参数资料
| 型号： | ISL8102IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 9/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32-QFN |
| 标准包装： | 6,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 66.6% |
| 电源电压： | 4.75 V ~ 12.6 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： | 32-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页当前第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页第21页第22页第23页第24页第25页第26页第27页
ISL8102
external series gate resistors as this might lead to
shoot-through.
PGOOD (Pin 28)
PGOOD is used as an indication of the end of soft-start. It is
an open-drain logic output that is low impedance until the
soft-start is completed and V OUT is equal to the VID setting.
Once in normal operation PGOOD indicates whether the
output voltage is within specified overvoltage and
undervoltage limits. If the output voltage exceeds these limits
or a reset event occurs (such as an overcurrent event),
PGOOD becomes high impedance again. The potential at this
pin should not exceed that of the potential at VCC pin by more
than a typical forward diode drop at any time.
OVP (Pin 22)
Overvoltage protection pin. This pin pulls to VCC when an
overvoltage condition is detected. Connect this pin to the
gate of an SCR or MOSFET tied across V IN and ground to
prevent damage to a load device.
I L1 + I L2
I L2
PWM2
I L1
PWM1
FIGURE 1. PWM AND INDUCTOR-CURRENT WAVEFORMS
FOR 2-PHASE CONVERTER
To understand the reduction of ripple current amplitude in the
multi-phase circuit, examine the equation representing an
( V IN – V OUT ) ? V OUT
L ? F SW ? V IN
Operation
Multi-Phase Power Conversion
Modern low voltage DC/DC converter load current profiles
individual channel peak-to-peak inductor current.
I PP = ----------------------------------------------------------
(EQ. 1)
have changed to the point that the advantages of multiphase
power conversion are impossible to ignore. The technical
challenges associated with producing a single-phase
converter that is both cost-effective and thermally viable
have forced a change to the cost-saving approach of
multiphase. The ISL8102 controller helps simplify
implementation by integrating vital functions and requiring
conversion using the ISL8102 controller.
Interleaving
The switching of each channel in an ISL8102-based
converter is timed to be symmetrically out of phase with the
other channel. As a result, the two-phase converter has a
combined ripple frequency twice the frequency of one of its
In Equation 1, V IN and V OUT are the input and output
voltages respectively, L is the single-channel inductor value,
and F SW is the switching frequency.
The output capacitors conduct the ripple component of the
inductor current. In the case of multi-phase converters, the
capacitor current is the sum of the ripple currents from each
of the individual channels. Compare Equation 1 to the
expression for the peak-to-peak current after the summation
of N symmetrically phase-shifted inductor currents in
Equation 2. Peak-to-peak ripple current decreases by an
amount proportional to the number of channels. Output
voltage ripple is a function of capacitance, capacitor
equivalent series resistance (ESR), and inductor ripple
current. Reducing the inductor ripple current allows the
designer to use fewer or less costly output capacitors.
L ? F SW ? V
phases. In addition, the peak-to-peak amplitude of the
combined inductor currents is proportionately reduced
(Equations 1 and 2).
( V IN – N ? V OUT ) ? V OUT
I C , PP = --------------------------------------------------------------------
IN
(EQ. 2)
Increased ripple frequency and lower ripple amplitude
generally translate to lower per-channel inductance and
lower total output capacitance for a given set of performance
specifications. Figure 1 illustrates the additive effect on
output ripple frequency. The two channel currents (I L1 and
I L2 ), combine to form the AC ripple current and the DC load
current. The ripple component has two times the ripple
frequency of each individual channel current.
9
Another benefit of interleaving is to reduce input ripple
current. Input capacitance is determined in part by the
maximum input ripple current. Multi-phase topologies can
improve overall system cost and size by lowering input ripple
current and allowing the designer to reduce the cost of input
capacitance. The example in Figure 2 illustrates input
currents from a two-phase converter combining to reduce
the total input ripple current.
FN9247.1
July 28, 2008
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相关代理商/技术参数 |
参数描述 |
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| ISL8103 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Three-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers |
| ISL8103CRZ | 功能描述:IC REG CTRLR BUCK PWM VM 40-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) |
| ISL8103CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 40-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) |
| ISL8103EVAL1 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Three-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers |
| ISL8103IRZ | 功能描述:IC REG CTRLR BUCK PWM VM 40-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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