参数资料
| 型号： | IR3510MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 21/36页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE CONTROL 32-MLPQ |
| 标准包装： | 100 |
| 系列： | XPhase™ |
| 应用： | 处理器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-MLPQ（5x5） |
| 包装： | 剪切带 (CT) |
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IR3510
Input current limit
Input current limit is required for hot-swap application to eliminate the inrush current drawn from the VIN power
supply. There are two stages of input current limit. The first stage is input current limit, in which the input FET runs
into linear mode first to limit the input current, and it is then latched off after a programmable delay time. The second
stage is the severe over current protection. The input FET is immediately turned off once the input current reaches
the severe OCP threshold. Since it is not latched, once the current is reduced below the severe OCP threshold, the
input FET runs into normal current limit mode and then latched off after time-out.
The input current is sensed by a sense resistor placed
after and in series with the input FET. A 20uA current
source going out of the “ICS-“ pin flows through
Rocset and sets the input current limit threshold.
VIN
Rs
Rocset
P12V
ICS+
Iocset = Rocset x 20uA / Rs
VCX
ICS-
20uA
20uA
The severe OCP threshold voltage is 60mv above the
normal current limit threshold, which gives,
OC REGULATOR
+
3K
Isevere = (Rocset x 20uA + 60mv) / Rs
The input OCP delay is set by an external cap
connected on the “IOCD” pin. Once the input current
limit threshold is reached, a 20uA current source going
out of the “IOCD” pin charges the Cocd. The input FET
is turned off once the “IOCD” is charged above 0.8V
threshold voltage. The time-out delay is,
GATE_I
IOCD
Cocd
Time-out
Latch
-
SEVERE OC COMPARATOR
Tocd = Cocd x 0.8V / 20uA
Fig. 8 Input OCP Control
Two-Level Enable Threshold Voltages
The IR3510 is designed for multiple outputs application, in which a common input FET is used. In order to turn on
each output independently, two-level Enable threshold voltages are used. The first threshold voltage is 0.7v, and is
used to turn on just the input FET; The second threshold is 1.2v, and is used to turn on the voltage regulator output.
The “Enable” pin has internal pull-up to 0.9V. If it is left open, it is above the first threshold, so it turns on the input
FET. To turn on the voltage regulator output, a voltage higher than the second threshold voltage needs to be
applied to the “Enable” pin.
Two-Stage Soft-Start
The IR3510 has a two-stage programmable soft-start to limit the surge current during both the input FET turn-on
and the voltage regulator start-up. The soft-start capacitor connected between the “SS” and “LGND” pins controls
soft start timing. A charge current of 70uA control the up slope of the voltage at the “SS” pin.
The first stage soft-start is controlled by the first enable threshold voltage. Once the Enable voltage is above its first
threshold, the soft-start cap is charged up until it reaches its charge-up threshold voltage. During this soft-start time,
the input FET is controlled by the input soft-start regulator and the voltage after the input FET ramps up following
the soft-start cap voltage. If the Enable voltage is below the second enable threshold voltage, the SS voltage will be
kept charged and complete the soft-start of the input FET.
If a voltage higher than the second enable threshold is applied to the Enable pin after the input FET is fully turned
on, the soft-start cap is quickly discharged and then re-charged up by the same 70ua charging current to provide
the soft-start for the voltage regulator output.
Page 21 of 36
IR Confidential
May 18, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3510MTRPBF | 功能描述:热插拔功率分布 HOT-SWAP N+1 XPHASE CTRL IC RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| IR3513MTRPBF | 功能描述:开关变换器、稳压器与控制器 2 CH OR 2 PHASE SYNC PWM CNTRLR 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 |
| IR3513XMTRPBF | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| IR3513Z | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM POL CONTROL IC |
| IR3513ZMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM POL CONTROL IC |
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