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參數(shù)資料
| 型號(hào)： | SC411EVB |
| 廠商： | Semtech Corporation |
| 英文描述： | Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller |
| 中文描述： | 同步降壓偽固定頻率電源控制器 |
| 文件頁數(shù)： | 20/27頁 |
| 文件大小： | 488K |
| 代理商： | SC411EVB |
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20
2007 Semtech Corp.
www.semtech.com
SC411
POWER MANAGEMENT
Figure 9: Power Component Placement and Copper Pours
Key points for the power section:
1) There should be a very small input loop, well decoupled.
2) The phase node should be a large copper pour, but compact since this is the noisiest node.
3) Input power ground and output power ground should not connect directly, but through the ground planes instead.
4) The current limit resistor should be placed as close as possible to the ILIM and LX pins.
Connecting the control and power sections should be accomplished as follows (see Figure 10 on the following page):
1) Route VOUT 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 chip using wide traces
with multiple vias if using more than one layer. These connections 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 ground
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.
3) BST is also a noisy node and should be kept as short as possible.
4) Connect PGND and VSSA directly to the thermal pad, and connect the thermal pad to the ground plane using mul-
tiple vias.
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| SC411MLTRT | Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller |
| SC412A | Synchronous Buck Controller |
| SC412AEVB | Synchronous Buck Controller |
| SC412AMLTRT | Synchronous Buck Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC411MLTRT | 制造商:Semtech Corporation 功能描述:Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller |
| SC412A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller |
| SC412A_1 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller |
| SC412AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller |
| SC412AMLTRT | 功能描述:IC REG CTRLR BUCK PWM 16-MLP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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