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參數(shù)資料
| 型號(hào)： | IR3629AMTRPBF |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| 中文描述： | 高頻同步PWM降壓控制器與電源良好輸出 |
| 文件頁(yè)數(shù)： | 2/23頁(yè) |
| 文件大小： | 598K |
| 代理商： | IR3629AMTRPBF |
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IR3629/IR3629A MPbF
11/26/2007
Over-Current Protection
The over current protection is performed by
sensing current through the R
DS(on) of the low-
side MOSFET. This method enhances the
converter’s efficiency and reduces cost by
eliminating a current sense resistor. As shown in
figure 7, an external resistor (R
SET) is connected
between OCSet pin and the drain of the low-side
MOSFET (Q2) which determines 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 in a voltage which is given by:
The OCP circuit starts sampling current when the
low gate drive is about 3V. The OCSet pin is
internally clamped during deadtime to prevent
false trigging. Figure 9 shows the OCSet pin
during one switching cycle. As shown, there is
about 150ns delay to mask the deadtime. Since
this node contains switching noises, this delay
also functions as a filter.
Fig. 7: Connection of over current sensing resistor
Fig. 8: 3uA current source for discharging
soft-start capacitor during hiccup
L1
RSET
IR3624
OCSet
IOCSET
VOUT
Hiccup
Control
Q1
Q2
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 a certain
slope rate. As shown in figure 8, a 3uA current
source is used to discharge the soft-start
capacitor.
The OCP comparator resets after every soft start
cycle. 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
)
2
)
--(
I
(R
)
R
(I
V
L
DS(on)
OCSet
=
0
)
I
(R
)
R
(I
V
L
DS(on)
OCSet
=
=
)
3
--(
R
I
R
I
on
DS
OCSet
critical
L
SET
)
(
)
(
=
Fig. 9: 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 IR3629 current
limit is designed primarily as a disaster
preventing, "no blow up" circuit, and does not
operate as a precision current regulator.
The critical inductor current can be calculated by
setting:
20uA
I
OCSet*ROCSet
Blanking time
Deadtime
Clamp voltage
10
IR3629/29A
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| IR3629MPBF | 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(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)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(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| IR3629MTRPBF | 功能描述:電壓模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3637ASPBF | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC 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 包裝:帶卷 (TR) |
| IR3637ASTRPBF | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 High Volt Sych PWM 600kHz 5V PWM 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(kāi)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 |
| IR3637SPBF | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC 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 包裝:帶卷 (TR) |
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