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参数资料
| 型号： | IR3629AMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 10/23页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM SYNC BUCK 12-MLPD |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 应用： | 控制器，DDR |
| 输入电压： | 4.5 V ~ 14 V |
| 输出数： | 1 |
| 输出电压： | 可调至 0.6V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-VFDFN 裸露焊盘 |
| 供应商设备封装： | 12-MLPD |
| 包装： | 标准包装 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 其它名称： | IR3629AMTRPBFDKR |
IR3629/IR3629A MPbF
Over-Current Protection
28uA
The over current protection is performed by
sensing current through the R DS(on) of the low-
side MOSFET. This method enhances the
20uA
OCP
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
SS1 / SD
20
3uA
MOSFET (Q2) which determines the current limit
set point.
Fig. 8: 3uA current source for discharging
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:
V OCSet = (I OCSet ? R OCSet ) ? (R DS(on) ? I L ) --( 2 )
soft-start capacitor during hiccup
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
IR3624
IR3629/29A
I OCSET
OCSet R SET
Q1
L1
V OUT
about 150ns delay to mask the deadtime. Since
this node contains switching noises, this delay
also functions as a filter.
Hiccup
Control
Q2
Fig. 7: Connection of over current sensing resistor
The critical inductor current can be calculated by
Deadtime
setting:
V OCSet = (I OCSet ? R OCSet ) ? (R DS(on) ? I L ) = 0
R OCSet ? I OCSet
I SET = I L ( critical ) =
--( 3 )
R DS ( on )
I OCSet *R OCSet
Blanking time
Clamp voltage
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.
11/29/2007
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.
10
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相关代理商/技术参数 |
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| IR3629MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| IR3629MTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| IR3637ASPBF | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3637ASTRPBF | 功能描述:开关变换器、稳压器与控制器 High Volt Sych PWM 600kHz 5V PWM RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3637SPBF | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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