参数资料
型号: IR3084UMPBF
厂商: International Rectifier
文件页数: 33/47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)
IR3084U
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 33 of 47
June 1, 2009
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