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| 型号： | IR3502MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 19/39页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CONTROLLER 32-MLPQ |
| 标准包装： | 1 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 8mA |
| 电源电压： | 8 V ~ 16 V |
| 工作温度： | 0°C ~ 100°C |
| 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： | 标准包装 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 其它名称： | IR3502MTRPBFDKR |
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IR3502
Constant Over-Current Control during Soft Start
The over current limit is fixed by 1.17V above the VDAC. If the VDRP pin voltage, which is proportional to the
average current plus VDAC voltage, exceeds (VDAC+1.17V) during soft start, the constant over-current control is
activated. Figure 11 shows the constant over-current control with delay during soft start. The delay time is set by the
ROSC resistor, which sets the number of switching cycles for the delay counter. The delay is required since over-
current conditions can occur as part of normal operation due to inrush current. If an over-current occurs during soft
start (before VRRDY is asserted), the SS/DEL voltage is regulated by the over current amplifier to limit the output
current below the threshold set by OC limit voltage. If the over-current condition persists after delay time is reached,
the fault latch will be set pulling the error amplifier’s output low and inhibiting switching in the phase ICs. The
SS/DEL capacitor will discharge until it reaches 0.2V and the fault latch is reset allowing a normal soft start to occur.
If an over-current condition is again encountered during the soft start cycle, the constant over-current control actions
will repeat and the converter will be in hiccup mode. The delay time is controlled by a counter which is triggered by
clock. The counter values vary with switching frequency per phase in order to have a similar delay time for different
switching frequencies.
ENABLE
INTERNAL
OC DELAY
4.0V
3.92V
3.88V
SS/DEL
1.1V
EA
VOUT
VRRDY
OCP THRESHOLD
=VDAC_BUFF+1.17V
IOUT
START-UP WITH
OUTPUT SHORTED
HICCUP OVER-CURRENT
PROTECTION (OUTPUT
SHORTED)
NORMAL
START-UP
OCP
DELAY
OVER-CURRENT
PROTECTION
(OUTPUT SHORTED)
NORMAL NORMAL
START-UP OPERATION POWER-DOWN
NORMAL
(OUTPUT
OPERATION SHORTED)
Figure 11 Constant over-current control waveforms during and after soft start.
Over-Current Hiccup Protection after Soft Start
The over current limit is fixed at 1.17V above the VDAC. Figure 11 shows the constant over-current control with
delay after VRRDY is asserted. The delay is required since over-current conditions can occur as part of normal
operation due to load transients or VID transitions.
If the VDRP pin voltage, which is proportional to the average current plus VDAC voltage, exceeds (VDAC+1.17V)
after VRRDY is asserted, it will initiate the discharge of the capacitor at SS/DEL. The magnitude of the discharge
current is proportional to the voltage difference between VDRP and (VDAC+1.17V) and has a maximum nominal
value of 55uA. If the over-current condition persists long enough for the SS/DEL capacitor to discharge below the
120mV offset of the delay comparator, the fault latch will be set pulling the error amplifier’s output low and inhibiting
switching in the phase ICs and de-asserting the VRRDY signal. The output current is not controlled during the delay
time. The SS/DEL capacitor will discharge until it reaches 200 mV and the fault latch is reset allowing a normal soft
Page 19 of 39
July 28, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3503MTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3503 AMD SVID CTRL IC 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 |
| IR3504MPBF | 制造商:International Rectifier 功能描述:Control IC 32-Pin MLPQ Strip |
| IR3504MTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3504 AMD SVID CTRL IC 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 |
| IR3505 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3505MPBF | 功能描述:IC XPHASE3 CONTROL 16-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase3™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
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