参数资料
| 型号： | ISL6277IRZ |
| 厂商： | Intersil |
| 文件页数： | 21/37页 |
| 文件大小： | 0K |
| 描述： | IC PWM REG MULTIPH AMD 48-QFN |
| 标准包装： | 50 |
| 应用： | 控制器，AMD Fusion? SVI 2.0 CPU GPU |
| 输入电压： | 4.5 V ~ 25 V |
| 输出数： | 2 |
| 输出电压： | 0.006 V ~ 1.55 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（6x6） |
| 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页第32页第33页第34页第35页第36页第37页
ISL6277
Floating DriverX & PWM_Y Configuration
The ISL6277 allows for one internal driver and one PWM output
to be configured to opposite VRs depending on the desired
configuration of the Northbridge VR. Internal DriverX can be used
as Channel 1 of the Northbridge VR with PWM_Y used for
Channel 3 of the Core VR. Using this partitioning, a 2+1 or 1+1
configured ISL6277 would not require an external driver.
If routing of the driver signals would be a cause of concern due to
having an internal driver on the Northbridge VR, then the
ISL6277 can be configured to use PWM_Y as Channel 1 on the
Northbridge VR. DriverX would then be used as Channel 3 of the
Core VR. This allows the placement of the external drivers for the
Northbridge VR to be closer to the output stage(s) depending on
the number of active Phases, providing placement and layout
flexibility to the Northbridge VR.
frequency is not absolutely constant due to the nature of the R 3 ?
insertion and decreases during load release to achieve fast
response. Thus, the switching frequency is relatively constant at
steady state. Variation is expected when the power stage
condition, such as input voltage, output voltage, load, etc.
changes. The variation is usually less than 10% and does not
have any significant effect on output voltage ripple magnitude.
Table 5 defines the switching frequency based on the resistor
values used to program the COMP_NB and FCCM_NB pins. Use
the previous tables related to COMP_NB and FCCM_NB to
determine the correct resistor value in these ranges to program
the desired output offset, Slew Rate and DriverX/PWM_Y
configuration.
TABLE 5. SWITCHING FREQUENCY SELECTION
TABLE 4. FCCM_NB RESISTOR SELECTION
SLEW RATE FOR CORE
FREQUENCY
[kHz]
COMP_NB
RANGE [k ? ]
FCCM_NB
RANGE [k ? ]
RESISTOR VALUE
[ k ? ]
AND NORTHBRIDGE
[mV/μs]
DriverX
PWM_Y
300
57.6 to OPEN
21.0 to 41.2
or
5.62
20
154 to OPEN
9.53
13.3
15
12.5
350
5.62 to 41.2
21.0 to 41.2
or
154 to OPEN
16.9
21.0
26.7
10
20
15
Core VR
Channel 3
NB VR
Channel 1
400
450
57.6 to OPEN
5.62 to 41.2
5.62 to 16.9
or
57.6 to 121
5.62 to 16.9
34.0
41.2
57.6
73.2
12.5
10
20
15
or
57.6 to 121
The controller monitors SVI commands to determine when to
enter power-saving mode, implement dynamic VID changes, and
shut down individual outputs.
95.3
121
154
182
221
OPEN
12.5
10
20
15
12.5
10
NB VR
Channel 1
Core VR
Channel 3
AMD Serial VID Interface 2.0
The on-board Serial VID Interface 2.0 (SVI 2) circuitry allows the
AMD processor to directly control the Core and Northbridge
voltage reference levels within the ISL6277. Once the PWROK
signal goes high, the IC begins monitoring the SVC and SVD pins
for instructions. The ISL6277 uses a digital-to-analog converter
(DAC) to generate a reference voltage based on the decoded SVI
value. See Figure 12 for a simple SVI interface timing diagram.
VID-on-the-Fly Slew Rate Selection
The FCCM_NB resistor is also used to select the slew rate for VID
changes commanded by the processor. Once selected, the slew
rate is locked in during soft-start and is not adjustable during
operation. The lowest slew rate which can be selected is
10mV/μs which is above the minimum of 7.5mV/μs required by
the SVI2 specification. The slew rate selected sets the slew rate
for both Core and Northbridge VRs; they cannot be independently
Pre-PWROK Metal VID
Typical motherboard start-up begins with the controller decoding
the SVC and SVD inputs to determine the pre-PWROK Metal VID
setting (see Table 6). Once the ENABLE input exceeds the rising
threshold, the ISL6277 decodes and locks the decoded value into
an on-board hold register.
TABLE 6. PRE-PWROK METAL VID CODES
selected.
CCM Switching Frequency
The Core and Northbridge VR switching frequency is set by the
programming resistors on COMP_NB and FCCM_NC. When the
ISL6277 is in continuous conduction mode (CCM), the switching
21
SVC
0
0
1
1
SVD
0
1
0
1
OUTPUT VOLTAGE (V)
1.1
1.0
0.9
0.8
FN8270.1
March 8, 2012
相关PDF资料 |
PDF描述 |
|---|---|
| HCC22DRXN | CONN EDGECARD 44POS DIP .100 SLD |
| ISL62773HRZ | IC PWM REG MULTIPH AMD 48-QFN |
| 400MXC390MEFCSN30X45 | CAP ALUM 390UF 400V 20% SNAP-IN |
| X40030V14I-A | IC VOLTAGE MONITOR TRPL 14-TSSOP |
| HCC22DRXH | CONN EDGECARD 44POS DIP .100 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6277IRZ-T | 功能描述:IC PWM REG MULTIPH AMD 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 |
| ISL62810AHRUZ-T | 制造商:Intersil Corporation 功能描述:0/2-BIT PWM GPU CONTROLLER FOR NOTEBOOK. 20 LD 3.2 X 1.8 UTQ - Tape and Reel 制造商:Intersil 功能描述:0/2 BIT PWM GPU CONTLR FOR NOTEBOOK |
| ISL62810HRUZ-T | 制造商:Intersil Corporation 功能描述:0/2-BIT PWM GPU CONTROLLER FOR NOTEBOOK. 16LD 2.6 X 1.8 UTQF - Tape and Reel 制造商:Intersil 功能描述:0/2 BIT PWM GPU CONTLR FOR NOTEBOOK |
| ISL62870 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:PWM DC/DC Voltage Regulator Controller |
| ISL62870HRUZ | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:PWM DC/DC Voltage Regulator Controller |
发布紧急采购，3分钟左右您将得到回复。