参数资料
| 型号： | IR3507ZMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC CTRL XPHASE3 20-MLPQ |
| 标准包装： | 3,000 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 4mA |
| 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： | 20-MLPQ |
| 供应商设备封装： | 20-MLPQ（4x4） |
| 包装： | 带卷 (TR) |
IR3507Z
Over Voltage Protection (OVP)
The IR3507Z 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 IOUT 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 IOUT 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.
Operation at Higher Output Voltage
The proper operation of the phase IC is ensured for output voltage up to 5.1V. Similarly, the minimum VCC for
proper operation of the phase IC is 8 V. Below this voltage, the current sharing performance of the phase IC is
affected.
DESIGN PROCEDURES - IR3507Z
Inductor Current Sensing Capacitor C CS and Resistor R CS
The DC resistance of the inductor is utilized to sense the inductor current. Usually the resistor R CS and capacitor C CS
in parallel with the inductor are chosen to match the time constant of the inductor, and therefore the voltage across
the capacitor C CS represents the inductor current. If the two time constants are not the same, the AC component of
the capacitor voltage is different from that of the real inductor current. The time constant mismatch does not affect the
average current sharing among the multiple phases, but does effect the current signal IOUT as well as the output
voltage during the load current transient if adaptive voltage positioning is adopted.
Measure the inductance L and the inductor DC resistance R L . Pre-select the capacitor C CS and calculate R CS as
follows.
R CS =
L R L
C CS
(1)
Bootstrap Capacitor C BST
Depending on the duty cycle and gate drive current of the phase IC, a capacitor in the range of 0.1uF to 1uF is
needed for the bootstrap circuit.
Decoupling Capacitors for Phase IC
A 0.1uF-1uF decoupling capacitor is required at the VCCL pin.
CURRENT SHARE LOOP COMPENSATION
The internal compensation of current share loop ensures that crossover frequency of the current share loop is at least
one decade lower than that of the voltage loop so that the interaction between the two loops is eliminated. The
crossover frequency of current share loop is approximately 8 kHz.
Page 14 of 19
IR Confidential
April 2, 2009
相关PDF资料 |
PDF描述 |
|---|---|
| IR3508MTRPBF | IC XPHASE3 CTLR 20-MLPQ |
| IR3508ZMTRPBF | IC CTRL XPHASE3 20MLPQ |
| IR3510MPBF | IC XPHASE CONTROL 32-MLPQ |
| IR3513ZMTRPBF | IC CTRL XPHASE3 POL 32-MLPQ |
| IR3514MTRPBF | IC XPHASE3 CONTROL HYBRD 40-MLPQ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3508 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3508MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3508MTRPBF | 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 |
| IR3508Z | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3508ZMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
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