参数资料
| 型号： | ISL6324IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 20/38页 |
| 文件大小： | 0K |
| 描述： | IC HYBRID CTRLR PWM DUAL 48-QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，AMD SVI |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 2 |
| 输出电压： | 最高 2V |
| 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： | 带卷 (TR) |
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ISL6324
Power-On Reset
The ISL6324 requires VCC, PVCC1_2, and PVCC_NB
inputs to exceed their rising POR thresholds before the
ISL6324 has sufficient bias to guarantee proper operation.
The bias voltage applied to VCC must reach the internal
power-on reset (POR) rising threshold. Once this threshold
is reached, the ISL6324 has enough bias to begin checking
the driver POR inputs, EN, and channel detect portions of
the initialization cycle. Hysteresis between the rising and
falling thresholds assure the ISL6324 will not advertently
turn off unless the bias voltage drops substantially (see
“Electrical Specifications” on page 6).
The bias voltage applied to the PVCC1_2 and PVCC_NB
pins power the internal MOSFET drivers of each output
channel. In order for the ISL6324 to begin operation, both
PVCC inputs must exceed their POR rising threshold to
guarantee proper operation of the internal drivers.
Hysteresis between the rising and falling thresholds assure
that once enabled, the ISL6324 will not inadvertently turn off
unless the PVCC bias voltage drops substantially (see
“Electrical Specifications” on page 6). Depending on the
number of active CORE channels determined by the Phase
Detect block, the external driver POR checking is supported
by the Enable Comparator.
Enable Comparator
The ISL6324 features a dual function enable input (EN) for
enabling the controller and power sequencing between the
controller and external drivers or another voltage rail. The
enable comparator holds the ISL6324 in shutdown until the
voltage at EN rises above 0.86V. The enable comparator has
about 110mV of hysteresis to prevent bounce. It is important
that the driver ICs reach their rising POR level before the
ISL6324 becomes enabled. The schematic in Figure 10
demonstrates sequencing the ISL6324 with the ISL66xx
family of Intersil MOSFET drivers, which require 12V bias.
When selecting the value of the resistor divider the driver
maximum rising POR threshold should be used for
calculating the proper resistor values. This will prevent
improper sequencing events from creating false trips during
soft-start.
Phase Detection
The ISEN3- and ISEN4- pins are monitored prior to soft-start
to determine the number of active CORE channel phases.
If ISEN4- is tied to VCC, the controller will configure the
channel firing order and timing for 3-phase operation. If
ISEN3- and ISEN4- are tied to VCC, the controller will set
the channel firing order and timing for 2-phase operation
(see “PWM Operation” on page 13). If Channel 4 and/or
Channel 3 are disabled, then the corresponding PWMn and
ISENn+ pins may be left unconnected
Soft-Start Output Voltage Targets
Once the POR and Phase Detect blocks and enable
comparator are satisfied, the controller will begin the
soft-start sequence and will ramp the CORE and NB output
voltages up to the SVI interface designated target level if the
controller is set SVI mode. If set to PVI mode, the North
Bridge regulator is disabled and the core is soft started to the
level designated by the parallel VID code.
SVI MODE
Prior to soft-starting both CORE and NB outputs, the
ISL6324 must check the state of the SVI interface inputs to
determine the correct target voltages for both outputs. When
the controller is enabled, the state of the VFIXEN, SVD and
SVC inputs are checked and the target output voltages set
for both CORE and NB outputs are set by the DAC (see
only change if the EN signal is pulled low or after a POR
reset of VCC.
Soft-Start
The soft-start sequence is composed of three periods, as
shown in Figure 11. At the beginning of soft-start, the DAC
immediately obtains the output voltage targets for both
outputs by decoding the state of the SVI or PVI inputs. A
100μs fixed delay time, TDA, proceeds the output voltage
rise. After this delay period the ISL6324 will begin ramping
both CORE and NB output voltages to the programmed DAC
level at a fixed rate of 3.25mV/μs. The amount of time
required to ramp the output voltage to the final DAC voltage
is referred to as TDB, and can be calculated as shown in
Equation 17.
V DAC
3.25 × 10
If the controller is configured for 2-phase CORE operation,
then the resistor divider can be used for sequencing the
controller with another voltage rail. The resistor divider to EN
should be selected using a similar approach as the previous
driver discussion.
The EN pin is also used to force the ISL6324 into either PVI
or SVI mode. The mode is set upon the rising edge of the EN
signal. When the voltage on the EN pin rises above 0.86V,
the mode will be set depending upon the status of the
VID1/SEL pin.
TDB = ------------------------------
– 3
After the DAC voltage reaches the final VID setting,
VDDPWRGD will be set to high.
(EQ. 17)
20
FN6518.2
September 25, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6326AIRZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6326BCRZ | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM 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 |
| ISL6326BCRZ-T | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM 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 |
| ISL6326BIRZ | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR IND 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 |
| ISL6326BIRZ-T | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR IND 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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