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参数资料
| 型号： | MAX5935EAX+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 16/44页 |
| 文件大小： | 700K |
| 描述： | IC CTRLR POWER QUAD 36-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 类型： | 以太网供电控制器（PoE） |
| 应用： | 远程外设（工业控制，相机，数据访问） |
| 内部开关： | 无 |
| 电源电压： | -32 V ~ -60 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-BSOP（0.295"，7.50mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 管件 |
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Overcurrent Protection
A sense resistor (R
S
), connected between SENSE_ and
V
EE
, monitors the load current. Under all circum-
stances, the voltage across R
S
never exceeds the
threshold V
SU_LIM
. If SENSE_ exceeds V
SU_LIM
, an
internal current-limiting circuit regulates the GATE volt-
age, limiting the current to I
LIM
= V
SU_LIM
/ R
S
. During
transient conditions, if the SENSE_ voltage exceeds
V
SU_LIM
, a fast pulldown circuit activates in order to
quickly recover from the current overshoot. During
startup, if the current-limit condition persists, when the
startup timer, t
START
, times out, the port shuts off and
the STRT_FLT_ bit is set. In the normal powered state,
the MAX5935 checks for overcurrent conditions as
determined by V
FLT_LIM
= ~88% of V
SU_LIM
. The
t
FAULT
counter sets the maximum-allowed continuous
overcurrent period. The t
FAULT
counter increases when
V
SENSE
exceeds V
FLT_LIM
and decreases at a slower
pace when V
SENSE
drops below V
FLT_LIM
. A slower
decrement for the t
FAULT
counter allows for detecting
repeated short-duration overcurrents. When the counter
reaches the t
FAULT
limit, the MAX5935 powers off the
port and asserts the IMAX_FLT_ bit. For a continuous
overstress, a fault latches exactly after a period of
t
FAULT
. V
SU_LIM
, is programmable using R27h[4-7].
t
FAULT
is programmable using R16h[2-3] and R28[4-7].
After power-off due to an overcurrent fault, and if the
RSTR_EN bit is set, the t
FAULT
timer is not immediately
reset but starts decrementing at the same slower pace.
The MAX5935 allows the port to be powered on only
when the t
FAULT
counter is at zero. This feature sets an
automatic duty-cycle protection to the external MOSFET
to avoid overheating. The duty cycle is programmable
using R16h[6-7].
The MAX5935 continuously flags when the current
exceeds the maximum current allowed for the class as
indicated in the CLASS status register. When class
overcurrent occurs, the MAX5935 sets the IVC bit in
register R09h.
Foldback Current
During startup and normal operation, an internal circuit
senses the voltage at OUT_ and reduces the current-
limit value when (V
OUT
_ - V
EE
) > 30V. The foldback
function helps to reduce the power dissipation on the
FET. The current limit eventually reduces to 1/3 of I
LIM
when (V
OUT
_ - V
EE
) > 50V (see Figure 4).
Quad Network Power Controller
for Power-Over-LAN
16 ______________________________________________________________________________________
Figure 2. Detection, Classification, and Power-Up Port
Sequence
OUT_
-4V
-9V
-18V
-48V
t
t
DETI
t
DETII
t
CLASS
150ms
150ms
21.3ms
0V
0V
80ms
Figure 3. PGOOD Timing
PGOOD
POK
t
PGOOD
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5935EAX+ | 功能描述:热插拔功率分布 Quad Network Power 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 |
| MAX5935EAX+T | 功能描述:热插拔功率分布 Quad Network Power 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 |
| MAX5935EAX-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 |
| MAX5936AAESA | 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 |
| MAX5936AAESA+ | 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 |
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