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| 型号： | FAN3226CMX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 21/26页 |
| 文件大小： | 0K |
| 描述： | IC GATE DVR DUAL 2A 8-SOIC |
| 产品变化通告： | Mold Compound Change 12/Dec/2007 |
| 标准包装： | 1 |
| 配置： | 低端 |
| 输入类型： | 反相 |
| 延迟时间： | 15ns |
| 电流 - 峰： | 3A |
| 配置数： | 2 |
| 输出数： | 2 |
| 电源电压： | 4.5 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 标准包装 |
| 其它名称： | FAN3226CMXDKR |
Thermal Guidelines
Gate drivers used to switch MOSFETs and IGBTs at
high frequencies can dissipate significant amounts of
power. It is important to determine the driver power
dissipation and the resulting junction temperature in the
application to ensure that the part is operating within
acceptable temperature limits.
The total power dissipation in a gate driver is the sum of
two components, P GATE and P DYNAMIC :
P TOTAL = P GATE + P DYNAMIC (1)
Gate Driving Loss: The most significant power loss
results from supplying gate current (charge per unit
time) to switch the load MOSFET on and off at the
switching frequency. The power dissipation that
results from driving a MOSFET at a specified gate-
source voltage, V GS , with gate charge, Q G , at
switching frequency, f SW , is determined by:
P GATE = Q G ? V GS ? f SW ? n (2)
n is the number of driver channels in use (1 or 2).
Dynamic Pre-drive / Shoot-through Current: A
In the forward converter with synchronous rectifier
shown in the typical application diagrams, the
FDMS8660S is a reasonable MOSFET selection. The
gate charge for each SR MOSFET would be 60 nC with
V GS = V DD = 7V. At a switching frequency of 500 kHz,
the total power dissipation is:
P GATE = 60 nC ? 7 V ? 500 kHz ? 2 = 0.42 W (5)
P DYNAMIC = 3 mA ? 7 V ? 2 = 0.042 W (6)
P TOTAL = 0.46 W (7)
The SOIC-8 has a junction-to-board thermal
characterization parameter of ψ JB = 43°C/W. In a
system application, the localized temperature around
the device is a function of the layout and construction of
the PCB along with airflow across the surfaces. To
ensure reliable operation, the maximum junction
temperature of the device must be prevented from
exceeding the maximum rating of 150°C; with 80%
derating, T J would be limited to 120°C. Rearranging
Equation 4 determines the board temperature required
to maintain the junction temperature below 120°C:
power loss resulting from internal current
consumption under dynamic operating conditions,
T B = T J - P TOTAL ? ψ JB
(8)
including pin pull-up / pull-down resistors, can be
obtained using the “I DD (No-Load) vs. Frequency”
graphs in Typical Performance Characteristics to
determine the current I DYNAMIC drawn from V DD
under actual operating conditions:
P DYNAMIC = I DYNAMIC ? V DD ? n (3)
Once the power dissipated in the driver is determined,
the driver junction rise with respect to circuit board can
be evaluated using the following thermal equation,
assuming ψ JB was determined for a similar thermal
design (heat sinking and air flow):
T B = 120°C – 0.46 W ? 43°C/W = 100°C (9)
For comparison, replace the SOIC-8 used in the
previous example with the 3x3 mm MLP package with
ψ JB = 3.5°C/W. The 3x3 mm MLP package could
operate at a PCB temperature of 118°C, while
maintaining the junction temperature below 120°C. This
illustrates that the physically smaller MLP package with
thermal pad offers a more conductive path to remove
the heat from the driver. Consider tradeoffs between
reducing overall circuit size with junction temperature
reduction for increased reliability.
T J
= P TOTAL ? ψ JB + T B
(4)
where:
T J
ψ JB
T B
= driver junction temperature
= (psi) thermal characterization parameter
relating temperature rise to total power
dissipation
= board temperature in location defined in Note
2 under Thermal Resistance table.
? 2007 Fairchild Semiconductor Corporation
FAN3226 / FAN3227 / FAN3228 / FAN3229 ? Rev. 1.1.0
21
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN3226CMX_12 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual 2A High-Speed, Low-Side Gate Drivers |
| FAN3226CMX_F085 | 功能描述:功率驱动器IC Dual 2A High-Speed Low-Side Gate Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FAN3226T | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual 2A High-Speed, Low-Side Gate Drivers |
| FAN3226TMPX | 功能描述:功率驱动器IC Dual 2A High-Speed Low-Side Gate RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FAN3226TMX | 功能描述:功率驱动器IC DUAL 2A HIGH-SPEED LOW-SIDE GATE RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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