参数资料
| 型号： | ISL6308ACRZ |
| 厂商： | Intersil |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM BUCK 3PHASE 40-QFN |
| 标准包装： | 500 |
| 应用： | 控制器，DDR |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 2.3 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 管件 |
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ISL6308A
At turn on, the upper MOSFET begins to conduct and this
transition occurs over a time t 2 . In Equation 17, the
average driver current can be estimated with Equations 20
and 21, respectively.
P UP , 2 ≈ V IN ? ? ------ – --------- ? ? ? ---- 2 ? ? F SW
P Qg_Q1 = --- ? Q G1 ? PVCC ? F SW ? N Q1 ? N PHASE
approximate power loss is P UP,2 .
? I M I PP ? ? t ?
? N 2 ? ? 2 ?
(EQ. 17)
P Qg_TOT = P Qg_Q1 + P Qg_Q2 + I Q ? VCC
3
2
(EQ. 20)
A third component involves the lower MOSFET
reverse-recovery charge, Q rr . Since the inductor current has
fully commutated to the upper MOSFET before the
P Qg_Q2 = Q G2 ? PVCC ? F SW ? N Q2 ? N PHASE
I DR = ? --- ? Q G1 ? N
lower-MOSFET body diode can recover all of Q rr , it is
conducted through the upper MOSFET across V IN . The
power dissipated as a result is P UP,3 .
3
? 2
Q1
?
+ Q G2 ? N Q2 ? ? N PHASE ? F SW + I Q
(EQ. 21)
P UP , 3 = V IN ? Q rr ? F SW
(EQ. 18)
In Equations 20 and 21, P Qg_Q1 is the total upper gate drive
power loss and P Qg_Q2 is the total lower gate drive power
Finally, the resistive part of the upper MOSFET is given in
Equation 19 as P UP,4 .
loss; the gate charge (Q G1 and Q G2 ) is defined at the
particular gate to source drive voltage PVCC in the
I PP2
? I M ?
P UP , 4 ≈ r DS ( ON ) ? d ? ? ------ ? + ----------
? N ? 12
2
(EQ. 19)
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
The total power dissipated by the upper MOSFET at full load
can now be approximated as the summation of the results
from Equations 16, 17, 18 and 19. Since the power
equations depend on MOSFET parameters, choosing the
phases. The I Q* VCC product is the quiescent power of the
controller without capacitive load and is typically 75mW at
300kHz.
correct MOSFETs can be an iterative process involving
repetitive solutions to the loss equations for different
MOSFETs and different switching frequencies.
PVCC
BOOT
C GD
D
Package Power Dissipation
When choosing MOSFETs it is important to consider the
amount of power being dissipated in the integrated drivers
R HI1
R LO1
UGATE
G
R G1
R GI1
C GS
C DS
Q1
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.
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
temperature of +125°C. The maximum allowable IC power
dissipation for the 6x6 QFN package is approximately 4W at
S
PHASE
FIGURE 15. TYPICAL UPPER-GATE DRIVE TURN-ON PATH
PVCC
D
C GD
for thermal transfer improvement suggestions.
R HI2
LGATE
G
C DS
When designing the ISL6308A into an application, it is
recommended that the following calculation is used to
R LO2
R G2
R GI2
C GS
Q2
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
19
S
FIGURE 16. TYPICAL LOWER-GATE DRIVE TURN-ON PATH
FN6669.0
September 9, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6308ACRZR5609 | 制造商:Intersil Corporation 功能描述:PB-FREE DAC-LESS MULTI-PHASE PWM CONTR W/3-DRIVERS, HARD WI - Rail/Tube |
| ISL6308ACRZ-T | 功能描述:IC CTRLR PWM BUCK 3PHASE 40-QFN 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 |
| ISL6308ACRZ-TR5609 | 制造商:Intersil Corporation 功能描述:PB-FREE DAC-LESS MULTI-PHASE PWM CONTR W/3-DRIVERS, HARD WIR - Tape and Reel |
| ISL6308AEVAL1Z | 功能描述:EVALUATION BOARD FOR ISL6308A RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6308AIRZ | 功能描述:IC CTRLR PWM BUCK 3PHASE 40-QFN 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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