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参数资料
| 型号： | IR3086M |
| 厂商： | International Rectifier |
| 文件页数： | 14/34页 |
| 文件大小： | 0K |
| 描述： | IC PHASE CONTROLLER 20-MLPQ |
| 标准包装： | 5 |
| 系列： | XPhase™ |
| 应用： | 处理器 |
| 电流 - 电源： | 10mA |
| 电源电压： | 8.4 V ~ 14 V |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-MLPQ |
| 供应商设备封装： | 20-MLPQ（4x4） |
| 包装： | 剪切带 (CT) |
| 其它名称： | *IR3086M |
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IR3086
DESIGN PROCEDURES - IR3081 AND IR3086 CHIPSET
IR3081 EXTERNAL COMPONENTS
Oscillator Resistor Rosc
The oscillator of IR3081 generates a triangle waveform to synchronize the phase ICs, and the switching frequency
of the each phase converter equals the oscillator frequency, which is set by the external resistor R OSC according to
the curve in Figure 13 of IR3081 Data Sheet.
Soft Start Capacitor C SS/DEL and Resistor R SS/DEL
Because the capacitor C SS/DEL programs four different time parameters, i.e. soft start delay time, soft start time,
over-current latch delay time, and power good delay time, they should be considered together while choosing
C SS/DEL .
The SS/DEL pin voltage controls the slew rate of the converter output voltage, as shown in Figure 10 of IR3081
Data Sheet. After the ENABLE pin voltage rises above 0.6V, there is a soft-start delay time t SSDEL, after which the
error amplifier output is released to allow the soft start. The soft start time t SS represents the time during which
converter voltage rises from zero to V O. t SS can be programmed by an external capacitor, which is determined by
Equation (1).
C SS / DEL = CHG
I * t SS
V O
=
70 * 10 ? 6 * t SS
V O
(1)
Once C SS/DEL is chosen, the soft start delay time t SSDEL, the over-current fault latch delay time t OCDEL , and the
delay time t VccPG from output voltage (V O ) in regulation to Power Good are fixed and shown in Equations (2), (3)
and (4) respectively.
t SSDEL =
C SS / DEL * 1 . 3
I CHG
=
C SS / DEL * 1 . 3
70 * 10 ? 6
(2)
t OCDEL =
C SS / DEL * 0 . 09
I DISCHG
=
C SS / DEL * 0 . 09
6 * 10 ? 6
(3)
t VccPG =
C SS / DEL * ( 3 . 91 ? V O ? 1 . 3 )
I CHG
=
C SS / DEL * ( 3 . 91 ? V O ? 1 . 3 )
70 * 10 ? 6
(4)
If faster over-current protection is required, a resistor in series with the soft start capacitor C SS/DEL can be used to
reduce the over-current fault latch delay time t OCDEL , and the resistor R SS/DEL is determined by Equation (5).
Equation (1) for soft start capacitor C SS/DEL and Equation (4) for power good delay time t VccPG are unchanged,
while the equation for soft start delay time t SS/DEL (Equation 2) is changed to Equation (6). Considering the worst
case values of charge and discharge current, R SS/DEL should be no grater than 10k ? .
t ? 6 * 10 ? 6
R SS / DEL =
0 . 09 ?
t OCDEL * I DISCHG
C SS / DEL
I DISCHG
=
0 . 09 ? OCDEL
C SS / DEL
6 * 10 ? 6
(5)
t SSDEL =
C SS / DEL * ( 1 . 3 ? R SS / DEL ? I CHG )
I CHG
=
C SS / DEL * ( 1 . 3 ? R SS / DEL * 70 * 10 ? 6 )
70 * 10 ? 6
(6)
VDAC Slew Rate Programming Capacitor C VDAC and Resistor R VDAC
The slew rate of VDAC down-slope SR DOWN can be programmed by the external capacitor C VDAC as defined in
Equation (7), where I SINK is the sink current of VDAC pin as shown in Figure 15 of IR3081 Data Sheet. The resistor
R VDAC is used to compensate VDAC circuit and is determined by Equation (8). The slew rate of VDAC up-slope
Page 14 of 34
9/30 /04
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