參數(shù)資料
型號(hào)： PM6685TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32
文件頁(yè)數(shù)： 42/52頁(yè)
文件大小： 2536K
代理商： PM6685TR
PM6685
Design example
47/52
10.5
Input capacitor
Maximum input capacitor RMS current is about 3.4A. Then ICinRMS > 3.4A
We put three 10uF ceramic capacitors with Irms = 1.5A.
10.6
Synchronous rectifier
OUT5: Schottky diode STPS1L30M
OUT3: Schottky diode STPS1L30M
10.7
Integrator loop
OUT5: The ripple is greater than 30mV, then the virtual ESR network is not required.
CINT =1nF; Cfilt = 47pF; RINT = 1K
OUT3: The ripple is greater than 30mV, then the virtual ESR network is not required.
CINT =1nF; Cfilt = 47pF; RINT = 1K
10.8
Layout guidelines
The layout is very important in terms of efficiency, stability and noise of the system. It is
possible to refer to the PM6685 demoboard for a complete layout example.
For good PC board layout follows these guidelines:
●
Place on the top side all the power components (inductors, input and output capacitors,
MOSFETs and diodes). Refer them to a power ground plan, PGND. If possible, reserve
a layer to PGND plan. The PGND plan is the same for both the switching sections.
●
AC current paths layout is very critical (see Figure 41 on page 48). The first priority is to
minimize their length. Trace the LS MOSFET connection to PGND plan as short as
possible. Place the synchronous diode D near the LS MOSFET. Connect the LS
MOSFET drain to the switching node with a short trace.
●
Place input capacitors near HS MOSFET drain. It is recommended to use the same
input voltage plan for both the switching sections, in order to put together all input
capacitors.
●
Place all the sensitive analog signals (feedbacks, voltage reference, current sense
paths) on the bottom side of the board or in an inner layer. Isolate them from the power
top side with a signal ground layer, SGND. Connect the SGND and PGND plans only in
one point (a multiple vias connection is preferable to a 0 ohm resistor connection) near
the PGND device pin. Place the device on the top or on the bottom size and connect
the exposed pad and the SGND pins to the SGND plan (see Figure 41 on page 48).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6686 制造商:STMicroelectronics 功能描述:
PM6686TR 功能描述:DC/DC 開關(guān)控制器 Step-down Controller w/adj. voltages-dual RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
PM6-6F-L 功能描述:端子 Metric Fork Terminal non-insulated, 4.0 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp
PM6-6R-D 制造商:Panduit Corp 功能描述:
PM6-6R-L 功能描述:端子 Metric Ring Terminal non-insulated, 2.5 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp
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