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参数资料
| 型号： | IR3504MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 18/42页 |
| 文件大小： | 0K |
| 描述： | IC CTRL XPHASE3 SVID 32-MLPQ |
| 标准包装： | 3,000 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 10mA |
| 电源电压： | 4.75 V ~ 7.5 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： | 带卷 (TR) |
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IR3504
Output 1 (VDD) Adaptive Voltage Positioning (continued)
The voltage difference between VDRP1 and FB1 represents the gained up average current information. Placing a
resistor R DRP1 between VDRP1 and FB1 converts the gained up current information (in the form of a voltage) into a
current forced onto the FB1 pin. This current, which can be calculated using (VDRP1-VDAC1) / R DRP1 , will vary the
offset voltage produced across R FB1 . Since the error amplifier will force the loop to maintain FB1 to equal the
VDAC1 reference voltage, the output regulation voltage will be varied. When the load current increases, the
adaptive positioning voltage V(VDRP1) increases accordingly. (VDRP1-VDAC1) / R DRP1 increases the voltage drop
across the feedback resistor R FB1 , and makes the output voltage lower proportional to the load current. The
positioning voltage can be programmed by the resistor R DRP1 so that the droop impedance produces the desired
converter output impedance. The offset and slope of the converter output impedance are referenced to VDAC1 and
are not affected by changes in the VDAC1 voltage.
Output1 Inductor DCR Temperature Compensation
A negative temperature coefficient (NTC) thermistor can be used for output1 inductor DCR temperature
compensation. The thermistor should be placed close to the output1 inductors and connected in parallel with the
feedback resistor, as shown in Figure 10. The resistor in series with the thermistor is used to reduce the nonlinearity
of the thermistor.
Remote Voltage Sensing
VOSEN X + and VOSEN X - are used for remote sensing and connected directly to the load. The remote sense
differential amplifiers are high speed, have low input offset and low input bias currents to ensure accurate voltage
sensing and fast transient response.
Start-up Sequence
The IR3504 has a programmable soft-start function to limit the surge current during the converter start-up. A
capacitor connected between the SS/DEL X and LGND pins controls soft start timing, over-current protection delay
and hiccup mode timing. Constant current sources and sinks control the charge and discharge rates of the
SS/DEL X .
Figure 11 depicts the SVID start-up sequence. If the ENABLE input is asserted and there are no faults, the SS/DEL X
pin will begin charging, the pre-PWROK 2 bit Boot VID codes are read and stored, and both VDAC pins transition to
the pre-PWROK Boot VID code. The error amplifier output EAOUT X is clamped low until SS/DEL X reaches 1.4V.
The error amplifier will then regulate the converter’s output voltage to match the V(SS/DEL X )-1.4V offset until the
converter output reaches the 2-bit Boot VID code. The SS/DEL X voltage continues to increase until it rises above
the threshold of Delay Comparator where the PG output is allowed to go high. The SVID interface is activated upon
PWROK assertion and the VDAC X along with the converter output voltage will change in response to any SVID
commands.
VCCL under voltage, over current, or a low signal on the ENABLE input immediately sets the fault latch, which
causes the EAOUT pin to drive low, thereby turning off the phase IC drivers. The PG pin also drives low and
SS/DEL X discharges to 0.2V. If the fault has cleared, the fault latch will be reset by the SS/DEL X discharge
comparator allowing another soft start charge cycle to occur.
Other fault conditions, such as output over voltage, open VOSNS sense lines, or an open phase timing daisy chain
set a different group of fault latches that can only be reset by cycling VCCL power. These faults discharge
SS/DEL X , pull down EAOUT X and drive PG low.
SVID OFF codes turn off the converter by discharging SS/DEL X and pulling down EAOUTx but do not drive PG low.
Upon receipt of a non-off SVID code the converter will re-soft start and transition to the voltage represented by the
SVID code as shown in Figure 11.
The converter can be disabled by pulling the SS/DELx pins below 0.6V.
Page 18
July 28, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| 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 |
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