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| 型号： | IR3623MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 15/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32MLPQ |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1.2MHz |
| 占空比： | 85% |
| 电源电压： | 8.5 V ~ 14.5 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 ~ 125°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | IR3623MTRPBFDKR |
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IR3623MPbF
Over-Current Protection
The over current protection is performed by
28uA
sensing current through the R DS(on) of low side
MOSFET. This method enhances the converter’s
22uA
OCP
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.
SS1 / SD
20
3uA
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:
Fig. 14: 3uA current source for discharging
soft-start capacitor during hiccup
The OCP circuit starts sampling current 200ns
(typical) after PWM signal goes high. The OCSet
V OCSet ? (I OCSet ? R OCSet ) ? (R DS(on) ? I L )
I OCSET
IR3623
OCSet R SET
- - - - ( 6 )
IP200x
Q1
L1
V OUT
pin is internally clamped to prevent false trigging,
figure 15 shows the OCSet pin during one
switching cycle.
Q2
Hiccup
Control
OCGnd
Fig. 13: Connection of over current sensing resistor
I OCset * R OCset
The critical inductor current can be calculated by
setting:
V OCSet ? (I OCSet ? R OCSet ) ? (R DS(on) ? I L ) ? 0
I SET ? I L ( critical ) ?
R OCSet ? I OCSet
R DS ( on )
- - - - ( 7 )
Fig. 15: OCset pin during normal condition
Ch1: Inductor point, Ch2:Ldrv, Ch3:OCSet
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.
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.
www.irf.com
January 28, 2013
15
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相关代理商/技术参数 |
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| IR3624MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 10-MLPD 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) |
| IR3624MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 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 |
| IR3628MPBF | 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) |
| IR3628MTRPBF | 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 |
| IR3629 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
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