参数资料
| 型号： | IR3087M |
| 厂商： | International Rectifier |
| 文件页数： | 12/35页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE W/OVP/TM CTRL 20-MLPQ |
| 标准包装： | 5 |
| 系列： | XPhase™ |
| 应用： | 处理器 |
| 电流 - 电源： | 10mA |
| 电源电压： | 8.4 V ~ 21 V |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-MLPQ |
| 供应商设备封装： | 20-MLPQ（4x4） |
| 包装： | 剪切带 (CT) |
| 其它名称： | *IR3087M |
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IR3087
IR3087 THEORY OF OPERATION
Block Diagram
The Block diagram of the IR3087 is shown in Figure 6, and specific features are discussed in the following sections.
GATE
RMPIN+
RMPIN-
EAIN
RAMP
COMPARATOR
CLOCK
PULSE
GENERATOR
PWM
COMPARATOR
-
+
ENABLE
PWM
LATCH
S
RESET
DOMINANT
R
-
+
NON-OVERLAP
2V
VCCH
GATEH
COMPARATORS
PWMRMP
ENABLE
RAMP
SLOPE
ADJUST
RAMP
DISCHARGE
CLAMP
0% DUTY
CYCLE
COMPARATOR
VCCL
GATEL
AMP
OVP
CIRCUIT
SCOMP
ISHARE
LGND
10K
SHARE
ADJUST
ERROR
SCOMP
+
20mV
-
+
VDAC
-
ISHARE
+
VDAC
VDAC
X
0.88
+
-
+
COMPARATOR
CURRENT SENSE
AMP
X34
125mV
+
-
INTERNAL
VCC
BIAS
PGND
VCC
DACIN
CSIN+
CSIN-
REFERENCE
OPTIPHS
BIASIN
SYSTEM
BIASIN
VOLTAGE
400mV
OPTI-PHASE DISABLE
COMPARATOR
OPTI-PHASE
COMPARATOR
VOLTAGE
PROPORTIONAL
TO ABSOLUTE
TEMPERATURE
+
-
VRHOT
COMPARATOR
VRHOT
HOTSET
Figure 6. IR3087 Block Diagram
Tri-State Gate Drivers
The gate drivers can deliver up to 3A peak current. An adaptive non-overlap circuit monitors the voltage on the
GATEH and GATEL pins to prevent MOSFET shoot-through current while minimizing body diode conduction.
An Enable signal is provided by the Control IC to the Phase IC without the addition of a dedicated signal line. The
Error Amplifier output of the Control IC drives low in response to any fault condition such as input under voltage or
output overload. The IR3087 0% duty cycle comparator detects this and drives both gate outputs low. This tri-state
operation prevents negative inductor current and negative output voltage during power-down.
The Gate Drivers revert to a high impedance “off” state if VCCL and VCCH supply voltages are below the normal
operating range. An 80k ? resistor is connected across the GATEH/GATEL and PGND pins to prevent the
GATEH/GATEL voltage from rising due to leakage or other cause under these conditions.
Over Voltage Protection (OVP)
The IR3087 includes over-voltage protection that turns on the low side MOSFET to protect the load in the event of a
shorted high-side MOSFET or connection of the converter output to an excessive output voltage. A comparator
monitors the voltage at the CSIN- pin which is usually connected directly to the converter output. If the voltage
exceeds the DACIN voltage plus 125mV typical (100mV minimum and 160mV maximum), the GATEL pin drives
high. The OVP circuit overrides the normal PWM operation and will fully turn-on the low side MOSFET within
approximately 150ns. The low side MOSFET will remain ON until the over-voltage condition ceases.
Page 12 of 35
1 /31/05
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| IR3087MPBF | 功能描述:IC XPHASE W/OVP/TM CTRL 20MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 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 |
| IR3087MTR | 功能描述:IC XPHASE W/OVP/TM CTRL 20L-MLPQ RoHS:否 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 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 |
| IR3087MTRPBF | 功能描述:IC CONTROLLER PHASE 20MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 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 |
| IR3087PBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM PHASE IC WITH OPTI-PHASETM, OVP, AND OVERTEMP DETECT |
| IR3088 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE PHASE IC WITH FAULT AND OVERTEMP DETECT |
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