参数资料
| 型号： | ISL6323BCRZ |
| 厂商： | Intersil |
| 文件页数： | 28/36页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTRLR SYNC BUCK DL 48QFN |
| 标准包装： | 43 |
| 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： | 管件 |
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ISL6323B
P DR = P DR_UP + P DR_LOW + P BOOT + ( I Q ? VCC )
(EQ. 30)
6. Calculate the values for R 1 and R 2 for Core.
Equations 35 and 36 will allow for their computation.
P BOOT = ---------------------
P DR_UP = ? -------------------------------------- + ---------------------------------------- ? ? ---------------------
? R HI1 + R EXT1 R LO1 + R EXT1 ?
P DR_LOW = ? ? ? ---------------------
? R HI2 + R EXT2 R LO2 + R EXT2 ?
R 2
K = ----------------------------------------------
R 1 + R 2
R 1 ? R 2
-------------------------- = ---------------------------------------------- ? C Core
DCR Core R 1 + R 2
P Qg_Q1
3
? R HI1 R LO1 ? P Qg_Q1
? R HI2 R LO2 ? P Qg_Q2
-------------------------------------- + ----------------------------------------
3
2
Core Core
L Core Core Core
Core
Core Core
(EQ. 35)
(EQ. 36)
R EXT1 = R G1 + ------------- R EXT2 = R G2 + -------------
I NB
I Core
? DCR NB > -------------------------- ? DCR Core
R GI1 R GI2
N Q1 N Q2
There are 3 separate cases to consider when calculating these
CASE 2
MAX
MAX
N
(EQ. 37)
component values. If the system under design will never utilize
the North Bridge regulator and the ISL6323 will always be in
parallel mode, then follow the instructions for Case 3 and only
calculate values for Core regulator components.
For all three cases, use the expected VID voltage that would
be used at TDC for Core and North Bridge for the V CORE
and V NB variables, respectively.
CASE 1
In Case 2, the DC voltage across the North Bridge inductor
at full load is greater than the DC voltage across a single
phase of the Core regulator while at full load. Here, the DC
voltage across the North Bridge inductor must be scaled
down to match the DC voltage across the Core inductors,
which will be impressed across the ISEN pins without any
gain. So, the R 2 resistor for the Core inductor RC filters is
left unpopulated and K = 1.
I Core
? DCR NB < -------------------------- ? DCR Core
I NB
MAX
MAX
N
(EQ. 31)
1. Choose a capacitor value for the Core RC filter. A 0.1μF
capacitor is a recommended starting point.
2. Calculate the value for resistor R 1 :
L Core
DCR Core ? C Core
In Case 1, the DC voltage across the North Bridge inductor
at full load is less than the DC voltage across a single phase
of the Core regulator while at full load. Here, the DC voltage
R 1
Core
= ------------------------------------------------
(EQ. 38)
across the Core inductors must be scaled down to match the
DC voltage across the North Bridge inductor, which will be
3. Calculate the value for the R SET resistor using Equation 39
(Derived from Equation 20).
R SET = ---------- ? --------------------------------------- ? ? I OCP
?
V IN – V CORE V CORE ?
2 ? L CORE ? f SW
impressed across the ISEN_NB pins without any gain. So,
the R 2 resistor for the North Bridge inductor RC filter is left
unpopulated and K = 1.
1. Choose a capacitor value for the North Bridge RC filter. A
400 DCR CORE ? K ?
3 100 μ A ? N
Where: K = 1
CORE
+ ------------------------------------------- ? -------------------- ?
V IN ?
(EQ. 39)
0.1μF capacitor is a recommended starting point.
2. Calculate the value for resistor R 1 using Equation 32:
4. Using Equation 40 (also derived from Equation 20),
calculate the value of K for the North bridge regulator.
L NB
DCR NB ? C NB
K = ---------- ? R SET ? --------------------- ? -------------------------------------------------------------------------------
DCR NB V IN – V NB V NB
I OCP
2 ? L NB ? f SW V IN
R 1
NB
= --------------------------------------
(EQ. 32)
400
NB
3 1 100 μ A
+ ---------------------------------- ? -----------
3. Calculate the value for the R SET resistor using
Equation 33: (Derived from Equation 20).
(EQ. 40)
400 DCR NB ? K ?
R SET = ---------- ? ------------------------------ ? ? I OCP
?
V IN – V NB V NB ?
2 ? L NB ? f SW V IN ?
3
Where: K = 1
NB
+ ---------------------------------- ? ----------- ?
(EQ. 33)
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.
K = ---------- ? R SET ? ------------------------------ ? -----------------------------------------------------------------------------------------------------------
DCR CORE V IN – N ? V CORE V CORE
I OCP
2 ? L CORE ? f SW
R 2
K = -------------------------------------
R 1 + R 2
R 1 ? R 2
--------------------- = ------------------------------------- ? C NB
DCR NB R 1 + R 2
4. Using Equation 34 (also derived from Equation 20),
calculate the value of K for the Core regulator.
3 N 100 μ A
400
+ --------------------------------------------- ? --------------------
CORE V IN
(EQ. 34)
5. Choose a capacitor value for the Core RC filters. A 0.1μF
capacitor is a recommended starting point.
28
L NB NB NB
NB NB
NB
NB NB
(EQ. 41)
(EQ. 42)
FN6879.1
May 12, 2010
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| ISL6323BCRZR5381 | 制造商:Intersil Corporation 功能描述:4+1 PHASE CONT. FOR CORE+NORTHBRIDGE, 2 PHASE PSI, 3.4MHZ SV - Rail/Tube 制造商:Intersil Corporation 功能描述:IC PWM CTRLR SYNC BUCK DL 48QFN 制造商:Intersil 功能描述:4+1 PHS CONT CORE + NORTHBRDG PROG |
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| ISL6323BCRZ-TR5381 | 制造商:Intersil Corporation 功能描述:4+1 PHASE CONT. FOR CORE+NORTHBRIDGE, 2 PHASE PSI, 3.4MHZ S - Tape and Reel 制造商:Intersil Corporation 功能描述:IC PWM CTRLR SYNC BUCK DL 48QFN 制造商:Intersil 功能描述:4+1 PHS CONT CORE + NORTHBRDG PROG |
| ISL6323BCRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6323BCRZ-T WITH GOLD BOND WIRE ONLY, T&R - Tape and Reel |
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