参数资料
| 型号： | ISL6323BCRZ |
| 厂商： | Intersil |
| 文件页数： | 27/36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
1.6
1.4
1.2
1.0
0.8
0.6
Q GATE = 100nC
In Equations 28 and 29, P Qg_Q1 is the total upper gate drive
power loss and P Qg_Q2 is the total lower gate drive power
loss; the gate charge (Q G1 and Q G2 ) is defined at the
particular gate to source drive voltage PVCC in the
corresponding MOSFET data sheet; I Q is the driver total
quiescent current with no load at both drive outputs; N Q1 and
N Q2 are the number of upper and lower MOSFETs per phase,
respectively; N PHASE is the number of active phases. The
I Q* VCC product is the quiescent power of the controller
without capacitive load and is typically 75mW at 300kHz.
0.4
0.2
20nC
50nC
PVCC
BOOT
C GD
D
0.0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
R HI1
UGATE
G
C DS
Δ V BOOT_CAP (V)
FIGURE 17. BOOTSTRAP CAPACITANCE vs BOOT RIPPLE
VOLTAGE
R LO1
R G1
R GI1
C GS
Q1
Package Power Dissipation
When choosing MOSFETs it is important to consider the
amount of power being dissipated in the integrated drivers
located in the controller. Since there are a total of three
drivers in the controller package, the total power dissipated
by all three drivers must be less than the maximum
allowable power dissipation for the QFN package.
S
PHASE
FIGURE 18. TYPICAL UPPER-GATE DRIVE TURN-ON PATH
PVCC
D
C GD
Calculating the power dissipation in the drivers for a desired
application is critical to ensure safe operation. Exceeding the
maximum allowable power dissipation level will push the IC
beyond the maximum recommended operating junction
R HI2
R LO2
LGATE
G
R G2
R GI2
C GS
C DS
Q2
temperature of +125°C. The maximum allowable IC power
dissipation for the 7x7 QFN package is approximately 3.5W
S
FIGURE 19. TYPICAL LOWER-GATE DRIVE TURN-ON PATH
The total gate drive power losses are dissipated among the
When designing the ISL6323B into an application, it is
recommended that the following calculation is used to
ensure safe operation at the desired frequency for the
selected MOSFETs. The total gate drive power losses,
P Qg_TOT , due to the gate charge of MOSFETs and the
integrated driver ’s internal circuitry and their corresponding
average driver current can be estimated with Equations 28
and 29, respectively.
resistive components along the transition path and in the
bootstrap diode. The portion of the total power dissipated in
the controller itself is the power dissipated in the upper drive
path resistance (P DR_UP ), the lower drive path resistance
(P DR_UP ), and in the boot strap diode (P BOOT ). The rest of
the power will be dissipated by the external gate resistors
(R G1 and R G2 ) and the internal gate resistors (R GI1 and
R GI2 ) of the MOSFETs. Figures 18 and 19 show the typical
P Qg_Q1 = --- ? Q G1 ? PVCC ? F SW ? N Q1 ? N PHASE
P Qg_TOT = P Qg_Q1 + P Qg_Q2 + I Q ? VCC
3
2
P Qg_Q2 = Q G2 ? PVCC ? F SW ? N Q2 ? N PHASE
(EQ. 28)
upper and lower gate drives turn-on transition path. The total
power dissipation in the controller itself, P DR , can be roughly
estimated as Equation 30:
Inductor DCR Current Sensing Component
Selection and R SET Value Calculation
I DR = ? --- ? Q G1 ? N
3
? 2
Q1
?
+ Q G2 ? N Q2 ? ? N PHASE ? F SW + I Q
(EQ. 29)
With the single R SET resistor setting the value of the
effective internal sense resistors for both the North Bridge
and Core regulators, it is important to set the R SET value
and the inductor RC filter gain, K, properly. See “Continuous
Current Sampling” on page 14 and “Channel-Current
Balance” on page 15 for more details on the application of
the R SET resistor and the RC filter gain.
27
FN6879.1
May 12, 2010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ISL6323BCRZ-T | 功能描述:IC PWM CTRLR SYNC BUCK DL 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 |
| 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 |
| ISL6323BIRZ | 功能描述:IC PWM CTRLR SYNC BUCK DL 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 |
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