参数资料
| 型号： | ISL6336ACRZ |
| 厂商： | Intersil |
| 文件页数： | 21/31页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 6PHASE BUCK 48-QFN |
| 标准包装： | 43 |
| 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： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（7x7） |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页
ISL6336, ISL6336A
Undervoltage Detection
EXTERNAL CIRCUIT
V CC
R VCC
IMON
ISL6336, ISL6336A
INTERNAL CIRCUIT
I AVG
The undervoltage threshold is set at 50% of the VID voltage.
When the output voltage at VSEN is below the undervoltage
threshold, VR_RDY gets pulled low. When the output voltage
comes back to 60% of the VID voltage, VR_RDY will return
back to high.
Overvoltage Protection
R IMON
C IMON
+
V IMON
-
Regardless of the VR being enabled or not, the ISL6336,
ISL6336A 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 before the
2nd soft-start, the OVP threshold is 1.275V. Once the
NEAR LOAD GND
FIGURE 11. IMON RESISTOR DIVIDER
Fault Monitoring and Protection
The ISL6336, ISL6336A 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 12
outlines the interaction between the fault monitors and the
VR_RDY signal.
VR_RDY
UV
50%
controller detects a valid VID input, the OVP trip point will be
changed to the VID voltage plus 175mV.
Two actions are taken by the ISL6336, ISL6336A to protect
the microprocessor load when an overvoltage condition
occurs.
At the inception of an overvoltage event, all PWM outputs
are commanded low instantly (in less than 20ns). This
causes the Intersil drivers to turn on the lower MOSFETs and
pull the output voltage down to avoid damaging the load.
When the voltage at VDIFF 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, the ISL6336, ISL6336A will again command the
lower MOSFETs to turn on. The ISL6336, ISL6336A 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 the ISL6336, ISL6336A is reset.
DAC
SOFT-START, FAULT
AND CONTROL LOGIC
-
OC
+
105μA
I AVG
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.
VDIFF
+
-
OV
-
OC
+
1.11V
I MON
Overcurrent Protection
ISL6336, ISL6336A has two levels of overcurrent protection.
Each phase is protected from a sustained overcurrent
condition by limiting its peak current, while the combined
VID + 0.175V
FIGURE 12. VR_RDY AND PROTECTION CIRCUITRY
VR_RDY Signal
The VR_RDY pin is an open-drain logic output to indicate
that the soft-start period is completed and the output voltage
is within the regulated range. VR_RDY is pulled low during
shutdown and releases high after a successful soft-start and
a fixed delay time, t D5 (see Figure 9). VR_RDY will be pulled
low when an undervoltage, overvoltage, or overcurrent
condition is detected, or if the controller is disabled by a
reset from EN_PWR, EN_VTT, POR, or VID OFF-code.
21
phase currents are protected on an instantaneous basis.
In instantaneous protection mode, the ISL6336, ISL6336A
utilizes the sensed average current I AVG to detect an
overcurrent condition. See “Channel-Current Balance” on
page 15 for more detail on how the average current is
measured. The average current is continually compared with
a constant 105μA reference current, as shown in Figure 12.
Once the average current exceeds the reference current, a
comparator trips and causes the converter to shutdown.
The voltage at the IMON pin is used for average current
protection (compared to the instantaneous current protection
described above). The current out of the 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
FN6504.1
May 28, 2009
相关PDF资料 |
PDF描述 |
|---|---|
| RSA24DRMH | CONN EDGECARD 48POS .125 SQ WW |
| 2512-182K | POWER INDUCTOR 1.8UH SMD |
| X40021S14-BT1 | IC VOLTAGE MONITOR DUAL 14-SOIC |
| HSC08DTES | CONN EDGECARD 16POS .100 EYELET |
| ISL6265CHRTZ-T | IC CTRLR MULTI-OUTPUT 48TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| P89LPC9351FDH | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable flash with 8-bit ADC |
| P89LPC9351FDH,518 | 功能描述:8位微控制器 -MCU Enhanced LPC935 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| P89LPC935FA | 制造商:NXP Semiconductors 功能描述:IC MCU 8BIT 80C51 8K FLASH PLCC28 |
| P89LPC935FA,129 | 功能描述:8位微控制器 -MCU 80C51 8K FL 768B RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| P89LPC935FA129 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 18MHZ LCC-28 |
发布紧急采购，3分钟左右您将得到回复。