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參數(shù)資料
| 型號： | IR3623MPBF |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| 中文描述： | 高頻2相，單或雙輸出同步降壓控制器，輸出跟蹤和排序 |
| 文件頁數(shù)： | 15/26頁 |
| 文件大小： | 523K |
| 代理商： | IR3623MPBF |
IR3623MPbF
www.irf.com
Over-Current Protection
The over current protection is performed by
sensing current through the R
DS(on)
of low side
MOSFET. This method enhances the converter’s
efficiency and reduce cost by eliminating a
current sense resistor. As shown in figure 13, 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.
The internal current source develops a voltage
across R
SET
. When the low side MOSFET is
turned on, the inductor current flows through the
Q2 and results a voltage which is given by:
The OCP circuit starts sampling current 200ns
(typical) after PWM signal goes high. The OCSet
pin is internally clamped to prevent false trigging,
figure 15 shows the OCSet pin during one
switching cycle.
Fig. 13: Connection of over current sensing resistor
Fig. 14: 3uA current source for discharging
soft-start capacitor during hiccup
An over current is detected if the OCSet pin goes
below ground. This trips the OCP comparator
and cycles the soft start function in hiccup mode.
The hiccup is performed by charging and
discharging the soft-start capacitor in certain
slope rate. As shown in figure 14 a 3uA current
source is used to discharge the soft-start
capacitor.
The OCP comparator resets after every soft start
cycles, the converter stays in this mode until the
overload or short circuit is removed. The
converter will automatically recover.
During this fault condition the Ph_En signal is low
and PWM output is on Tri-state, see figure 12.
SS1 / SD
20
28uA
3uA
OCP
)
6
(
)
I
(R
)
R
(I
V
L
DS(on)
OCSet
OCSet
OCSet
=
0
)
I
(R
)
R
(I
V
L
DS(on)
OCSet
OCSet
OCSet
=
=
)
7
R
I
R
I
I
on
DS
OCSet
OCSet
critical
L
SET
)
(
)
(
=
=
15
Fig. 15: OCset pin during normal condition
Ch1: Inductor point, Ch2:Ldrv, Ch3:OCSet
The value of R
SET
should be checked in an actual
circuit to ensure that the over current protection
circuit activates as expected. The IR3623 current
limit is designed primarily as disaster preventing,
"no blow up" circuit, and doesn't operate as a
precision current regulator.
When the SS2 is floating over current on either
phase would result to hiccup of output voltage.
The critical inductor current can be calculated by
setting:
22uA
L1
R
SET
IR3623
OCSet
I
OCSET
V
OUT
Hiccup
Control
Q1
Q2
IP200x
OCGnd
I
OCset
* R
OCset
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| IR3623MPBF_1 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| IR3623MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ 2-PHASE Single or Dual SYNCH RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3624MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 10-MLPD 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) |
| IR3624MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3628MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
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