参数资料
| 型号： | ISL6566CR |
| 厂商： | Intersil |
| 文件页数： | 18/29页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM BUCK 3PHASE 40-QFN |
| 标准包装： | 50 |
| 应用： | 控制器，Intel VRM9，VRM10，AMD Hammer 应用 |
| 输入电压： | 3 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 1.6 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 管件 |
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ISL6566
ISL6566 INTERNAL CIRCUIT
EXTERNAL CIRCUIT
VCC
SOFT-START
The soft-start function allows the converter to bring up the
output voltage in a controlled fashion, resulting in a linear
ramp-up. Following a delay of 16 PHASE clock cycles
POR
PVCC1
+ 12 V
between enabling the chip and the start of the ramp, the
output voltage progresses at a fixed rate of 12.5mV per each
16 PHASE clock cycles.
CIRCUIT
ENABLE
COMPARATOR
+
10.7k ?
ENLL
Thus, the soft-start period (not including the 16 PHASE clock
cycle delay) up to a given voltage, V DAC , can be
approximated by the following equation
V DAC ? 1280
T SS = ---------------------------------
-
1.40k ?
f S
(EQ. 13)
SOFT-START
AND
FAULT LOGIC
0.66V
where V DAC is the DAC-set VID voltage, and f S is the
switching frequency.
The ISL6566 also has the ability to start up into a pre-
charged output, without causing any unnecessary
disturbance. The FB pin is monitored during soft-start, and
FIGURE 11. POWER SEQUENCING USING THRESHOLD-
SENSITIVE ENABLE (ENLL) FUNCTION
2. The voltage on ENLL must be above 0.66V. The ENLL
input allows for power sequencing between the controller
bias voltage and another voltage rail. The enable
comparator holds the ISL6566 in shutdown until the
voltage at ENLL rises above 0.66V. The enable
comparator has 60mV of hysteresis to prevent bounce.
3. The driver bias voltage applied at the PVCC pins must
reach the internal power-on reset (POR) rising threshold.
In order for the ISL6566 to begin operation, PVCC1 is the
only pin that is required to have a voltage applied that
exceeds POR. However, for 2 or 3-phase operation
PVCC2 and PVCC3 must also exceed the POR
threshold. Hysteresis between the rising and falling
thresholds assure that once enabled, the ISL6566 will not
inadvertently turn off unless the PVCC bias voltage drops
substantially (see Electrical Specifications ).
4. The VID code must not be 111111 or 111110 in VRM10
should it be higher than the equivalent internal ramping
reference voltage, the output drives hold both MOSFETs off.
Once the internal ramping reference exceeds the FB pin
potential, the output drives are enabled, allowing the output
to ramp from the pre-charged level to the final level dictated
by the DAC setting. Should the output be pre-charged to a
level exceeding the DAC setting, the output drives are
enabled at the end of the soft-start period, leading to an
abrupt correction in the output voltage down to the DAC-set
level.
OUTPUT PRECHARGED
ABOVE DAC LEVEL
OUTPUT PRECHARGED
BELOW DAC LEVEL
mode or 11111 in AMD Hammer or VRM9 modes. These
codes signal the controller that no load is present. The
controller will enter shut-down mode after receiving either
of these codes and will execute soft-start upon receiving
any other code. These codes can be used to enable or
disable the controller but it is not recommended. After
receiving one of these codes, the controller executes a
2-cycle delay before changing the overvoltage trip level to
GND>
GND>
T1 T2
T3
V OUT (0.5V/DIV)
ENLL (5V/DIV)
the shut-down level and disabling PWM. Overvoltage
shutdown cannot be reset using one of these codes.
When each of these conditions is true, the controller
immediately begins the soft-start sequence.
18
FIGURE 12. SOFT-START WAVEFORMS FOR ISL6566-BASED
MULTI-PHASE CONVERTER
FN9178.4
March 9, 2006
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相关代理商/技术参数 |
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| ISL6566CRR5184 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6566CR-T | 功能描述:IC CTRLR PWM BUCK 3PHASE 40-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6566CRZ | 功能描述:IC CTRLR PWM BUCK 3PHASE 40QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6566CRZA | 制造商:Intersil Corporation 功能描述:CURRENT MODE PWM CNTRLR 0.8375V TO 1.6V 100A 40QFN EP - Rail/Tube |
| ISL6566CRZAR5184 | 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN 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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