参数资料
| 型号： | ISL8101IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTRLR BUCK 2PHASE 24-QFN |
| 标准包装： | 6,000 |
| 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： | -40°C ~ 85°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： | 带卷 (TR) |
ISL8101
Operation
The ISL8101 employs simple voltage-mode control. Figure 1
shows a simplified diagram of the voltage regulation and
current balance loops. Voltage feedback is used to precisely
regulate the output voltage, while current feedback tightly
controls the individual channel currents, I L1 and I L2 , and
trips the OC protection, if so necessary.
VOLTAGE LOOP
Feedback from the output voltage is applied via resistor R 1
to the inverting input of the Error Amplifier. This signal can
drive the Error Amplifier output either high or low, depending
upon the output voltage. Low output voltage makes the
amplifier output move towards a higher output voltage level.
Amplifier output voltage is applied to the positive inputs of
the PWM Circuit comparators via the channel current
correction summing networks. Out-of-phase sawtooth
signals are applied to the two PWM comparators inverting
inputs. Increasing Error Amplifier voltage results in increased
Comparator output duty cycle. This increased duty cycle
signal is passed through the output drivers with no phase
reversal to drive the external upper MOSFETs. Increased
duty cycle or ON time for the upper MOSFET transistors
results in increased output voltage to compensate for the low
output voltage sensed.
CHANNEL BALANCE CURRENT LOOP
The current balance control loop works in a similar fashion to
the voltage control loop, but with current control information
applied individually to each channel’s PWM circuit. The
information used for this control is the voltage that is
developed across the r DS(ON) of each lower MOSFET, while
they are conducting. A single resistor converts and scales
the voltage across the MOSFETs to a current that is applied
to the Current Sensing circuit within the ISL8101. Output
from these sensing circuits is applied to the current
averaging circuit. Each PWM channel receives the
difference current signal from the summing circuit that
compares the average sensed current to the individual
channel current. When a power channel’s current is greater
than the average current, the signal applied via the summing
Correction circuit to the Comparator, reduces the output
pulse width of the Comparator to compensate for the
detected “above average” current in that channel.
MULTIPHASE POWER CONVERSION
Multiphase power conversion provides a cost-effective
power solution when load currents are no longer easily
supported by single-phase converters. Although its greater
complexity presents additional technical challenges, the
multiphase approach offers cost-saving advantages with
improved response time, superior ripple cancellation, and
thermal distribution.
DAC
AND
OSCILLATOR
V IN
REFERENCE
UGATE1
COMP
Σ
PWM
CIRCUIT
HALF-BRIDGE
DRIVE
LGATE1
R 2
PWM
HALF-BRIDGE
L 1
C 2
Σ
CIRCUIT
DRIVE
PHASE1
V OUT
ERROR
FB
AMP
Σ
CURRENT
SENSE
V IN
L 2
C OUT
R 1
AVERAGE
UGATE2
Σ
CURRENT
SENSE
LGATE2
PHASE2
ISL8101
ISEN
R ISEN
V CC
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE ISL8101 VOLTAGE AND CURRENT FEEDBACK
7
FN9223.1
July 28, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ISL8102CRZ | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL8102CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL8102EVAL1 | 功能描述:EVAL BOARD 1 FOR ISL8102 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ISL8102IRZ | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
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