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参数资料
| 型号： | MAX5931AEEP+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 18/23页 |
| 文件大小： | 331K |
| 描述： | IC HOT-SWAP CTRLR TRPL 20-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 1 V ~ 15 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-QSOP |
| 包装： | 带卷 (TR) |
Setting the Startup Period, R
TIM
The startup period (t
START
) is adjustable from 0.4ms to
50ms. The adjustable startup period feature allows sys-
tems to be customized for MOSFET gate capacitance
and board capacitance (C
BOARD
). The startup period is
adjusted with a resistor connected from TIM to GND
(R
TIM
). R
TIM
must be between 4k?and 500k? The
startup period has a default value of 9ms when TIM is left
unconnected. Calculate R
TIM
with the following equation:
where t
START
is the desired startup period.
Startup Sequence
There are two ways of completing the startup
sequence. Case A describes a startup sequence that
slowly turns on the MOSFETs by limiting the gate
charge. Case B uses the current-limiting feature and
turns on the MOSFETs as fast as possible while still
preventing a high inrush current. The output voltage
ramp-up time (t
ON
) is determined by the longer of the
two timings, case A and case B. Set the startup timer
(t
START
) to be longer than t
ON
to guarantee enough
time for the output voltage to settle.
Case A: Slow Turn-On (Without Current Limit)
There are two ways to turn on the MOSFETs without
reaching the fast-comparator current limit:
" If the board capacitance (C
BOARD
) is small, the
inrush current is low.
" If the gate capacitance is high, the MOSFETs turn
on slowly.
In both cases, the turn-on time is determined only by
the charge required to enhance the MOSFET. The
small 100礎 gate-charging current effectively limits
the output voltage dV/dt. Connecting an external
capacitor between GATE and GND extends the turn-
on time. The time required to charge/discharge a
MOSFET is as follows:
where:
C
GATE
is the external gate to ground capacitance
(Figure 9),
擵
GATE
is the change in gate charge,
Q
GATE
is the MOSFET total gate charge,
I
GATE
is the gate-charging/discharging current.
In this case, the inrush current depends on the MOSFET
gate-to-drain capacitance (C
RSS
) plus any additional
capacitance from GATE to GND (C
GATE
), and on any
load current (I
LOAD
) present during the startup period.
Example: Charging and discharging times using the
Fairchild FDB7030L MOSFET
If V
IN1
= 5V then GATE1 charges up to 10.4V (V
IN1
+
V
DRIVE
), therefore 擵
GATE
= 10.4V. The manufacturers
data sheet specifies that the FDB7030L has approxi-
mately 60nC of gate charge and C
RSS
= 600pF. The
MAX5930A/MAX5931A/MAX5931B have a 100礎 gate
charging current and a 3mA/50mA normal/strong dis-
charging current. C
BOARD
= 6礔 and the load does not
draw any current during the startup period. With no gate
capacitor, the inrush current, charge, and discharge
times are:
I
F
pF
A
A
t
V
nC
A
ms
V
nC
mA
ms
t
V
nC
mA
s
INRUSH
CHARGE
ISCHARGE NORMAL
DISCHARGE STRONG
=
?/DIV>
+
?/DIV>
+
=
=
?/DIV>
+
?/DIV>
=
=
?/DIV>
+
=
=
?/DIV>
+
=
6
600
0
100
0
1
0
10 4
60
100
0 6
0
10 4
60
3
0 02
0
10 4
60
50
1 2
.
.
.
.
.
.
(
)
(
)
?/DIV>
?/DIV>
I
C
C
C
I
I
INRUSH
BOARD
RSS
GATE
GATE
LOAD
=
+
?/DIV>
+
t
C
V
Q
I
GATE
GATE
GATE
GATE
=
?/DIV>
+
?/DIV>
R
t
pF
TIM
START
=
?/DIV>
128 800
Low-Voltage, Triple, Hot-Swap Controllers/
Power Sequencers/Voltage Trackers
18 ______________________________________________________________________________________
COMPONENT
MANUFACTURER
PHONE
WEBSITE
Vishay
402-563-6325
www.vishay.com
Sense Resistors
IRC, Inc.
361-992-7900
www.irctt.com
Fairchild Semiconductor
888-522-5372
www.fairchildsemi.com
International Rectifier
310-322-3331
www.irf.com
MOSFETs
ON Semiconductor
602-244-6600
www.onsemi.com
Table 7. Component Manufacturers
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PDF描述 |
|---|---|
| MAX5931BEEP+T | IC HOT-SWAP CTRLR TRPL 20-QSOP |
| LC5256MV-75F256I | IC XPLD 256MC 7.5NS 256FPBGA |
| RBM06DTAD | CONN EDGECARD 12POS R/A .156 SLD |
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| LC5256MV-5F256C | IC XPLD 256MC 5NS 256FPBGA |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5931BEEP+ | 功能描述:热插拔功率分布 Triple Hot-Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5931BEEP+T | 功能描述:热插拔功率分布 Triple Hot-Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5931HEEP | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5931HEEP+ | 功能描述:热插拔功率分布 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5931HEEP+T | 功能描述:热插拔功率分布 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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