参数资料
| 型号： | ISL8130IAZ |
| 厂商： | Intersil |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK VM 20QSOP |
| 标准包装： | 58 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.4MHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 是 |
| 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： | 20-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
ISL8130
minimize the output capacitance required. Also, if the load
transient rise time is slower than the inductor response time, as
Boost Converter Layout Considerations
in a hard drive or CD drive, it reduces the requirement on the
output capacitor.
The maximum capacitor value required to provide the full, rising
step, transient load current during the response time of the
ISL8130
VIN
R CS
C IN
( L O ) ( I TRAN )
2 ( V IN – V O ) ( DV OUT )
inductor is shown in Equation 13:
2
C OUT = -----------------------------------------------------------
(EQ. 13)
L BST
V OUT
where C OUT is the output capacitor(s) required, L O is the output
inductor, I TRAN is the transient load current step, V IN is the input
voltage, V O is output voltage, and DV OUT is the drop in output
voltage allowed during the load transient.
UGATE
PHASE
Q1
D2
C O
High frequency capacitors initially supply the transient current
and slow the load rate-of-change seen by the bulk capacitors. The
bulk filter capacitor values are generally determined by the ESR
(Equivalent Series Resistance) and voltage rating requirements
as well as actual capacitance requirements.
The output voltage ripple is due to the inductor ripple current and
the ESR of the output capacitors as defined by Equation 14:
RETURN
FIGURE 34. PRINTED CIRCUIT BOARD POWER AND GROUND
PLANES OR ISLANDS
Figure 34 shows the critical power components of the boost
converter. To minimize the voltage overshoot the interconnecting
wires indicated by heavy lines should be part of ground or power
V RIPPLE = Δ I L ( ESR )
(EQ. 14)
plane in a printed circuit board. The components shown in
Figure 34 should be located as close together as possible.
( I OUT ) ( V OUT ) ( t SWON + t SWOFF ) ( F SW )
2 ? V IN
High frequency decoupling capacitors should be placed as close
to the power pins of the load as physically possible. Be careful
not to add inductance in the circuit board wiring that could
cancel the usefulness of these low inductance components.
Consult with the manufacturer of the load circuitry for specific
decoupling requirements.
Use only specialized low-ESR capacitors intended for
switching-regulator applications for the bulk capacitors. In most
Boost Converter Component Selection
MOSFET CONSIDERATIONS
The boost converter MOSFET has both conduction loss and
switching losses (Equation 16).
2
P FET = P COND + ------------------------------------------------------------------------------------------------------------------
(EQ. 16)
The conduction Loss P COND is given by Equation 17:
P COND = ( I RMSFET ) ? r DS ( ON )
cases, multiple small-case electrolytic capacitors perform better
than a single large-case capacitor.
2
(EQ. 17)
INPUT CAPACITOR SELECTION
Where I RMSFET is the MOSFET RMS drain current (Equation 18).
I OUT ? V OUT
Δ i PP ?
?
I RMSFET = ----------------------------------- ? DC ? ? 1 + ---------------- ?
V IN ? ?
( I OUT ) ( V OUT ) ( t SWON + t SWOFF ) ( F SW )
2 ? V IN
The important parameters for the bulk input capacitor(s) are the
voltage rating and the RMS current rating. For reliable operation,
select bulk input capacitors with voltage and current ratings
above the maximum input voltage and largest RMS current
required by the circuit. The capacitor voltage rating should be at
least 1.25x greater than the maximum input voltage and 1.5x is
a conservative guideline. The AC RMS Input current varies with
the load. The total RMS current supplied by the input capacitance
is given by Equation 15:
2
12
DC is duty cycle of the boost converter.
The switching loss is shown by Equation 19:
2
P SW = ------------------------------------------------------------------------------------------------------------------
(EQ. 18)
(EQ. 19)
DC – DC ? I O
I RMSx =
2
(EQ. 15)
t SWON and t SWOFF are the MOSFET turn on and turn off time
respectively and Vm is the plateau voltage during the MOSFET
( PVCC – V m )
t SWOFF = --------------------------------------------------------
where, DC is duty cycle of the buck converter.
Use a mix of input bypass capacitors to control the voltage ripple
across the MOSFETs. Use ceramic capacitors for the high
frequency decoupling and bulk capacitors to supply the RMS
current. Small ceramic capacitors can be placed very close to the
upper MOSFET to suppress the voltage induced in the parasitic
circuit impedances.
19
turn on and turn off (Equations 20, 21):
Q gd ? ( 2 Ω + R GFET )
t SWON = --------------------------------------------------------
Q gd ? ( 2 Ω + R GFET )
V m
(EQ. 20)
(EQ. 21)
FN7954.3
October 5, 2012
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相关代理商/技术参数 |
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| ISL8130IAZ-T7A | 功能描述:电流型 PWM 控制器 PB-FREE SYNC BUCK PWM CONT. W/ 4.5V-28V INPUT,20LD QSOP, 250 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL8130IAZ-TK | 功能描述:IC REG CTRLR BST FLYBK VM 20QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL8130IRZ | 功能描述:IC REG CTRLR BST FLYBK PWM 20QFN 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:75 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.3 V ~ 13.5 V 降压:是 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:0°C ~ 70°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:管件 产品目录页面:1051 (CN2011-ZH PDF) 其它名称:296-2543-5 |
| ISL8130IRZ-T7A | 功能描述:电流型 PWM 控制器 Pb-Free W/Anneal SYNC BUCK PWM CONT. WITH 4.5V-28V INPUT,20 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL8130IRZ-TK | 功能描述:IC REG CTRLR BST FLYBK PWM 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
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