参数资料
型号: BD6718FV-E2
元件分类: 运动控制电子
英文描述: BRUSHLESS DC MOTOR CONTROLLER, 0.02 A, PDSO20
封装: ROHS COMPLIANT, SSOP-20
文件页数: 25/34页
文件大小: 1916K
代理商: BD6718FV-E2
31/40
9) The upside output of pre-driver<BD6718FV、BD6722FS>
High side output of pre-driver (half pre-driver) are constant current open-drain output. Decide the resistance of R1 so
that the voltage generated between G-S of external Pch transistor may exceed enough the threshold voltage of the
transistor.
Ex. At R1=100Ω, VGSP : between G-S of the Pch transistor.
VGSP = R1 × IH
= 100Ω × 10mA (typ.)
= 1V
R2 is used to suppress the power consumption of IC.
At VM = 12V, The power consumption of upside output transistor M1 is
PM1 = { VM - (R1 + R2) × IH } × IH
At R1 = 100Ω, R2 = 0Ω
PM1=110mW
At R1 = 100Ω, R2 = 1kΩ
PM1=10mW
Especially BD6722FS, useless power consumption in the upside output is suppressed by appropriately setting R2,
and a permissible loss of the package can be used effectively in lower output.
10
7
9
VM line
IH
R1
R2
6
M1
Fig.96 Voltage setting between G-S of external Pch transistor
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