
400
450
024
68
10
12
14
16
18
20
Output Current (Amps)
Maximum
Headroom
Voltage
(mVolts)
Figure 5 – Safe operating power curve.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| QS54FCT2240ATZB | FCT SERIES, DUAL 4-BIT DRIVER, INVERTED OUTPUT, PZIP20 |
| QS54FCT2240TZB | FCT SERIES, DUAL 4-BIT DRIVER, INVERTED OUTPUT, PZIP20 |
| QS74FCT2244CTZ | FCT SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PZIP20 |
| QS74FCT2244TZB | FCT SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PZIP20 |
| QS54FCT2257TS1 | FCT SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| QPO-2LZ | 功能描述:0.3-5.5V 20A OUT RIP ATTENUATOR RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:Picor®, QUIETPOWER® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時(shí)間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
| QPO-2LZ-01 | 功能描述:IC INTERFACE FILTER RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:Picor®, QUIETPOWER® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時(shí)間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
| QPP-003 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:60W, 869-894 MHz Class AB Power Stage |
| QPP-008 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:35W, 925-960MHz Class AB Driver Stage |
| QPP-015 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuikPAC Module Data |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。