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参数资料
| 型号： | MAX5921FESA+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/18页 |
| 文件大小： | 386K |
| 描述： | IC HOT-SWAP CTRLR -48V 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | -20 V ~ -80 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
-48V Hot-Swap Controllers with External
R
SENSE
and High Gate Pulldown Current
______________________________________________________________________________________ 11
Figure 10 shows how to program the undervoltage and
overvoltage trip thresholds using three resistors. With R4
= 549k&, R5 = 6.49k&, and R6 = 10k&, the undervolt-
age threshold is set to 38.5V (with a 43V release from
undervoltage), and the overvoltage is set to 71V. The
resistor-divider also increases the hysteresis and over-
voltage lockout to 4.5V and 2.8V at the input supply,
respectively.
PWRGD/PWRGD Output
Use the PWRGD (PWRGD) output to enable a power
module after hot insertion. Use the MAX59__A (PWRGD)
to enable modules with an active-low enable input
(Figure 12), or use the MAX59__B (PWRGD) to enable
modules with an active-high enable input (Figure 11).
The PWRGD signal is referenced to the DRAIN termi-
nal, which is the negative supply of the power module.
The PWRGD signal is referenced to V
EE
.
When the DRAIN voltage of the MAX5921A (see
Selector Guide for complete selection) or MAX5939A is
high with respect to V
EE
or the GATE voltage is low
from an undervoltage condition, then the internal pull-
down MOSFET Q2 is off. The PWRGD output goes into
a high-impedance state (Figure 13). PWRGD is pulled
high by the modules internal pullup current source,
turning the module off. When the DRAIN voltage drops
below V
DL
and the GATE voltage is greater than
V
GATE
- V
GH
, Q2 turns on and PWRGD pulls low,
enabling the module.
The PWRGD signal can also be used to turn on an LED
or optoisolator to indicate that the power is good (Figure
13) (see the Component Selection Procedure section).
When the DRAIN voltage drops below V
DL
and the
GATE voltage is greater than V
GATE
- V
GH
, MOSFET
Q3 turns on, shorting I
1
to V
EE
and turning Q2 off. The
pullup current in the module pulls the PWRGD high,
enabling the module.
When the DRAIN voltage of the MAX5921B/MAX5939B
(see Selector Guide for complete selection) is high with
respect to V
EE
(Figure 12) or the GATE voltage is low
due to an undervoltage condition, the internal MOSFET
Q3 is turned off so that I
1
and the internal MOSFET Q2
clamp PWRGD to the DRAIN turning off the module.
Once the PWRGD and PWRGD outputs are active, the
MAX5921/MAX5939 output does not toggle due to an
overvoltage (OV) fault.
GATE Voltage Regulation
GATE goes high when the following startup conditions
are met: UV is high, OV is low, the supply voltage is
above V
UVLOH
, and (V
SENSE
- V
EE
) is less than 50mV.
The gate is pulled up with a 45礎 current source and is
regulated at 13.5V above V
EE
. The MAX5921/MAX5939
include an internal clamp that ensures the GATE voltage
of the external MOSFET never exceeds 18V. During a
fast-rising V
DD
, an additional dynamic clamp keeps the
GATE and SENSE potentials as close as possible to pre-
vent the FET from accidentally turning on. When a fault
condition is detected, GATE is pulled low (see the Load
Current Regulation section).
GATE - V
EE
10V/div
DRAIN
50V/div
INRUSH
CURRENT
5A/div
1ms/div
Figure 7. Short-Circuit Protection Waveform
DRAIN
20V/div
V
EE
20V/div
I
D
(Q1)
2A/div
400祍/div
Figure 8. Voltage Step-On Input Supply
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5921FESA+ | 功能描述:热插拔功率分布 48V- 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 |
| MAX5921FESA+T | 功能描述:热插拔功率分布 48V- 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 |
| MAX5921FESA-T | 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 |
| MAX5922AEUI | 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 |
| MAX5922AEUI+ | 功能描述:热插拔功率分布 48V Single-Port Network Power Switch 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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