參數(shù)資料
型號： IR3621F
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
文件頁數(shù)： 9/29頁
文件大?。?/td> 389K
代理商： IR3621F
IR3621 & (PbF)
9
www.irf.com
L1
R
SET
IR3621
OCSet
I
OCSET
V
OUT
Hiccup
Control
Q1
Q2
Figure 9 - Diagram of the over current sensing.
V
OCSET
= I
OCSET
×
R
SET
-R
DS(ON)
×
i
L
---(2)
V
OCSET
= I
OCSET
×
R
SET
- R
DS(ON)
×
I
L
= 0
R
SET
×
I
OCSET
The critical inductor current can be calculated by set-
ting:
I
SET
= I
L(CRITICAL)
=
---(3)
R
DS(ON)
The internal current source develops a voltage across
R
SET
. When the low side switch is turned on, the induc-
tor current flows through the Q2 and results a voltage
which is given by:
The value of R
SET
should be checked in an actual
circuit to ensure that the Over Current Protection
circuit activates as expected. The IR3621 current limit
is designed primarily as disaster preventing, "no blow
up" circuit, and is not useful as a precision current
regulator.
In two independent mode, the output of each channel
is protected independently which means if one output
is under overload or short circuit condition, the other
output will remain functional. The OCP set limit can be
programmed to different levels by using the external
resistors. This is valid for both hiccup mode and latch
up mode.
In 2-phase configuration, the OCP's output depends on
any one channel, which means as soon as one
channel goes to overload or short circuit condition the
output will enter either hiccup or latch-up, dependes on
status of Hiccup pin.
For a given start up time, the soft-start capacitor can be
calculated by:
C
SS
28
μ
A
×
T
START
/0.8V
Over-Current Protection
The IR3621 can provide two different schemes for Over-
Current Protection (OCP). When the Hiccup pin is pulled
high, the OCP will operate in hiccup mode. In this mode,
during overload or short circuit, the outputs enter hiccup
mode and stay in that mode until the overload or short
circuit is removed. The converter will automatically re-
cover.
When the Hiccup pin is pulled low, the OCP scheme
will be changed to the latch up type, in this mode the
converter will be turned off during Overcurrent or short
circuit. The power needs to be recycled for normal
operation.
Each phase has its own independent OCP circuitry.
The OCP is performed by sensing current through the
R
DS(ON)
of low side MOSFET. As shown in Figure 9, an
external resistor (R
SET
) is connected between OCSet pin
and the drain of low side MOSFET (Q2) which sets the
current limit set point.
If using one soft start capacitor in dual configuration for a
precise power up the OCP needs to be set to latch mode.
The soft-start is part of the Over Current Protection
scheme, during the overload or short circuit condition
the external soft start capacitors will be charged and
discharged in certain slope rate to achieve the hiccup
mode function.
28uA
Out-of-Phase Operation
The IR3621 drives its two output stages 180
!
out-of-phase.
In 2-phase configuration, the two inductor ripple currents
cancel each other and result in a reduction of the output
current ripple and yield a smaller output capacitor for the
same ripple voltage requirement.
In single input voltage applications, the input ripple current
reduces. This results in much smaller input capacitor's
RMS current and reduces the input capacitor quantity.
SS1 / SD
20
3uA
Hiccup
Figure 8 - 3uA current source for discharging soft
start-capacitor during Hiccup mode
Pre-bias Startup
The IR3621 allows pre-bias startup without discharging
the output capacitors. The output starts in asynchro-
nous fashion and keeps the synchronous MOSFET off
until the first gate signal for control MOSFET is gener-
ated.
相關(guān)PDF資料
PDF描述
IR3621FTR 2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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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(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
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