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參數(shù)資料
| 型號： | LTM4612MPV#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 940 kHz SWITCHING FREQ-MAX, PBGA133 |
| 封裝： | 15 X 15 MM, 2.82 MM HEIGHT, LEAD FREE, MO-222, LGA-133 |
| 文件頁數(shù)： | 5/26頁 |
| 文件大?。?/td> | 5123K |
| 代理商： | LTM4612MPV#PBF |
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LTM4612
4612fa
applicaTions inForMaTion
Output Capacitors
The LTM4612 is designed for low output voltage ripple.
The bulk output capacitors defined as COUT are chosen
with low enough effective series resistance (ESR) to meet
the output voltage ripple and transient requirements. COUT
can be low ESR tantalum capacitor, low ESR polymer
capacitor or ceramic capacitor. The typical capacitance is
150F if all ceramic output capacitors are used. Additional
output filtering may be required by the system designer,
if further reduction of output ripple or dynamic transient
spikeisrequired.Table2showsamatrixofdifferentoutput
voltages and output capacitors to minimize the voltage
droop and overshoot during a 2A/s transient. The table
optimizes total equivalent ESR and total bulk capacitance
to maximize transient performance.
Multiphase operation with multiple LTM4612 devices in
parallel will also lower the effective output ripple current
due to the phase interleaving operation. Refer to Figure 5
for the normalized output ripple current versus the duty
cycle. Figure 5 provides a ratio of peak-to-peak output
ripple current to the inductor ripple current as functions
of duty cycle and the number of paralleled phases. Pick
the corresponding duty cycle and the number of phases
to get the correct output ripple current value. For example,
each phase’s inductor ripple current DIr at zero duty cycle
is ~4.3A for a 36V to 12V design. The duty cycle is about
0.33. The 2-phase curve has a ratio of ~0.33 for a duty
cycle of 0.33. This 0.33 ratio of output ripple current to
the inductor ripple current DIr at 4.3A equals 1.4A of the
output ripple current (
DIL).
The output voltage ripple has two components that are
related to the amount of bulk capacitance and effective
series resistance (ESR) of the output bulk capacitance.
The equation is:
D
V
I
f N C
ESR
I
OUT P P
L
OUT
L
(
)
≈
+
8
Where f is the frequency and N is the number of paral-
leled phases.
DUTY CYCLE (VO/VIN)
0.1 0.15 0.2 0.25
0.35
0.3
0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
4612 F05
6-PHASE
4-PHASE
3-PHASE
2-PHASE
1-PHASE
PEAK-TO-PEAK
OUTPUT
RIPPLE
CURRENT
DIr
RA
TIO
=
Figure 5. Normalized Output Ripple Current vs Duty Cycle, Dlr = VOT/LI
相關(guān)PDF資料 |
PDF描述 |
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| LTM4612IV#PBF | SWITCHING CONTROLLER, 940 kHz SWITCHING FREQ-MAX, PBGA133 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTM4612V | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Ultralow Noise 36VIN, 15VOUT, 5A, DC/DC μModule |
| LTM4613 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:符合 EN55022B 規(guī)格的36VIN、15VOUT、8A、DC/DC μModule 穩(wěn)壓器,LTM®4613 是一款完整、超低噪聲、8A 開關(guān)模式 DC/DC電源。 |
| LTM4613EV#PBF | 功能描述:IC DC/DC UMODULE 8A 133-LGA RoHS:是 類別:電源 - 板載 >> DC DC Converters 系列:µModule® 設(shè)計(jì)資源:VI-200, VI-J00 Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:* 類型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?66V 電壓 - 輸入（最大）:160V Voltage - Output 1:12V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:50W 電壓 - 隔離:* 特點(diǎn):* 安裝類型:通孔 封裝/外殼:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包裝:散裝 工作溫度:-25°C ~ 85°C 效率:* 電源（瓦特）- 最大:* |
| LTM4613EVPBF | 制造商:Linear Technology 功能描述:DC/DC Regulator EN55022B 8A 36V Low EMI |
| LTM4613IV#PBF | 功能描述:IC UMODULE DC/DC 8A 133-LGA RoHS:是 類別:電源 - 板載 >> DC DC Converters 系列:µModule® 設(shè)計(jì)資源:VI-200, VI-J00 Design Guide, Appl Manual 標(biāo)準(zhǔn)包裝:1 系列:* 類型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?18V 電壓 - 輸入（最大）:36V Voltage - Output 1:5.8V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:75W 電壓 - 隔離:* 特點(diǎn):* 安裝類型:通孔 封裝/外殼:9 針法蘭半磚電源模塊 尺寸/尺寸:2.28" L x 2.40" W x 0.50" H（57.9mm x 61.0mm x 12.7mm） 包裝:散裝 工作溫度:-10°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
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