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參數(shù)資料
| 型號(hào)： | L5993D |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CONSTANT POWER CONTROLLER |
| 中文描述： | 恒功率控制器 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大小： | 200K |
| 代理商： | L5993D |
pends both on the mains voltage range and the
synchronizationfrequencyrange.
An additional ”fine tuning” can be achieved by
adding a small DC offset (in the ten mV) on the
current sensepin (13, ISEN).
For wide range mains applications it is anyway
recommendedto compensatethe propagationde-
lay of the current sense path (PWM comparator +
latch + driver) with the circuit shown in the ”Appli-
cation Ideas”section, fig.41.
Layout hints
Generally speaking a proper circuitboard layout is
vital for correct operation but is not an easy task.
Careful componentplacing, correct traces routing,
appropriate traces widths and, in case of high
voltages, compliance with isolation distances are
the major issues. The L5993 eases this task by
putting two pins at disposal for separate current
returns of bias (SGND) and switch drive currents
(PGND) The matter is complex and only few im-
portant pointswill be here reminded.
1) All current returns (signal ground, power
ground, shielding, etc.) should be routed sepa-
rately and should be connected only at a single
ground point.
2) Noise coupling can be reduced by minimizing
the area circumscribed by current loops. This
applies particularly to loops where high pulsed
currentsflow.
3) For high current paths, the traces should be
doubled on the other side of the PCB whenever
possible: this will reduce both the resistance
and the inductanceof the wiring.
4) Magnetic field radiation (and stray inductance)
can be reduced by keeping all traces carrying
switchedcurrentsas short as possible.
5) In general, traces carrying signal currents
should run far from traces carrying pulsed cur-
rents or with quickly swinging voltages. From
this viewpoint, particular care should be taken
of the high impedance points (current sense in-
put, feedback input, ...).It could be a good idea
to route signal traces on one PCB side and
power traceson theother side.
6) Provide adequate filtering of some crucial
points of the circuit, such as voltagereferences,
IC’s supplypins, etc.
L5993
14/22
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| L5993D013TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L5994 | 功能描述:電流型 PWM 控制器 Adj Triple Out Pwr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L5994_02 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| L5994A | 功能描述:監(jiān)控電路 ADJT TRIPLE OUTPUT POWER SUPPLY CNTLR RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| L5995 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
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