参数资料
| 型号： | ISL62771IRTZ |
| 厂商： | Intersil |
| 文件页数： | 15/36页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTRLR MULTIPHASE 40TQFN |
| 标准包装： | 60 |
| 系列： | Robust Ripple Regulator™ (R³) |
| 应用： | 控制器，AMD Fusion? SVI 2.0 CPU GPU |
| 输入电压： | 4.5 V ~ 25 V |
| 输出数： | 2 |
| 输出电压： | 0.006 V ~ 1.55 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 管件 |
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ISL62771
VW
Figure 10 shows the operation principle in diode emulation mode
at light load. The load gets incrementally lighter in the three cases
from top to bottom. The PWM on-time is determined by the VW
V CRM
MASTER
CLOCK
CLOCK1
PWM1
COMP
window size and therefore is the same, making the inductor
current triangle the same in the three cases. The ISL62771 clamps
the ripple capacitor voltage V CRS in DE mode to make it mimic the
inductor current. It takes the COMP voltage longer to hit V CRS ,
naturally stretching the switching period. The inductor current
triangles move farther apart such that the inductor current
average value is equal to the load current. The reduced switching
frequency helps increase light-load efficiency.
CCM/DCM
CLOCK2
PWM2
V CRS
VW
BOUNDARY
CLOCK3
PWM3
IL
VCRS1
VW
V CRS
VW LIGHT DCM
VCRS3
VCRS2
IL
FIGURE 8. R 3 ? MODULATOR OPERATION PRINCIPLES IN LOAD
INSERTION RESPONSE
V CRS
VW
DEEP DCM
Diode Emulation and Period Stretching
The ISL62771 can operate in diode emulation (DE) mode to
improve light-load efficiency. In DE mode, the low-side MOSFET
conducts when the current is flowing from source-to-drain and
does not allow reverse current, thus emulating a diode. Figure 9
shows that when LGATE is on, the low-side MOSFET carries current,
creating negative voltage on the phase node due to the voltage
drop across the ON-resistance. The ISL62771 monitors the current
by monitoring the phase node voltage. It turns off LGATE when the
phase node voltage reaches zero to prevent the inductor current
from reversing the direction and creating unnecessary power loss.
PHASE
UGATE
LGATE
IL
FIGURE 9. DIODE EMULATION
If the load current is light enough (see Figure 9), the inductor
current reaches and stays at zero before the next phase node
pulse, and the regulator is in discontinuous conduction mode
(DCM). If the load current is heavy enough, the inductor current
will never reach 0A, and the regulator is in CCM, although the
controller is in DE mode.
15
IL
FIGURE 10. PERIOD STRETCHING
Channel Configuration
Individual PWM channels of the Core VR can be disabled by
connecting the ISENx pin of the channel not required to +5V. For
example, placing the controller in a 1+1 configuration (see
Figure 5) requires ISEN2 of the Core VR to be tied to +5V. This
disables Channel 2 of the Core VR. ISEN1 must be tied through a
10k Ω resistor to GND to prevent this pin from pulling high and
disabling the channel. Connecting ISEN1 to +5V will disable the
Core VR output.
Power-On Reset
Before the controller has sufficient bias to guarantee proper
operation, the ISL62771 requires a +5V input supply tied to VDD
and VDDP to exceed the VDD rising power-on reset (POR)
threshold. Once this threshold is reached or exceeded, the
ISL62771 has enough bias to check the state of the SVI inputs
once ENABLE is taken high. Hysteresis between the rising and
the falling thresholds assure the ISL62771 does not
inadvertently turn off unless the bias voltage drops substantially
(see “Electrical Specifications” on page 11). Note that VIN must
be present for the controller to drive the output voltage.
FN8321.2
September 12, 2013
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL62771IRTZ-T | 功能描述:IC PWM CTRLR MULTIPHASE 40TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:Robust Ripple Regulator™ (R³) 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL62773 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multiphase PWM Regulator for AMD Fusiona?￠ Desktop CPUs Using SVI 2.0 |
| ISL62773HRZ | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL62773HRZ-T | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL62773IRZ | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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