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參數(shù)資料
| 型號(hào)： | SC471EVB |
| 廠商： | Semtech Corporation |
| 英文描述： | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| 中文描述： | 同步降壓控制器具有多層次VOUT電源支持過渡 |
| 文件頁數(shù)： | 21/27頁 |
| 文件大?。?/td> | 634K |
| 代理商： | SC471EVB |
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21
2006 Semtech Corp.
SC471/SC471A
www.semtech.com
POWER MANAGEMENT
Applications Information
(continued)
There are two sensitive, feedback-related pins at the chip:
VOUT and FB. Proper routing is needed to keep noise
away from these signals. All components connected to
FB should be located directly at the chip, and the copper
area of the FB node minimized. The VOUT trace that
feeds into the VOUT pin, which also feeds the FB resistor
divider, must be kept far away from noise sources such
as switching nodes, inductors and gate drives. Route the
VOUT trace in a quiet layer if possible, from the output
capacitor back to the chip.
For the switcher power section, there are a few key
guidelines to follow:
1) There should be a very small input loop between
the input capacitors, MOSFETs, inductor, and output
capacitors. Locate the input decoupling capacitors
directly at the MOSFETs.
2) The phase node should be a large copper pour, but still
compact since this is the noisiest node.
3) The power GND connection between the input
capacitors, low-side MOSFET, and output capacitors
should be as small as is practical, with wide traces or
planes.
4) The impedance of the power GND connection
between the low-side MOSFET and the GND pin should
be minimized. This connection must carry the DL drive
current, which has high peaks at both rising and falling
edges. Use mulitple layers and multiple vias to minimize
impedance, and keep the distance as short as practical.
Finally, connecting the control and switcher power sections
should be accomplished as follows:
1) Route the VOUT feedback trace in a “quiet” layer, away
from noise sources.
2) Route DL, DH and LX (low side FET gate drive, high side
FET gate drive and phase node) to the chip using wide
traces, with multiple vias if using more than one layer.
These connections are to be as short as possible for loop
minimization, with a length to width ratio less than 20:1
to minimize impedance. DL is the most critical gate drive,
with power GND as its return path. LX is the noisiest node
in the circuit, switching between VBAT and ground at high
frequencies, thus should be kept as short as practical. DH
has LX as its return path. DL, DH, LX, and BST are high-
noise signals and should be kept well away from sensitive
signals, particularly FB and VOUT.
3) BST is also a noisy node and should be kept as short
as possible. The high-side DH driver is relies on the boost
capacitor to provide the DH drive current, so the boost
capacitor must be placed near the IC and connect to the
BST and LX pins using short, wide traces to minimize
impedance.
4) Connect the GND pin on the chip to the VCC decoupling
capacitor and then drop vias directly to the ground plane.
Locate the current limit resistor RLIM at the chip with a
kelvin connection to the drain of the lower MOSFET at the
phase node, and minimize the copper area of the ILIM
trace.
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| SC471MLTRT | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471 | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471A | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471AMLTRT | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
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相關(guān)代理商/技術(shù)參數(shù) |
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| SC-471-H | 制造商:PREMO 制造商全稱:PREMO CORPORATION S.L 功能描述:Common mode chokes with Ferrite cores-SMD format |
| SC471MLTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC472B | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Single-Phase Single Chip Graphics Core Power Supply |
| SC472BMLTRT | 制造商:Semtech Corporation 功能描述:Voltage Mode PWM Controller 0.41V to 1.287V 30A 24-Pin MLP T/R 制造商:Semtech Corporation 功能描述:SINGLE PHASE PWR SUPPLY CONTLR |
| SC-472-X | 制造商:PREMO 制造商全稱:PREMO CORPORATION S.L 功能描述:Common mode chokes with Nanocrystalline cores & Common mode chokes with Ferrite cores - SMD format |
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