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參數(shù)資料
| 型號(hào)： | NCP5306 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Three−Phase VRM 9.0 Buck Controller |
| 文件頁數(shù)： | 23/24頁 |
| 文件大?。?/td> | 879K |
| 代理商： | NCP5306 |
NCP5306
http://onsemi.com
23
Figure 31. At Full
Load the Peak
to
Peak Voltage
Ripple on the COMP Pin Should Be Less than 20 mV
for a Well
Tuned/Stable Controller. Higher COMP
Voltage Ripple Will Contribute to Output Voltage Jitter.
Figure 32. The Value of C
AMP
Is Optimal. COMP Slews
Quickly Without Spiking or Ringing. V
OUT
Does Not
Overshoot and Monotonically Settles to Its Final Value.
OCSET
(IOUT,LIM
ILo2)
R
GILIM
(34)
where:
I
OUT,LIM
is the current limit threshold of the converter;
Δ
I
Lo
/2 is half the inductor ripple current;
R is either (R
LMAX
+ R
PCB
) or R
SENSE;
G
ILIM
(nominally 3.75 V/V) is the current sense to I
LIM
gain.
For the overcurrent protection to work properly, the
current sense time constant (RC) should be slightly larger
than the R
L
time constant. If the RC time constant is too fast,
a step load change will cause the sensed current waveform
to appear larger than the actual inductor current and will trip
the current limit at a lower level than expected.
10. PWM Comparator Input Voltage
The voltage at the positive input terminal of the PWM
comparator (see Figure 14 or 16) is limited by the internal
voltage supply of the controller, the size of the internal and
external ramps and the magnitude of the channel startup
offset voltage. To prevent the PWM comparator from
saturating, the differential input voltage from CS
REF
to CSn
(n = 1, 2 or 3) must satisfy the following equation:
VCSREF,MAX
600 mV
VCOx,MAX
230 mV
(35)
2.90 V
where:
VCSREF,MAX
Max VID Setting w AVP @ Full Load
VCOx,MAX
[VCSx
(IO,MAX3
GCSA,MAX
VCSREF]
GCSA,MAX
ILo2)
RMAX
RMAX
RSENSEor (RL,MAX
RPCB,MAX)
11. Soft Start Time
The Soft Start time (T
SS
) can be calculated from:
CSS
VCOMP
Channel_Startup_Offset
160 A
(36)
TSS
CSS
V
ISS
where:
2.3 Vdc(from page 12)
If C
SS
= 0.1
μ
F, then the Soft Start time will be:
VCOMP
VOUT@ 0 A
Int_Ramp
Channel_Startup_Offset
GCSA
Ext_Ramp 2
TSS
0.1 F
1.7 Vdc
160 A
1.06 ms
(37)
The Channel_Startup_Offset is subtracted from V
COMP
as the output does not begin to rise until V
COMP
exceeds this
voltage. As the internal and external ramp values are small,
the Soft Start time may be approximated by:
TSS
CSS
VOUT@ 0 A
ISS
(38)
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| NCP5306/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Three Phase VRM 9.0 Buck Controller |
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| NCP5306DWR2 | 功能描述:IC CTRLR BUCK 3PH VRM 9.0 24SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| NCP5314 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two/Three/Four-Phase Buck CPU Controller |
| NCP5314/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Two/Three/Four-Phase Buck CPU Controller |
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