参数资料
| 型号： | ISL6334DIRZ |
| 厂商： | Intersil |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE VR11.1 40QFN |
| 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： | -40°C ~ 85°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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ISL6334D
Fault Monitoring and Protection
The ISL6334D 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 to external
system monitors. The schematic in Figure 10 outlines the
interaction between the fault monitors and the VR_RDY signal.
VR_RDY Signal
UV
50%
VR_RDY
The VR_RDY pin is an open-drain logic output which
indicates that the soft-start period is complete and the output
voltage is within the regulated range. VR_RDY is pulled low
DAC
SOFT-START, FAULT
AND CONTROL LOGIC
+
OC
-
105μA
I AVG
during shutdown and releases high after a successful soft-
start and a fixed delay t D5 . VR_RDY will be pulled low when
an undervoltage or overvoltage condition is detected, or the
controller is disabled by a reset from EN_PWR, EN_VTT,
VDIFF
+
-
OV
+
OC
-
1.11V
IMON
POR, or VID OFF-code.
Undervoltage Detection
The undervoltage threshold is set at 50% of the VID code.
When the output voltage at VSEN is below the undervoltage
threshold, VR_RDY is pulled low.
Overvoltage Protection
Regardless of the VR being enabled or not, the ISL6334D
overvoltage protection (OVP) circuit will be active after its
POR. The OVP thresholds are different under different
operation conditions. When VR is not enabled and during
the soft-start intervals t D1 , t D2 and t D3 , the OVP threshold is
1.273V. Once the controller detects valid VID input, the OVP
trip point will be changed to DAC plus 175mV.
Two actions are taken by ISL6334D to protect the
microprocessor load when an overvoltage condition occurs.
At the inception of an overvoltage event, all PWM outputs
are commanded low instantly (less than 20ns). This causes
the Intersil drivers to turn on the lower MOSFETs and pull
the output voltage below a level to avoid damaging the load.
When the VDIFF voltage falls below the DAC plus 75mV,
PWM signals enter a high-impedance state. The Intersil
drivers respond to the high-impedance input by turning off
both upper and lower MOSFETs. If the overvoltage condition
reoccurs, ISL6334D will again command the lower
MOSFETs to turn on. The ISL6334D will continue to protect
the load in this fashion as long as the overvoltage condition
occurs.
Once an overvoltage condition is detected, normal PWM
operation ceases until ISL6334D is reset. Cycling the
voltage on EN_PWR, EN_VTT or VCC below the
POR-falling threshold will reset the controller. Cycling the
VID codes will not reset the controller.
19
VID + 0.175V
FIGURE 10. VR_RDY AND PROTECTION CIRCUITRY
Overcurrent Protection
The ISL6334D has two levels of overcurrent protection.
Each phase is protected from a sustained overcurrent
condition by limiting its peak current, while the combined
phase currents are protected on an instantaneous basis.
In instantaneous protection mode, ISL6334D utilizes the
sensed average current I AVG to detect an overcurrent
condition. See “Voltage Regulation” on page 13 for more
details on how the average current is measured. The
average current is continually compared with a constant
105μA reference current, as shown in Figure 10. Once the
average current exceeds the reference current, a
comparator triggers the converter to shutdown.
The current out of IMON pin is equal to the sensed average
current I AVG . With a resistor from IMON to GND, the voltage
at IMON will be proportional to the sensed average current
and the resistor value. The ISL6334D continuously monitors
the voltage at IMON pin. If the voltage at IMON pin is higher
than 1.11V, a comparator triggers the overcurrent shutdown.
By increasing the resistor between IMON and GND, the
overcurrent protection threshold can be adjusted to be less
than 105μA. For example, the overcurrent threshold for the
sensed average current I AVG can be set to 95μA by using a
11.8k Ω resistor from IMON to GND.
At the beginning of overcurrent shutdown, the controller
places all PWM signals in a high-impedance state within
20ns, commanding the Intersil MOSFET driver ICs to turn off
both upper and lower MOSFETs. The system remains in this
state a period of 4096 switching cycles. If the controller is still
enabled at the end of this wait period, it will attempt a
soft-start. If the fault remains, the trip-retry cycles will
continue indefinitely (as shown in Figure 11) until either
controller is disabled or the fault is cleared. Note that the
FN6802.3
November 22, 2013
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相关代理商/技术参数 |
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| 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 |
| ISL6334IRZ | 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 |
| ISL6334IRZ-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 |
| ISL6336ACRZ | 功能描述:IC CTRLR PWM 6PHASE BUCK 48-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 |
| ISL6336ACRZ-T | 功能描述:IC CTRLR PWM 6PHASE BUCK 48-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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