参数资料
| 型号： | ISL6554CB-T |
| 厂商： | Intersil |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM CORE VOLTAGE REG 20-SOIC |
| 标准包装： | 1,000 |
| 应用： | 控制器，Intel Itanium? |
| 输入电压： | 4.75 V ~ 5.25 V |
| 输出数： | 4 |
| 输出电压： | 0.95 V ~ 1.7 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 带卷 (TR) |
ISL6554
time. PGOOD also goes “low” during this time due to VSEN
going below its threshold voltage. To lower the average
TABLE 1. VOLTAGE IDENTIFICATION CODES (Continued)
VOLTAGE IDENTIFICATION CODE AT
output dissipation, the soft-start initial wait time is increased
from 32 to 2048 cycles, then the soft-start ramp is initiated.
VID4
PROCESSOR PINS
VID3 VID2 VID1
VID0
VCC CORE
(V DC )
At a PWM frequency of 200kHz, for instance, an overcurrent
detection would cause a dead time of 10.24ms, then a ramp
of 10.08ms.
At the end of the delay, PWM outputs are restarted and the
soft-start ramp is initiated. If a short is present at that time,
the cycle is repeated. This is the hiccup mode.
Figure 6 shows the supply shorted under operation and the
hiccup operating mode described above. Note that due to
the high short circuit current, overcurrent is detected before
completion of the start-up sequence so the delay is not quite
as long as the normal soft-start cycle.
SHORT APPLIED HERE
PGOOD
SHORT
CURRENT
50A/DIV.
HICCUP MODE. SUPPLY POWERED BY ATX SUPPLY
CORE LOAD CURRENT = 31A, 5V LOAD = 5A
SUPPLY FREQUENCY = 200kHz, V IN = 12V
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1.150
1.175
1.200
1.225
1.250
1.275
1.300
1.325
1.350
1.375
1.400
1.425
1.450
1.475
1.500
1.525
1.550
1.575
1.600
1.625
1.650
1.675
1.700
ATX SUPPLY ACTIVATED BY ATX “PS-ON PIN”
FIGURE 6. SHORT APPLIED TO SUPPLY AFTER POWER-UP
CORE Voltage Programming
The voltage identification pins (VID0, VID1,VID2,VID3 and
VID4) set the CORE output voltage. Each VID pin is pulled to
VCC by an internal 20 μ A current source and accepts open-
collector/open-drain/open-switch-to-ground or standard low-
voltage TTL or CMOS signals.
Table 1 shows the nominal DAC voltage as a function of the
VID codes. The power supply system is ± 1% accurate over
the operating temperature and voltage range.
TABLE 1. VOLTAGE IDENTIFICATION CODES
VOLTAGE IDENTIFICATION CODE AT
Current Sensing and Balancing
Overview
The ISL6554 samples the on-state voltage drop across each
synchronous rectifier MOSFET, Q2, as an indication of the
inductor current in that phase (see Figure 7). Neglecting AC
effects (to be discussed later), the voltage drop across Q2 is
simply r DS(ON) (Q2) x inductor current (I L ). Note that I L , the
inductor current, is either 1/2, 1/3, or 1/4 of the total current
(I LT ), depending on how many phases are in use.
The voltage at Q2’s drain, the PHASE node, is applied to the
R ISEN resistor to develop the I ISEN current to the ISL6554
ISEN pin. This pin is held at virtual ground, so the current
through R ISEN is I L x r DS(ON) (Q2) / R ISEN .
VID4
PROCESSOR PINS
VID3 VID2 VID1
VID0
VCC CORE
(V DC )
The I ISEN current provides information to perform the
following functions:
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
0
0
0
0
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Output Off
0.95
0.975
1.000
1.025
1.050
1.075
1.100
1.125
1. Detection of an overcurrent condition
2. Balance the I L currents in multiple channels
Overcurrent, Selecting RISEN
The current detected through the R ISEN resistor is
averaged with the current(s) detected in the other 1, 2, or 3
channels. The averaged current is compared with a
trimmed, internally generated current, and used to detect
an overcurrent condition.
10
FN9003.3
February 11, 2005
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| ISL6554CB-TR5165 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6554CBZ | 功能描述:IC PWM CORE VOLTAGE REG 20-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6554CBZA | 功能描述:IC PWM CORE VOLTAGE REG 20-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6554CBZA-T | 功能描述:IC PWM CORE VOLTAGE REG 20-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6554CBZ-T | 功能描述:IC PWM CORE VOLTAGE REG 20-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
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