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参数资料
| 型号： | IR3088AM |
| 厂商： | International Rectifier |
| 英文描述： | XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT |
| 中文描述： | XPHASETM相集成电路及超温故障检测 |
| 文件页数： | 14/34页 |
| 文件大小： | 1264K |
| 代理商： | IR3088AM |
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IR3088A
DESIGN PROCEDURES - IR3081 AND IR3088A 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).
t
V
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.
3
*
3
*
CHG
I
09
.
*
09
.
*
DISCHG
I
)
91
.
*
=
=
CHG
I
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
.
*
09
.
=
=
DISCHG
I
)
3
*
=
=
CHG
I
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
O
SS
O
SS
CHG
DEL
SS
V
t
I
C
*
10
*
70
*
6
/
=
=
(1)
6
/
/
10
*
70
=
=
DEL
SS
DEL
SS
SSDEL
C
C
t
(2)
6
/
/
10
*
6
=
=
DEL
SS
DEL
SS
OCDEL
C
C
t
(3)
6
/
/
10
*
70
)
91
.
*
O
DEL
SS
O
DEL
SS
VccPG
t
V
C
V
C
(4)
6
/
6
/
/
10
*
6
10
*
6
09
.
DEL
SS
OCDEL
t
DEL
SS
DISCHG
OCDEL
t
DEL
SS
C
C
I
R
(5)
6
6
/
/
/
/
10
*
70
)
10
*
70
*
3
*
DEL
SS
DEL
SS
CHG
DEL
SS
DEL
SS
SSDEL
R
C
I
R
C
t
(6)
Page 14 of 34
9/30
/04
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| IR3088AMPBF | 功能描述:IC XPHASE CONTROL 20L-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| IR3088AMTR | 功能描述:IC XPHASE W/FAULT DET 20L-MLPQ RoHS:否 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
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| IR3088APBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT |
| IR3088M | 功能描述:IC XPHASE W/FAULT DET 20L-MLPQ RoHS:否 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:XPhase™ 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
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