参数资料
| 型号： | ISL6324ACRZ-T |
| 厂商： | Intersil |
| 文件页数： | 33/40页 |
| 文件大小： | 0K |
| 描述： | IC HYBRID CTRLR PWM DUAL 48QFN |
| 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： | 0°C ~ 70°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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ISL6324A
5. Calculate the value for the R SET resistor using Equation 44:
Due to errors in the inductance and/or DCR it may be
400 DCR CORE ? K ?
R SET = ---------- ? --------------------------------------- ? ? I OCP
?
V IN – V CORE V CORE ?
2 ? L CORE ? f S
3
Where: K = 1
CORE
+ ------------------------------------- ? -------------------- ?
V IN ?
(EQ. 44)
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.
6. Calculate the OCP trip point for the North Bridge
regulator using Equation 45. If the OCP trip point is higher
than desired, then the component values must be
recalculated utilizing Case 1. If the OCP trip point is lower
than desired, then the component values must be
recalculated utilizing Case 2.
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.
= 100 μ A ? --------------------- ? ? ---------- ? R SET ? + ----------------------------- ? -----------
2 ? L NB ? f S V IN
? 400 ?
I OCP
NB
DCR NB
1 3 V IN – V NB V NB
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.
(EQ. 45)
NOTE: The values of R SET must be greater than 20k Ω and
less than 80k Ω . For all of the 3 cases, if the calculated value
of R SET is less than 20k Ω , then either the OCP trip point
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.
Δ V 1
Δ V 2
R 2 ( 1 ) ( NEW ) = R 2 ( OLD ) ? ----------
needs to be increased or the inductor must be changed to an
inductor with higher DCR. If the R SET resistor is greater than
80k Ω , then a value of R SET that is less than 80k Ω must be
chosen and a resistor divider across both North Bridge and
Core inductors must be set up with proper gain. This gain
will represent the variable “K” in all equations. It is also very
R 1 ( NEW ) = R 1 ( OLD ) ? ----------
Δ V 1
Δ V 2
(EQ. 46)
(EQ. 47)
important that the R SET resistor be tied between the RSET
pin and the VCC pin of the ISL6323.
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
necessary.
V IN
I
L n
MOSFET
UGATE(n)
L
DCR
V OUT
Δ V 1
Δ V 2
DRIVER
LGATE(n)
INDUCTOR
V L (s)
C OUT
V OUT
V C (s)
ISL6323 INTERNAL CIRCUIT
R 1
C
R 2
Δ I
I TRAN
I n
FIGURE 22. TIME CONSTANT MISMATCH BEHAVIOR
SAMPLE
Loadline Regulation Resistor
V DROOP
R FB = ----------------------------------------------------------------------
(EQ. 48)
I OUT
---------- ? -------------------------- ? --------------- ? K
R SET
I SEN
+
-
V C (s)
R ISEN
ISENn-
ISENn+
VCC
RSET
R SET
The loadline regulation resistor, labeled R FB in Figure 8,
sets the desired loadline required for the application.
Equation 48 can be used to calculate R FB .
MAX
400 MAX DCR
3 N
Where K is defined in Equation 7.
C SET
FIGURE 21. DCR SENSING CONFIGURATION
33
If no loadline regulation is required, FS resistor should be
tied between the FS pin and VCC. To choose the value for
FN6880.2
May 14, 2010
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相关代理商/技术参数 |
参数描述 |
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| ISL6324ACRZ-TR5381 | 制造商:Intersil Corporation 功能描述:4+1 PHASE CONT., CORE + NORTHBRIDGE, PROG PSI, 3.4MHZ SVI, 5 - Tape and Reel 制造商:Intersil Corporation 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN |
| ISL6324AIRZ | 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 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:管件 |
| ISL6324AIRZR5381 | 制造商:Intersil Corporation 功能描述:4+1 PHASE CONTROLLER, CORE + NORTHBRIDGE, PROG PSI, 3.4MHZ S - Rail/Tube 制造商:Intersil Corporation 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN |
| ISL6324AIRZ-T | 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 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:管件 |
| ISL6324AIRZ-TR5381 | 制造商:Intersil Corporation 功能描述:4+1 PHASE CONTROLLER, CORE + NORTHBRIDGE, PROG PSI, 3.4MHZ S - Tape and Reel 制造商:Intersil Corporation 功能描述:IC HYBRID CTRLR PWM DUAL 48QFN |
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