参数资料
| 型号： | IR3081M |
| 厂商： | International Rectifier |
| 文件页数： | 18/39页 |
| 文件大小： | 0K |
| 描述： | IC PHASE CONTROLLER 28-MLPQ |
| 标准包装： | 100 |
| 系列： | XPhase™ |
| 应用： | 处理器 |
| 电流 - 电源： | 11mA |
| 电源电压： | 9.5 V ~ 14 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) |
| 其它名称： | *IR3081M |
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IR3081
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.
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. 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 =
I CHG * 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. The resistor R VDAC is used to
compensate VDAC circuit and is determined by Equation (8). The slew rate of VDAC up-slope SR UP is proportional
Page 18 of 39
10/01 /04
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