參數(shù)資料
型號(hào)： IR3621FTR
廠商： International Rectifier
英文描述： 2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
中文描述： 2相/雙同步PWM控制器，帶有振蕩器同步操作和預(yù)偏置啟動(dòng)
文件頁(yè)數(shù)： 17/29頁(yè)
文件大小： 389K
代理商： IR3621FTR
IR3621 & (PbF)
17
www.irf.com
From (20), R
2
can be express as:
The power stage of current loop has a dominant pole (F
p
)
at frequency expressed by:
R
eq
2
π×
L
2
F
p
=
Where R
eq
is the total resistance of the power stage
which includes the R
ds(on)
of the FET switches, the DCR
of inductor and shunt resistance (if it used).
Set the zero of compensator at 10 times the dominant
pole frequency F
p
, the compensator capacitor, C
2
can
be calculated as:
H(Fo) =
g
m
×
R
S1
×
R
2
×
V
2
π×
Fo
×
L
2
×
V
OSC
IN
R
2
= 1
×
2
π ×
F
O2
×
L
2
×
V
OSC
g
m
×
R
S1
V
IN
Layout Consideration
The layout is very important when designing high fre-
quency switching converters. Layout will affect noise
pickup and can cause a good design to perform with
less than expected results.
Start by placing the power components. Make all the
connections in the top layer with wide, copper filled ar-
eas. The inductor, output capacitor and the MOSFET
should be as close to each other as possible. This helps
to reduce the EMI radiated by the power traces due to
the high switching. Place input capacitor near to the
drain of the high-side MOSFET.
The layout of driver section should be designed for a low
resistance (a wide, short trace) and low inductance (a
wide trace with ground return path directly beneath it),
this directly affects the driver's performance.
To reduce the ESR, replace the one input capacitor with
two parallel ones. The feedback part of the system should
be kept away from the inductor and other noise sources
and must be placed close to the IC. In multilayer PCBs,
use one layer as power ground plane and have a sepa-
rate control circuit ground (analog ground), to which all
signals are referenced. The goal is to localize the high
current paths to a separate loops that does not interfere
with the more sensitive analog control function. These
two grounds must be connected together on the PC board
layout at a single point.
Select a zero crossover frequency for control loop (F
O2
)
1.25 times larger than zero crossover frequency for volt-
age loop (F
O1
):
---(21)
F
o2
1.25%xF
01
Figure18- Case Temperature (TSSOP package) versus Switching Frequency at
Room Temperature
Test Condition: Vin=VcL=VcH1=VcH2=12V, Capacitors used as loads for output
drivers.
Switching Frequency vs. Case Temp
30
40
50
60
70
80
90
200
300
400
500
600
700
Freq (kHz)
C
100pF
1000pF
1800pF
3300pF
R
eq
=R
DS(on)
+R
L
+R
s
F
z
= 10 x F
p
1
2
π
xR
2
xF
z
C
2
=
All design should be tested for stability to verify the cal-
culated values.
相關(guān)PDF資料
PDF描述
IR3621M 2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
IR3621MPBF 2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
IR3621MTR 2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
IR3621MTRPBF 2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
IR3621PBF 2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IR3621FTRPBF 功能描述:DC/DC 開(kāi)關(guān)控制器 2-PHASE DUAL SYNC PWM CTRLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
IR3621M 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
IR3621MPBF 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
IR3621MTR 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤(pán) 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
IR3621MTRPBF 功能描述:DC/DC 開(kāi)關(guān)控制器 2-PHASE DUAL SYNC PWM CTRLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
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