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参数资料
| 型号： | IR3527MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC CTRL XPHASE3 DUAL 24-MLPQ |
| 标准包装： | 3,000 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 8mA |
| 电源电压： | 8 V ~ 28 V |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-MLPQ |
| 供应商设备封装： | 24-MLPQ（4x4） |
| 包装： | 带卷 (TR) |
IR3527
Over Voltage Protection (OVP)
The IR3527 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 7, 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 load damage.
OUTPUT
VOLTAGE
OVP
THRESHOLD
(VO)
VCCL-800 mV
ISHARE(IIN)
GATEH
GATEL
FAULT LATCH
(CONTROL IC)
ERROR
AMPLIFIER
INPUT
(EAIN)
VDAC
NORMAL OPERATION
OVP CONDITION
AFTER
OVP
Figure 7 - Over-voltage protection waveforms
PWM Ramp
Every time the phase IC is powered up PWM ramp magnitude is calibrated to generate a 52.5 mV/%DC (typical)
ramp for a VCC=12V. For example, for a 15% duty ratio the ramp amplitude is 787.5mV 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, IR3527 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.
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V3.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3529 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3529MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3529MTRPBF | 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 |
| IR3531A | 制造商:IRF 制造商全称:International Rectifier 功能描述:41 Phase Dual Output Control IC Pre-bias compatible |
| IR3531A-MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:41 Phase Dual Output Control IC Pre-bias compatible |
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