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參數(shù)資料
| 型號： | L5994 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQFP32 |
| 封裝： | TQFP-32 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 322K |
| 代理商： | L5994 |
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Obsolete
Product(s)
- Obsolete
Product(s)
19/26
L5994 - L5994A
Transformer Catch Diode (L5994A only)
The diode which steers the current generated by the secondary winding of the +5.1V transformer should be a
fast-recovery one, with a breakdown voltage greater than:
with a certain safety margin. The diode has to withstand a pulsed current whose peak value is approximately:
while its RMS value is given by:
The DC value is obviously IOUT12.
Transformer Filter Capacitors
The most stringent requirement on the input filter capacitor (connected between V13IN and ground) is its RMS
ripple current rating, which should be at least:
The working voltage should be higher than the voltage generated when the regulator is lightly loaded. Also for
this part the use of high quality electrolytic or OS-CON capacitors is advised.
Layout and Grounding
The electrical design is only the first step in the development of a switching converter. Since currents ranging
from mA to some A, both DC and switched, live together on the same circuitboard, the PCB layout is vital for a
correct operation of the circuit but is not an easy task.
A proper layout process generally includes careful component placing, proper grounding, correct traces routing,
and appropriate trace widths. Fortunately, since low voltages are involved in this kind of applications, isolation
requirements are of no concern.
Referring to literature for a detailed analysis of this matter, only few important points will be here reminded.
1) All current returns (signal ground, power ground, etc.) should be mutually isolated and should be con-
nected only at a single ground point. Ground planes may be extremely useful both to arrange properly
current returns and to minimize radiation (see next 2 points), even though they cannot solve every prob-
lem
2) Noise coupling between adjacent circuitry can be reduced minimizing the area of the loop where current
flows. This is particularly important where there are high pulsed currents, that is the circuit including the
input filter capacitor, the power switch, the synchronous rectifier and the output capacitor. The next pri-
ority should be given to the gate drive circuits.
3) Magnetic field radiation (and stray inductance) can be reduced by keeping all traces which carry
switched currents as short as possible.
4) The Kelvin-connected traces of current sense should be kept short and close together.
5) For high current paths, the traces could be doubled on the other side of the PCB whenever possible: this
will reduce both the resistance and the inductance of the wiring.
6) In general, traces carrying signal currents should run far from traces carrying pulsed currents or with
quickly swinging voltages. From this viewpoint, particular care should be taken of the high impedance
paths (feedback input, current sense traces...). It could be a good idea to route signal traces on one PCB
V
RR
V
IN LIN
5.1
–
() η V
IN M AX
5.1
–
()
+
=
I
13PK
I
OUT12
–
V
IN MIN
V
IN M IN
5.1
–
---------------------------------
I
13R M S
I
OUT12
V
IN M IN
V
IN M IN
5.1
–
---------------------------------
=
I
13AC
I
OUT12
5.1
V
IN M IN
5.1
–
---------------------------------
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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)測電壓數(shù): 監(jiān)測電壓: 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 |
| L5996 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT DYNAMIC DAC CONTROLLER FOR MOBILE CPU |
| L-59BL/1EGW | 制造商:Kingbright Corporation 功能描述: 制造商:Kingbright Corporation 功能描述:LED 5MM RED/GREEN 40MCD/60MCD 制造商:Kingbright Corporation 功能描述:LED, 5MM, RED/GREEN, 40MCD/60MCD 制造商:Kingbright Corporation 功能描述:LED, 5MM, RED/GREEN, 40MCD/60MCD, LED Colour:Red, Green, Height:7.24mm, Width:7. 制造商:Kingbright Corporation 功能描述:Red/grn r/a cbi,5mm,L-59BL/1EGW |
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