参数资料
| 型号： | IR3505MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CONTROL 16-MLPQ |
| 标准包装： | 100 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 3mA |
| 电源电压： | 8 V ~ 16 V |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-MLPQ |
| 供应商设备封装： | 16-MLPQ（3x3） |
| 包装： | 剪切带 (CT) |
IR3505
Over Voltage Protection (OVP)
The IR3505 includes over-voltage protection that turns on the low side MOSFET to protect the load in the event
of a shorted high-side MOSFET, converter out of regulation, or connection of the converter output to an
excessive output voltage. As shown in Figure 6, if ISHARE pin voltage is above V(VCCL) – 0.8V, which
represents over-voltage condition detected by control IC, the over-voltage latch is set. GATEL drives high and
GATEH drives low. The OVP circuit overrides the normal PWM operation and within approximately 150ns will
fully turn-on the low side MOSFET, which remains ON until ISHARE drops below V(VCCL) – 0.8V when over
voltage ends. The over voltage fault is latched in control IC and can only be reset by cycling the power to
control IC. The error amplifier output (EAIN) is pulled down by control IC and will remain low. The lower
MOSFETs alone can not clamp the output voltage however an SCR or N-MOSFET could be triggered with the
OVP output to prevent processor damage.
OUTPUT
VOLTAGE
OVP
THRESHOLD
(VO)
VCCL-800 mV
ISHARE(IIN)
GATEH
GATEL
FAULT LATCH
(CONTROL IC)
ERROR
AMPLIFIER
VDAC
INPUT
(EAIN)
AFTER
NORMAL OPERATION
OVP CONDITION
OVP
Figure 6 - Over-voltage protection waveforms
PWM Ramp
Every time the phase IC is powered up PWM ramp magnitude is calibrated to generate a 50 mV/% ramp for a
VCC=12V. For example, for a 15% duty ratio the ramp amplitude is 750mV for VCC=12V. Feed-forward
control is achieved because the PWM ramp varies with VCC voltage proportionally after calibration.
Debugging Mode
If CSIN+ pin is pulled up to VCCL voltage, IR3505 enters into debugging mode. Both drivers are pulled low
and ISHARE output is disconnected from the current share bus, which isolates this phase IC from other
phases. However, the phase timing from PHSIN to PHSOUT does not change.
Sept 26 , 2007
Page 12 of 19
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| IR3505ZMTRPBF | IC XPHASE3 CTLR 2.5A 16-MLPQ |
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| IR3507MTRPBF | IC XPHASE3 CONTROL 20-MLPQ |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3505MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE3 DDR VTT 7V 2A 3 Wire 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 |
| IR3505Z | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3505ZMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3505ZMTRPBF | 功能描述:开关变换器、稳压器与控制器 Xphase3 IR3505Z AMD PVID 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 |
| IR3506 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM DDR & VTT PHASE IC |
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