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參數(shù)資料
| 型號： | 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偏置啟動 |
| 文件頁數(shù)： | 7/29頁 |
| 文件大小： | 389K |
| 代理商： | IR3621FTR |
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IR3621 & (PbF)
7
www.irf.com
FUNCTIONAL DESCRIPTION
Introduction
The IR3621 is a versatile device for high performance
buck converters. It consists of two synchronous buck
controllers which can be operated either in two indepen-
dent mode or in current share mode.
The timing of the IC is provided by an internal oscillator
circuit which generates two out-of-phase clock that can
be programmed up to 500kHz per phase.
Figure 4 - Loss-less inductive current sensing
and current sharing.
In the diagram, L1 and L2 are the output inductors. R
L1
and R
L2
are inherent inductor resistances. The resistor
R1 and capacitor C1 are used to sense the average in-
ductor current. The voltage across the capacitors C1
and C2 represent the average current flowing into resis-
tance R
L1
and R
L2
. The time constant of the RC network
should be equal or at most three times larger than the
time constant L
1
/R
L1
.
R
L1
L1
R
L1
R1
L2
R
L2
R2
C2
IR3621
Comp
0.8V
Fb1
VP2
FB2
Master E/A
Slave E/A
PWM Comp2
PWM Comp1
C1
V
OUT
R1
×
C1=(1~3)
×
L1
Figure 5 - 30A Current Sharing using Inductor sensing
(5A/Div)
Supply Voltage
Vcc is the supply voltage for internal controller. The op-
erating range is from 5.5V to 14.5V. It also is fed to the
internal LDO. When Vcc is below under-voltage thresh-
old, all MOSFET drivers will be turned off.
Internal Regulator
The regulator powers directly from Vcc and generates a
regulated voltage (Typ. 6.2V@40mA). The output is pro-
tected for short circuit. This voltage can be used for charge
pump circuitry as shown in Figure12.
Input Supplies UnderVoltage LockOut
The IR3621 UVLO block monitors three input voltages
(Vcc, VcH1 and VcH2) to ensure reliable start up. The
MOSFET driver output turn off when any of the supply
voltages drops below set thresholds. Normal operation
resumes once the supply voltages rise above the set
values.
Mode Selection
The SS2 pin is used for mode selection. In current share
mode this pin should be floating and in dual output mode
a soft start capacitor must be connected from this pin to
ground to program the start time for the second output.
Independent Mode
In this mode the IR3621 provides control to two indepen-
dent output power supplies with either common or differ-
ent input voltages. The output voltage of each individual
channel is set and controlled by the output of the error
amplifier, which is the amplified error signal from the
sensed output voltage and the reference voltage. The
error amplifier output voltage is compared to the ramp
signal thus generating fixed frequency pulses of variable
duty-cycle, which are applied to the FET drivers, Fig-
ure19 shows a typical schematic for such application.
Currnt Share Mode
This feature allows to connect both outputs together to
increase current handling capability of the converter to
support a common load. The current sharing can be done
either using external resistors or sensing the DCR of
inductors (see Figure 4).
In this mode, one control loop acts as a master and sets
the output voltage as a regular Voltage Mode Buck con-
troller and the other control loop acts as a slave and
monitors the current information for current sharing. The
voltage drops across the current sense resistors (or DCR
of inductors) are measured and their difference is ampli-
fied by the slave error amplifier and compared with the
ramp signal to generate the PWM pulses to match the
output current. In this mode the SS2 pin should be float-
ing.
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相關(guān)代理商/技術(shù)參數(shù) |
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| IR3621FTRPBF | 功能描述:DC/DC 開關(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:- 標準包裝: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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 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:- 標準包裝: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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 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 標準包裝: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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| IR3621MTRPBF | 功能描述:DC/DC 開關(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 安裝風格: 封裝 / 箱體:CPAK |
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