参数资料
型号: IR3084AMPBF
厂商: International Rectifier
文件页数: 31/45页
文件大小: 0K
描述: IC XPHASE CONTROL 28-MLPQ
标准包装: 100
系列: XPhase™
应用: 处理器
电流 - 电源: 14mA
电源电压: 9.5 V ~ 16 V
工作温度: 0°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 28-MLPQ
供应商设备封装: 28-MLPQ(5x5)
包装: 剪切带 (CT)
IR3084A
Combining the Over Temperature and Phase Delay Setting Resistors R PHASE1 , R PHASE2 and R PHASE3
The over temperature setting resistor divider can be combined with the phase delay resistor divider to save one
resistor per phase.
Calculate the HOTSET threshold voltage V HOTSET corresponding to the allowed maximum temperature from
Equation (20). If the over temperature setting voltage is lower than the phase delay setting voltage,
VBIAS*RA PHASEx , connect RMPIN+ or RMPIN ? pin between R PHASEx1 and R PHASEx2 and connect HOTSET pin
between R PHASEx2 and R PHASEx3 respectively. Pre-select R PHASEx1, then calculate R PHASEx2 and R PHASEx3 ,
R PHASEx2 ?
R PHASEx3 ?
(RA PHASEx ? V BIAS ? V HOTSET )*R PHASEx1
V BIAS ? (1 ? RA PHASEx )
V HOTSET ? R PHASEx1
V BIAS *(1 ? RA PHASEx )
(24)
(25)
If the over temperature setting voltage is higher than the phase delay setting voltage, VBIAS*RA PHASEx , connect
HOTSET pin between R PHASEx1 and R PHASEx2 and connect RMPIN+ or RMPIN ? between R PHASEx2 and
R PHASEx3 respectively. Pre-select R PHASEx1 ,
R PHASEx2 ?
R PHASEx3 ?
(V HOTSET ? RA PHASEx ? V BIAS ) ? R PHASEx1
V BIAS ? V HOTSET
RA PHASEx ? V BIAS *R PHASEx1
V BIAS ? V HOTSET
(26)
(27)
Bootstrap Capacitor C BST
Depending on the duty cycle and gate drive current of the phase IC, a 0.1uF to 1uF capacitor is needed for the
bootstrap circuit.
Decoupling Capacitors for Phase IC
0.1uF ? 1uF decoupling capacitors are required at VCC and VCCL pins of phase ICs.
Page 31 of 45
3/3/2009
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