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參數(shù)資料
| 型號(hào)： | IR3622AMTRPbF |
| 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)： | 8/33頁 |
| 文件大?。?/td> | 690K |
| 代理商： | IR3622AMTRPBF |
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IR3622AMPbF
www.irf.com
Over-Current Protection
The over current protection is performed by
sensing current through the R
ds(on) of the low side
MOSFET (Q2). 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 the OCSet pin and the drain of Q2
which sets the current limit set point.
The internal current source develops a voltage
across R
SET. When the Q2 is turned on, the
inductor current flows through the Q2 and results
in a voltage drop which is given by:
The OCP circuit starts sampling current when the
low gate drive is about 3V. The OCSet pin is
internally clamped to approximately 1.4V during
deadtime to prevent false trigging. Figure 15
shows the OCSet pin during one switching cycle.
There is about 150ns delay to mask out the
deadtime, since this node contains switching
noise, this delay also functions as a filter.
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 at a certain
slope rate. As shown in figure 14 the 3uA current
source is used to discharge the soft-start
capacitor.
The OCP comparator resets after every soft start
cycles, and the converter stays in this mode until
the overload or short circuit is removed. The
converter will automatically recover.
SS1 / SD 20
28uA
3uA
OCP
)
6
(
-
)
I
(R
)
R
(I
V
L
ds(on)
OCSet
=
0
)
I
(R
)
R
(I
V
L
ds(on)
OCSet
=
=
)
7
(
-
R
I
R
I
on
ds
OCSet
critical
L
SET
)
(
)
(
=
16
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 IR3622A
current limit is designed primarily as short circuit
protection, "no blow up" circuit, and doesn't
operate as a precision current regulator.
When the SS2 is floating, an over current
condition on either phase would result in hiccup
current protection.
The critical inductor current can be calculated by
setting:
23uA
L1
RSET
IR3622
OCSet
IOCSET
VOUT
Hiccup
Control
Q1
Q2
I
ocset * Rocset
Deadtime
Blanking time
Clamp Voltage
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| IR3622MPBF | 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 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) |
| IR3622MTRPBF | 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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3623MPBF | 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 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) |
| 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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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