参数资料
型号: ISL6524ACBZA-T
厂商: Intersil
文件页数: 14/16页
文件大小: 0K
描述: IC CTRLR VRM8.5 PWM TRPL 28-SOIC
标准包装: 1,000
应用: 控制器,Intel VRM8.5
输入电压: 10.8 V ~ 13.2 V
输出数: 4
输出电压: 多重
工作温度: 0°C ~ 70°C
安装类型: *
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
供应商设备封装: *
包装: 带卷 (TR)
+12V
V CC
+5V OR LESS
Linear Controllers Transistor Selection
The ISL6524A linear controllers are compatible with both
NPN bipolar as well as N-channel MOSFET transistors. The
main criteria for selection of pass transistors for the linear
ISL6524A
UGATE
PHASE
Q1
NOTE:
V GS ≈ V CC -5V
regulators is package selection for efficient removal of heat.
The power dissipated in a linear regulator is
P LINEAR = I O × ( V IN – V OUT )
-
+
LGATE
PGND
Q2
CR1
NOTE:
V GS ≈ V CC
Select a package and heatsink that maintains the junction
temperature below the maximum desired temperature with
the maximum expected ambient temperature.
GND
FIGURE 13. UPPER GATE DRIVE - DIRECT V CC DRIVE
14
When selecting bipolar NPN transistors for use with the
linear controllers, insure the current gain at the given
operating V CE is sufficiently large to provide the desired
output load current when the base is fed with the minimum
driver output current.
In order to ensure the strict timing/level requirement of
OUT4, an NPN transistor is recommended for use as a pass
element on this output (Q5). An low gate threshold NMOS
could be used, but meeting the requirements would then
depend on the VCC bias being sufficiently high to allow
control of the MOSFET.
FN9064.1
April 8, 2005
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