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| 型号： | ISL6327CRZ-T |
| 厂商： | Intersil |
| 文件页数： | 18/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 48-QFN |
| 标准包装： | 4,000 |
| PWM 型： | 控制器 |
| 输出数： | 6 |
| 频率 - 最大： | 1MHz |
| 占空比： | 25% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL6327
FB
Enable and Disable
While in shutdown mode, the PWM outputs are held in a
high-impedance state to assure the drivers remain off. The
following input conditions must be met before the ISL6327 is
E/A
DYNAMIC
VID D/A
DAC
R REF
REF
VCC
OR
GND
released from shutdown mode.
1. The bias voltage applied at VCC must reach the internal
power-on reset (POR) rising threshold. Once this
threshold is reached, proper operation of all aspects of
the ISL6327 is guaranteed. Hysteresis between the rising
and falling thresholds assure that once enabled, the
ISL6327 will not inadvertently turn off unless the bias
voltage drops substantially (see “Electrical
Specifications” on page 6).
2. The ISL6327 features an enable input (EN_PWR) for
power sequencing between the controller bias voltage and
another voltage rail. The enable comparator holds the
1.6V
-
+
+
R OFS
ISL6327 in shutdown until the voltage at EN_PWR rises
above 0.875V. The enable comparator has about 130mV
of hysteresis to prevent bounce. It is important that the
VCC
0.4V
-
GND
ISL6327
OFS
driver ICs reach their POR level before the ISL6327
becomes enabled. The schematic in Figure 7
demonstrates sequencing the ISL6327 with the ISL66xx
family of Intersil MOSFET drivers, which require 12V bias.
FIGURE 6. OUTPUT VOLTAGE OFFSET PROGRAMMING
Dynamic VID
Modern microprocessors need to make changes to their core
voltage as part of the normal operation. They direct the core
3. The voltage on EN_VTT must be higher than 0.875V to
enable the controller. This pin is typically connected to the
output of VTT VR.
ISL6327 INTERNAL CIRCUIT EXTERNAL CIRCUIT
voltage regulator to do this by making changes to the VID
inputs during the regulator operation. The power management
VCC
+ 12 V
solution is required to monitor the DAC inputs and respond to
on-the-fly VID changes in a controlled manner. Supervising
the safe output voltage transition within the DAC range of the
processor without discontinuity or disruption is a necessary
function of the core-voltage regulator.
In order to ensure the smooth transition of output voltage
POR
CIRCUIT
ENABLE
COMPARATOR
+
-
0.875V
10k Ω
EN_PWR
910 Ω
during VID change, a VID step change smoothing network,
composed of R REF and C REF , can be used. The selection of
R REF is based on the desired offset voltage as detailed in
selection of C REF is based on the time duration for 1 bit VID
change and the allowable delay time.
Assuming the microprocessor controls the VID change at 1-bit
every T VID , the relationship between the time constant of
R REF and C REF network and T VID is given by Equation 13.
(EQ. 13)
C REF R REF = T VID
SOFT-START
AND
FAULT LOGIC
+
-
0.875V
EN_VTT
FIGURE 7. POWER SEQUENCING USING THRESHOLD-
Operation Initialization
Prior to converter initialization, proper conditions must exist on
the enable inputs and VCC. When the conditions are met, the
controller begins soft-start. Once the output voltage is within
the proper window of operation, VR_RDY asserts logic high.
18
SENSITIVE ENABLE (EN) FUNCTION
When all conditions above are satisfied, ISL6327 begins the
soft-start and ramps the output voltage to 1.1V first. After
remaining at 1.1V for some time, ISL6327 reads the VID
code at VID input pins. If the VID code is valid, ISL6327 will
regulate the output to the final VID setting. If the VID code is
OFF code, ISL6327 will shut down, and cycling VCC,
EN_PWR or EN_VTT is needed to restart.
FN9276.4
May 5, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6327IRZ | 功能描述:IC REG CTRLR BUCK PWM 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6327IRZ-T | 功能描述:IC REG CTRLR BUCK PWM 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6328ACRZ | 功能描述:IC VOLTAGE REGULATOR RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:* 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 |
| ISL6328ACRZ-T | 功能描述:IC VOLTAGE REGULATOR RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:* 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 |
| ISL6328AIRZ | 功能描述:IC VOLTAGE REGULATOR RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:* 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 |
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