参数资料
| 型号： | ISL62773IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 15/37页 |
| 文件大小： | 0K |
| 描述： | IC PWM REG MULTIPH AMD 48-QFN |
| 标准包装： | 4,000 |
| 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： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（6x6） |
| 包装： | 带卷 (TR) |
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ISL62773
VW
Figure 11 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
CLOCK2
COMP
window size and therefore is the same, making the inductor
current triangle the same in the three cases. The ISL62773 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
PWM2
CLOCK3
PWM3
VW
V CRS
IL
VW
BOUNDARY
VW LIGHT DCM
V CRS
VCRS1
VCRS3
VCRS2
FIGURE 9. R 3 ? MODULATOR OPERATION PRINCIPLES IN LOAD
INSERTION RESPONSE
Diode Emulation and Period Stretching
IL
V CRS
VW
DEEP DCM
The ISL62773 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 10
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 ISL62773 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 10. DIODE EMULATION
If the load current is light enough, as Figure 10 shows, 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 11. PERIOD STRETCHING
Channel Configuration
Individual PWM channels of either VR can be disabled by
connecting the ISENx pin of the channel not required to +5V. For
example, placing the controller in a 2+1 configuration (Figure 5),
requires ISEN3 of the Core VR and ISEN2 of the Northbridge VR
to be tied to +5V. This disables Channel 3 of the Core VR and
Channel 2 of the Northbridge VR. ISEN1_NB must be tied through
a 10k ? resistor to GND to prevent this pin from pulling high and
disabling the channel. Connecting ISEN1 or ISEN1_NB to +5V will
disable the corresponding VR output. This feature allows debug
of individual VR outputs.
Power-On Reset
Before the controller has sufficient bias to guarantee proper
operation, the ISL62773 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
ISL62773 has enough bias to check the state of the SVI inputs
once ENABLE is taken high. Hysteresis between the rising and
the falling threshold on VDD POR assure the ISL62773 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.
March 7, 2012
FN8263.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6277A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multiphase PWM Regulator for AMD Fusion Mobile CPUs Using SVI 2.0 |
| ISL6277AHRZ | 制造商:Intersil Corporation 功能描述:MULTI-OUTPUT CONTROLLER FOR AMD FUSION UP, 6X6 QFN - Rail/Tube 制造商:Intersil Corporation 功能描述:IC PWM REG MULTIPH AMD 48-QFN 制造商:Intersil 功能描述:PWM Regulator for AMD Fusion |
| ISL6277AHRZ-T | 制造商:Intersil Corporation 功能描述:MULTI-OUTPUT CONTROLLER FOR AMD FUSION UP, 6X6 QFN, T&R - Tape and Reel 制造商:Intersil Corporation 功能描述:IC PWM REG MULTIPH AMD 48-QFN 制造商:Intersil 功能描述:PWM Regulator --- for AMD Fusion--- |
| ISL6277AIRZ | 功能描述:电流型 PWM 控制器 Multi-output Controller for AMD fusion uP, 6X6 QFN 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 |
| ISL6277AIRZ-T | 功能描述:电流型 PWM 控制器 Multi-output Controller for AMD fusion uP, 6X6 QFN, T&R 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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