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参数资料
| 型号： | IR3523MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 19/37页 |
| 文件大小： | 0K |
| 描述： | IC XPHASE3 CTLR VR11.1 40-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： | 40-MLPQ |
| 供应商设备封装： | 40-MLPQ（6x6） |
| 包装： | 带卷 (TR) |
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IR3523
Over-Current Hiccup Protection after Soft Start
The over current limit threshold is set by a resistor connected between OCSETx and VDACx pins. Figure 12 shows
the hiccup over-current protection with delay after PGx is asserted. The delay is required since over-current
conditions can occur as part of normal operation due to load transients or VID transitions.
If the IINx pin voltage, which is proportional to the average current plus VDACx voltage, exceeds the OCSETx
voltage after PGx is asserted, it will initiate the discharge of the capacitor at SS/DELx through the discharge current
47uA. If the over-current condition persists long enough for the SS/DELx capacitor to discharge below the 120mV
offset of the delay comparator, a fault latch will be set pulling the error amplifier’s output low and inhibiting switching
in the phase ICs and de-asserting the PGx signal. The SS/DEL capacitor will then continue to discharge through a
4.7uA discharge current until it reaches 200 mV, and the fault latch is reset allowing a normal soft start to occur.
The output current is not controlled during the delay time. If an over-current condition is again encountered during
the soft start cycle, the over-current action will repeat and the converter will be in hiccup mode.
ENABLE
4.0V
3.92V
3.88V
SS/DEL
1.1V
EA
VOUT
VRRDY
OCP THRESHOLD
IOUT
START-UP WITH
OUTPUT SHORTED
HICCUP OVER-CURRENT
PROTECTION (OUTPUT
SHORTED)
NORMAL
START-UP
OCP
DELAY
OVER-CURRENT
PROTECTION
(OUTPUT SHORTED)
NORMAL NORMAL
START-UP OPERATION POWER-DOWN
NORMAL
(OUTPUT
OPERATION SHORTED)
Figure 12 - Hiccup over-current waveforms
Linear Regulator Output (VCCL)
The IR3523 has a built-in linear regulator controller, and only an external NPN transistor is needed to create a
linear regulator. The output voltage of the linear regulator can be programmed between 4.75V and 7.5V by the
resistor divider at VCCLFB pin. The regulator output powers the gate drivers and other circuits of the phase ICs
along with circuits in the control IC, and the voltage is usually programmed to optimize the converter efficiency. The
linear regulator can be compensated by a 4.7uF capacitor at the VCCL pin. As with any linear regulator, due to
stability reasons, there is an upper limit to the maximum value of capacitor that can be used at this pin and it’s a
function of the number of phases used in the multiphase architecture and their switching frequency. Figure 13
shows the stability plots for the linear regulator with 5 phases switching at 750 kHz.
Page 19 of 37
June 20, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3527 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM DUAL PHASE IC |
| IR3527MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM DUAL PHASE IC |
| IR3527MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE3 Dual Phase 7V 1.3A PMIC 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 |
| 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 |
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