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参数资料
| 型号： | IR3505ZMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CTLR 2.5A 16-MLPQ |
| 标准包装： | 1 |
| 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： | 标准包装 |
| 其它名称： | IR3505ZMTRPBFDKR |
IR3505Z
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.
In response to a load step-up the error amplifier can demand 100 % duty cycle. In order to avoid pulse
skipping under this scenario and allow the BOOST cap to replenish, a minimum off time is allowed in this
mode of operation. As shown in Figure 6, 100 % duty is detected by comparing the PWM latch output
(PWMQ) and its input clock (PWM_CLK). If the PWMQ is high when the PWM_CLK is asserted the TopFET
turnoff is initiated. The TopFET is again turned on once the RMPOUT drops within 200 mV of the VDAC.
CLKIN
PHSIN
(2 Phase Design)
NORMAL OPERATION
EAIN
100 % DUTY OPERATION
RMPOUT
PWMQ
VDAC
80ns
VDAC+200mV
Figure 7: PWM Operation during normal and 100 % duty mode.
Debugging Mode
If CSIN+ pin is pulled up to VCCL voltage, IR3505Z 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.
Emulated Bootstrap Diode
IR3505Z integrates a PFET to emulate the bootstrap diode. An external bootstrap diode connected from VCCL
pin to BOOST pin can be added to reduce the drop across the PFET but is not needed in most applications.
Page 13 of 20
March 17, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3506 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM DDR & VTT PHASE IC |
| IR3506MTRPBF | 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 |
| IR3507 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM PHASE IC |
| IR3507MPBF | 制造商:International Rectifier 功能描述: |
| IR3507MTRPBF | 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 |
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