参数资料
| 型号： | ISL8102IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 20/27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页当前第20页第21页第22页第23页第24页第25页第26页第27页
ISL8102
L
V L (s)
DCR
I OUT
PHASE1
R S
I
INDUCTOR
L 1
V OUT
C OUT
Δ V 1
Δ V 2
L
DCR
V OUT
PHASE2
ISUM
R S
I
INDUCTOR
L 2
Δ I
I TRAN
ICOMP
C COMP
R COMP
FIGURE 19. TIME CONSTANT MISMATCH BEHAVIOR
-
DROOP
V DROOP
Compensation
The two opposing goals of compensating the voltage
ISL8102
IREF
+
regulator are stability and speed. Depending on whether the
regulator employs the optional load-line regulation (as
methods for achieving these goals.
FIGURE 18. DCR SENSING CONFIGURATION
Due to errors in the inductance or DCR it may be necessary
to adjust the value of R COMP to match the time constants
correctly. The effects of time constant mismatch can be seen
in the form of droop overshoot or undershoot during the
initial load transient spike, as shown in Figure 19. Follow the
steps below to ensure the R-C and inductor L/DCR time
constants are matched accurately.
1. Capture a transient event with the oscilloscope set to
about L/DCR/2 (sec/div). For example, with L = 1μH and
DCR = 1m Ω , set the oscilloscope to 500μs/div.
Compensating the Load-Line Regulated Converter
The load-line regulated converter behaves in a similar
manner to a peak current mode controller because the two
poles at the output filter L-C resonant frequency split with the
introduction of current information into the control loop. The
final location of these poles is determined by the system
function, the gain of the current signal, and the value of the
compensation components, R 2 and C 1
.
C 2 (OPTIONAL)
2. Record Δ V 1 and Δ V 2 as shown in Figure 19.
3. Select a new value, R COMP,2 , for the time constant
R 2
C 1
COMP
resistor based on the original value, R COMP,1 , using
Equation 27.
FB
R COMP , 2 = R COMP , 1 ? ----------
Δ V 1
Δ V 2
(EQ. 27)
R 1
ISL8102
4. Replace R COMP with the new value and check to see that
the error is corrected. Repeat the procedure if necessary.
After choosing a new value for R COMP , it will most likely be
necessary to adjust the value of R S to obtain the desired full
load droop voltage. Use Equation 26 to obtain the new value
for R S .
20
VDIFF
FIGURE 20. COMPENSATION CONFIGURATION FOR
LOAD-LINE REGULATED ISL8102 CIRCUIT
Since the system poles and zero are affected by the values
of the components that are meant to compensate them, the
solution to the system equation becomes fairly complicated.
Fortunately, there is a simple approximation that comes very
close to an optimal solution. Treating the system as though it
were a voltage-mode regulator, by compensating the L-C
FN9247.1
July 28, 2008
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| ISL8104IRZ | IC REG CTRLR BUCK PWM VM 16-QFN |
| ISL8105BIBZ | IC REG CTRLR BUCK PWM VM 8-SOIC |
| ISL8105IBZ | IC REG CTRLR BUCK PWM VM 8-SOIC |
| ISL8106IRZ | IC REG CTRLR BUCK PWM VM 16-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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