参数资料
| 型号： | ISL8101CRZ |
| 厂商： | Intersil |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTRLR BUCK 2PHASE 24-QFN |
| 标准包装： | 75 |
| 应用： | 控制器，Intel VRM9，VRM10，AMD Hammer 应用 |
| 输入电压： | 4.6 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 2.3 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN（4x4） |
| 包装： | 管件 |
ISL8101
drive turns the freewheeling element off. The upper
MOSFET is kept on until the clock signals the beginning of
the next switching cycle and the PWM pulse is terminated.
CURRENT SENSING
The ISL8101 accommodates three different DAC ranges:
ISL8101 senses current by sampling the voltage across the
lower MOSFET during its conduction interval. MOSFET
r DS(ON) sensing is a no-added-cost method to sense current
for channel current balance and overcurrent protection.
The PHASE pins are used as inputs for each channel.
Internal circuitry samples the lower MOSFETs’ r DS(ON)
voltage, once each cycle, during their conduction periods
and time multiplexes the sampled voltages across the ISEN
resistor. The current that is thus developed through the ISEN
resistor is duplicated and used for channel current balancing
and overcurrent detection.
CHANNEL-CURRENT BALANCE
Another benefit of multiphase operation is the thermal
advantage gained by distributing the dissipated heat over
multiple devices and greater area. By doing this, the
designer avoids the complexity of driving multiple parallel
MOSFETs and the expense of using expensive heat sinks
and exotic magnetic materials.
In order to fully realize the thermal advantage, it is important
that each channel in a multiphase converter be controlled to
deliver about the same current at any load level. Intersil
multiphase controllers ensure current balance by comparing
each channel’s current to the average current delivered by
all channels and making appropriate adjustments to each
channel’s pulse width based on the error. The error signal
modifies the pulse width to correct any unbalance and force
the error toward zero.
OVERCURRENT PROTECTION
The individual channel currents, as sensed via the PHASE
OUTPUT CURRENT
OUTPUT VOLTAGE
FIGURE 4. OVERCURRENT BEHAVIOR IN HICCUP MODE
OUTPUT VOLTAGE SETTING
The ISL8101 uses a digital to analog converter (DAC) to
generate a reference voltage based on the logic signals at the
VID pins. The DAC decodes the 5 or 6-bit logic signals into
one of the discrete voltages shown in Tables 1, 2 and 3. Each
VID pin is pulled up to an internal 1.2V voltage by weak
current sources (about 45μA current, decreasing to 0 as the
voltage at the VID pins varies from 0 to the internal 1.2V pull-
up voltage). External pull-up resistors or active-high output
stages can augment the pull-up current sources, up to a
voltage of 5V.
.
Intel VRM9.0, AMD Hammer, or Intel VRM10.0. See
connections for desired DAC range compatibility.
TABLE 1. AMD HAMMER VOLTAGE IDENTIFICATION CODES
pins and scaled via the ISEN resistor, are continuously
monitored and compared with an internal 95μA reference
current. If both channels’ currents exceed, at any time, the
reference current, the overcurrent comparator triggers an
overcurrent event. Similarly, an OC event is also triggered if
either channel’s current exceeds the 95μA reference for 7
consecutive switching cycles.
As a result of an OC event, output drives on both channels
turn off both upper and lower MOSFETs. The system then
waits in this state for a period of 4096 switching clock cycles.
The wait period is followed by a soft-start attempt . If the
soft-start attempt is successful, operation continues as
normal. Should the soft-start attempt fail, the ISL8101
repeats the 2048-cycle wait period and follows with another
soft-start attempt. This hiccup mode of operation continues
indefinitely (as depicted in Figure 4) for as long as the
controller is enabled or until the overcurrent condition is
removed.
VID4
1
1
1
1
1
1
1
1
1
1
1
1
1
VID3
1
1
1
1
1
1
1
1
0
0
0
0
0
VID2
1
1
1
1
0
0
0
0
1
1
1
1
0
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
VDAC
Off
0.800
0.825
0.850
0.875
0.900
0.925
0.950
0.975
1.000
1.025
1.050
1.075
9
FN9223.1
July 28, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL8101CRZ-T | 功能描述:电压模式 PWM 控制器 W/ANNEAL P6 TWO PHS W/INT DRVRS GEN PURP RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL8101EVAL1 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Two-Phase Multiphase Buck PWM Controller with Integrated MOSFET Drivers |
| ISL8101IRZ | 功能描述:电压模式 PWM 控制器 W/ANNEAL P6 TWO PHS W/INT DRVRS GEN PURP RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL8101IRZ-T | 功能描述:电压模式 PWM 控制器 W/ANNEAL P6 TWO PHS W/INT DRVRS GEN PURP RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL8102 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Two-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers |
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