参数资料
| 型号： | ISL6324IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 31/38页 |
| 文件大小： | 0K |
| 描述： | IC HYBRID CTRLR PWM DUAL 48-QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，AMD SVI |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 2 |
| 输出电压： | 最高 2V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（7x7） |
| 包装： | 带卷 (TR) |
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ISL6324
Inductor DCR Current Sensing Component Fine
Tuning
4. Replace R 1 and R 2 with the new values and check to see
that the error is corrected. Repeat the procedure if
V IN
I
L
n
necessary.
UGATE(n)
MOSFET
L
DCR
V OUT
DRIVER
LGATE(n)
INDUCTOR
V L (s)
C OUT
Δ V 1
Δ V 2
V C (s)
V OUT
ISL6323 INTERNAL CIRCUIT
I n
SAMPLE
R 1
C
R 2
Δ I
I TRAN
I SEN
+
-
V C (s)
R ISEN
ISENn-
ISENn+
VCC
FIGURE 22. TIME CONSTANT MISMATCH BEHAVIOR
Loadline Regulation Resistor
The loadline regulation resistor, labeled R FB in Figure 8,
sets the desired loadline required for the application.
{
Core Channels
R SET
V DROOP
R FB = ----------------------------------------------------------------------
I OUT
---------- ? -------------------------- ? --------------- ? K
R SET
To Active
RSET
To North Bridge
C SET
FIGURE 21. DCR SENSING CONFIGURATION
Equation 48 can be used to calculate R FB .
MAX
400 MAX DCR
3 N
(EQ. 48)
Due to errors in the inductance and/or DCR it may be
necessary to adjust the value of R 1 and R 2 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 22.
Follow the steps below to ensure the RC and inductor
L/DCR time constants are matched accurately.
1. If the regulator is not utilizing droop, modify the circuit by
placing the frequency set resistor between FS and
Ground for the duration of this procedure.
2. 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.
3. Record Δ V1 and Δ V2 as shown in Figure 22. Select new
values, R 1(NEW) and R 2(NEW ) for the time constant
resistors based on the original values, R 1(OLD) and
R 2(OLD) using Equations 46 and 47.
Where K is defined in Equation 7.
If no loadline regulation is required, FS resistor should be
tied between the FS pin and VCC. To choose the value for
R FB in this situation, please refer to “Compensation Without
Compensation With Loadline Regulation
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 C and C C .
Δ V 1
Δ V 2
R 2 ( NEW ) = R 2 ( OLD ) ? ----------
R 1 ( NEW ) = R 1 ( OLD ) ? ----------
Δ V 1
Δ V 2
31
(EQ. 46)
(EQ. 47)
FN6518.2
September 25, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6326AIRZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6326BCRZ | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM 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 |
| ISL6326BCRZ-T | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM 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 |
| ISL6326BIRZ | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR IND 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 |
| ISL6326BIRZ-T | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR IND 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 |
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