参数资料
| 型号： | ISL6334CRZ |
| 厂商： | Intersil |
| 文件页数： | 21/31页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE BUCK 40-QFN |
| 标准包装： | 50 |
| 应用： | 控制器，Intel VR11.1 |
| 输入电压： | 3 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.5 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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ISL6334, ISL6334A
ISL6334, ISL6334A INTERNAL CIRCUIT
EXTERNAL CIRCUIT
VCC
+ 12 V
VOUT, 500mV/DIV
POR
CIRCUIT
ENABLE
COMPARATOR
100k Ω
+
EN_PWR
t D1
t D2
t D3 t D4
t D5
-
9.1k Ω
EN_VTT
0.875V
VR_RDY
SOFT-START
AND
FAULT LOGIC
+
-
0.875V
EN_VTT
500μs/DIV
FIGURE 9. SOFT-START WAVEFORMS
Current Sense Output
The current flowing out of the IMON pin is equal to the
sensed average current inside ISL6334, ISL6334A. In typical
applications, a resistor is placed from the IMON pin to GND
to generate a voltage, which is proportional to the load
current and the resistor value, as shown in Equation 17:
V IOUT = ------------------- ------------------ I LOAD
R ISEN
FIGURE 8. POWER SEQUENCING USING THRESHOLD-
N
R IOUT R X
(EQ. 17)
SENSITIVE ENABLE (EN) FUNCTION
where V IMON is the voltage at the IMON pin, R IMON is the
The soft-start time is the sum of the 4 periods as shown in
Equation 14.
resistor between the IMON pin and GND, I LOAD is the total
output current of the converter, R ISEN is the sense resistor
t SS = t D1 + t D2 + t D3 + t D4
(EQ. 14)
connected to the ISEN+ pin, N is the active channel number,
and R X is the DC resistance of the current sense element,
t D1 is a fixed delay with the typical value as 1.36ms. t D3 is
determined by the fixed 85μs plus the time to obtain valid
VID voltage. If the VID is valid before the output reaches the
1.1V, the minimum time to validate the VID input is 500ns.
Therefore, the minimum t D3 is about 86μs.
During t D2 and t D4 , ISL6334, ISL6334A digitally controls the
DAC voltage change at 6.25mV per step. The time for each
step is determined by the frequency of the soft-start
oscillator, which is defined by the resistor R SS from SS pin to
GND. The second soft-start ramp time t D2 and t D4 can be
calculated based on Equations 15 and 16:
either the DCR of the inductor or R SENSE depending on the
sensing method.
The resistor from the IMON pin to GND should be chosen to
ensure that the voltage at the IMON pin is less than 1.11V
under the maximum load current. If the IMON pin voltage is
higher than 1.11V, overcurrent shutdown will be triggered, as
A small capacitor can be placed between the IMON pin and
GND to reduce the noise impact. If this pin is not used, tie it
to GND.
t D2 = ------------------------ ( μ s )
t D4 = ------------------------------------------------ ( μ s )
1.1xR SS
6.25x25
( V VID – 1.1 ) xR SS
6.25x25
(EQ. 15)
(EQ. 16)
Fault Monitoring and Protection
The ISL6334, ISL6334A actively monitors output voltage and
current to detect fault conditions. Fault monitors trigger
protective measures to prevent damage to a microprocessor
load. One common power-good indicator is provided for linking
For example, when VID is set to 1.5V and the R SS is set at
100k Ω , the first soft-start ramp time t D2 will be 704μs and the
second soft-start ramp time t D4 will be 256μs.
After the DAC voltage reaches the final VID setting,
VR_RDY will be set to high with the fixed delay t D5 . The
typical value for t D5 is 85μs. Before the VR_RDY is
released, the controller disregards the PSI# input and
always operates in normal CCM PWM mode.
21
to external system monitors. The schematic in Figure 10
outlines the interaction between the fault monitors and the
VR_RDY signal.
VR_RDY Signal
The VR_RDY pin is an open-drain logic output which
indicates that the soft-start period has completed and the
output voltage is within the regulated range. VR_RDY is
pulled low during shutdown and releases high after a
FN6482.2
February 1, 2013
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| ISL6334CRZ-T | 功能描述:IC CTRLR PWM 4PHASE 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 |
| ISL6334DCRZ | 功能描述:IC CTRLR PWM 4PHASE VR11.1 40QFN 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 |
| ISL6334DCRZ-T | 功能描述:IC CTRLR PWM 4PHASE VR11.1 40QFN 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 |
| ISL6334DIRZ | 功能描述:IC CTRLR PWM 4PHASE VR11.1 40QFN 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 |
| ISL6334DIRZ-T | 功能描述:IC CTRLR PWM 4PHASE VR11.1 40QFN 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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