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Switching Mode Power Supply
Design based on L6565
Master : Mr.Ghaderi
Researcher : Dariush Moridi
SMPS
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common EMI حذف
differentials EMI حذف
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می متغیر ورودی ولتاژ اینکه به توجه بااین . از استفاده با را تغییرات این باید باشد
پایه به داد . VFFعناصر انتقال
های مقاومت بین ولتاژ تقسیم ,R8باR9,R10 مقاومت با مورد R18همراه ولتاژ
ی پایه به .VFFنظر رسد می
حذف نویز
TO VFF
FROM MAIN LINE
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ولتاژ تقسیم
مشتق ) شنت رگوالتور نویزگیرگیر(
رگوالتور شنت
کنترل برای ، فیدبکPWM
جریان: کنترل opt حفاظتcoupler
حذف نویز
حلقه در ایزوالسیونفیدبک
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Output circuit design In order to choose the output capacitor, the series resistance of the electrolytic capacitormust be defined.It is well known that the main cause of the output ripple is the series resistance of the electrolytic capacitor, known as ESR.
Electrolytic capacitor Series Resistance
Secondary side Peak current
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Output circuit design Using very low ESR output capacitances, from the catalogue we get the relation
from which
: To have some margin and to have a better thermal spread the final choice is to use two 680µF capacitors in parallel.
610*32C*ESR
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Output circuit design
اعمال ولتاز KVLبا حداکثر توان می ، خروجی درکرد . محاسبه را دیود روی
Finally adding a 10% margin, the STPS20120D has been selected.
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پیچ پیچ Nauxسیم سیم ولتاژ از نمونه یکدیود . کند می القا خود در را D6اولیه
. دارد برعهده ولتاژ این سازی یکسو نقشR5 و جریان نویز C6کنترل حذف نقش
. دارد مدار C5را از بخشی Start-upنیز. باشد می
تغذیه ولتاژ تهیهL6565
To Vcc To ZCD
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To Vcc
Start-up network designTo allow the circuit to start as soon as the line voltage is applied, it is necessary to prechargeboth C5 and C8 capacitances.
های خاژن R3, R2,R1 , R4مقاومت اولیه شارژ نقشC5 . کننده تعیین همچنین و دارند عهده بر را
هستند .start-upجریان
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Start-up network designThe current required by L6565 driver during start-up time determines the (R1+ R2+ R3+ R4) value.Considering that L6565 driver needs a 0.07mA maximum start-up current, we obtain:Start-up resistance must be lower than 3.6 M. in order to reach the best trade-off betweenpower dissipation and time-to-start.
maximum Start-Up current,
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Start-up network designAs a consequence, before choosing start-up resistor, we have to determine C5 capacitance value, is set according to another requirement.C5 must be able to supply L6565 driver until the steady state behavior of the converter isestablished.
Minimum Quiescent current
difference between start-up threshold and under-voltage threshold
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Start-up network designFinally we can set the start-up resistance value in order to reduce time-to-start and contemporarily optimize standby power dissipation. The L6565 has a maximum start-up threshold of 14.5 V, therefore the maximum time-to-start is approximately:A good choice is to put in series four 200 k. resistances (R1= R2= R3= R4= 200 k.), whichdissipate less than 1 W standby power.
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Ic
VcsRcs 17.0
4
7.0
DescriptionThe STC04IE170HV is manufactured in Monolithic ESBT technology, aimed toprovide the best performance in High Frequency / High voltage applications .It is designed for use in Gate Driven based topologies.
Applications■ Fly back / forward SMPS■ Buck-bust converter
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Electrical ratings
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جلوگیراز یورود
سیگنال ناخواست
به هOUTThe pre-charge of C8 base
capacitance is made connecting it to the OUT pin of L6565 through a diode in series to a 2.2 k. resistance.
حذف نویز
جریان : کنترل حفاظتبیس
بیس ولتاژ تهیه) پیوسته)
برای سیگنال CSتهیه
برای ولتاژ افت ایجادCS
جریان کنترلCS
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L6565 SPESIFICATION• LINE FEED FORWARD TO DELIVER CONSTANT POWER vs. MAINS CHANGE•ULTRA-LOW START-UP (< 70µA) AND•QUIESCENT CURRENT (< 3.5mA)•DISABLE FUNCTION (ON/OFF CONTROL)•1% PRECISION (@ Tj = 25°C) INTERNAL REFERENCE VOLTAGE•±400mA TOTEM POLE GATE DRIVER
APPLICATIONSTV/MONITOR SMPSAC-DC ADAPTERS/CHARGERSDIGITAL CONSUMERPRINTERS, FAX MACHINES,PHOTOCOPIERS AND SCANNERS
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INVی کننده بین . error amplifier معکوس عناصر ترکیب با باشد میی پایه و پایه وجود COMPاین به فیدبک شبکه نوع یک توان می
شود . ) نمی استفاده فیدبک نوع این از مدار این در اما INVآورد) شده .زمین
PIN DESCRIPTION
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فیلتر ) نویز حذفهای مولفه
) باال فرکانس
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Description&VFF CS
VFF :ولتاژ تقسیم از استفاده با ورودی ولتاژ پایه R2و R1تغییرات آی VFFو بهرسد . می سی
پایه Voltage Feed Forwardبلوک خروجی VFFولتاژ با و E/Aرا ، کرده ترکیبکننده مقایسه برای را مرجع ولتاژ کند . PWMیک می تهیه
CS :ی کننده با . PWM Compمعکوس ، خوانده را سلف از عبوری جریان باشد میمقاومت از ) ( Rsاستفاده تبدیل باشد می جریانش با متناسب که ولتاژی به را آن
که باشد ولتاژی از بیشتر ولتاژ این اگر ، کرده Voltage Feed Forwardکرده تعیین، Pwm Latch ( شدن خاموش شد صفرخواهد خروجی و شده اگر( MOSFETریست
از حالت 2Vبیشتر به Hiccupشود منجر و شده . Driverشدن Disableفعال شود می
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ZCD Description
Zero
Z C DCurrent Detector
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ولتاژ رگوالتورکلیه) تغذیه تامین
های قسمتداخلی (
Under voltage Lockout : به ورودی ولتاژ که زمانی تانمی . را کردن درایو اجازه نرسد اطمینان قابل مقدار یک
دهد .
حفاظت : ولتاژباال
تقسیم ولتاژ
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خروجی که به Pwm Compزمانی پالس یک ، کند ریست را می Blankingلچی ( TBشروع رسد . ) پایه سیگنال به توجه با زمان دارد compاین ادامه زمان این
. ) خروجی) ، زمان این اتمام با صفر را Blankingخروجی . Setلچ کند می
Starter . : را لچ ابتدا دارد عهده به را اولیه اندازی با . Setراه کند شدن Setمیشود . می متوقف لچ
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Efficiency
PoutPin 100
8.0
80
)max( Vi
Pin)min( Iin mA117
850
100
)min( Vi
Pin)max( Iin
IoutVoutout *P 8033.3*24
mA400250
100
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Questions & Comments
You Can download this project from:
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. برای دانلود جدیدترین مقاالت برق الکترونیک و کامپیوتر به آدرس زیر مراجعه کنید
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THE END