参数资料
| 型号： | ISL6323AIRZ-T |
| 厂商： | Intersil |
| 文件页数： | 29/36页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTRLR SYNC BUCK DL 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： | -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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ISL6323A
5. Choose a capacitor value for the North Bridge RC filter. A
0.1μF capacitor is a recommended starting point.
6. Calculate the values for R 1 and R 2 for North Bridge.
Equations 41 and 42 will allow for their computation.
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
needs to be increased or the inductor must be changed to an
R 2
K = -------------------------------------
R 1 + R 2
R 1 ? R 2
--------------------- = ------------------------------------- ? C NB
DCR NB R 1 + R 2
L NB NB NB
NB NB
NB
NB NB
(EQ. 41)
(EQ. 42)
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
important that the R SET resistor be tied between the RSET
pin and the VCC pin of the ISL6323A.
CASE 3
I Core
? DCR NB = -------------------------- ? DCR Core
I NB
MAX
MAX
N
(EQ. 43)
Inductor DCR Current Sensing Component Fine
Tuning
In Case 3, the DC voltage across the North Bridge inductor
at full load is equal to the DC voltage across a single phase
of the Core regulator while at full load. Here, the full scale
MOSFET
UGATE(n)
V IN
L
I
L
n
DCR
V OUT
DC inductor voltages for both North Bridge and Core will be
impressed across the ISEN pins without any gain. So, the R 2
DRIVER
LGATE(n)
INDUCTOR
V L (s)
C OUT
resistors for the Core and North Bridge inductor RC filters
are left unpopulated and K = 1 for both regulators.
V C (s)
For this Case, it is recommended that the overcurrent trip
point for the North Bridge regulator be equal to the
overcurrent trip point for the Core regulator divided by the
number of core phases.
1. Choose a capacitor value for the North Bridge RC filter. A
ISL6323A INTERNAL CIRCUIT
I n
R 1
C
R 2
K I = -----------------
0.1μF capacitor is a recommended starting point.
2. Calculate the value for the North Bridge resistor R 1 :
K I
40k Ω
R SET
L NB
DCR NB ? C NB
R 1
NB
= --------------------------------------
(EQ. 44)
SAMPLE
3. Choose a capacitor value for the Core RC filter. A 0.1μF
capacitor is a recommended starting point.
+
-
V C (s)
ISENn-
L Core
R 1
DCR Core ? C Core
5. Calculate the value for the Core resistor R 1 :
= ------------------------------------------------
Core
(EQ. 45)
I SEN
R ISEN
2.4k Ω
ISENn+
RSET
VCC
6. Calculate the value for the R SET resistor using Equation 46:
R SET
400 DCR CORE ? K ?
R SET = ---------- ? ? ? I OCP
100 μ A ? N
?
V IN – V CORE V CORE ?
2 ? L CORE ? f SW
3
Where: K = 1
---------------------------------------
CORE
+ ------------------------------------------- ? -------------------- ?
V IN ?
(EQ. 46)
FIGURE 20. DCR SENSING CONFIGURATION
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
7. Calculate the OCP trip point for the North Bridge regulator
using Equation 47. 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 utilized
Case 2.
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 21.
Follow the steps below to ensure the R-C and inductor
L/DCR time constants are matched accurately.
1. If the regulator is not utilizing droop, modify the circuit by
= 100 μ A ? --------------------- ? ? ---------- ? R SET ? + ---------------------------------- ? -----------
DCR NB ? 400
2 ? L NB ? f SW V IN
I OCP
NB
?
1 3 V IN – V NB V NB
placing the frequency set resistor between FS and
Ground for the duration of this procedure.
(EQ. 47)
29
FN6878.1
May 12, 2010
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