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| 型号： | MAX5965BEAX+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | High-Power, Quad, Monolithic, PSE Controllers for Power over Ethernet; Package: SSOP;36 pin;163 mm² ; Temperature: -40°C to +85°C |
| 中文描述： | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36 |
| 封装： | ROHS COMPLIANT, SSOP-36 |
| 文件页数： | 16/54页 |
| 文件大小： | 1525K |
| 代理商： | MAX5965BEAX+ |
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MAX5965A/MAX5965B
High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
______________________________________________________________________________________
23
Digital Logic
VDD supplies power for the internal logic circuitry. VDD
ranges from +3.0V to +5.5V and determines the logic
thresholds for the CMOS connections (SDAIN, SDAOUT,
SCL, AUTO, SHD_, A_). This voltage range enables the
MAX5965A/MAX5965B to interface with a nonisolated
low-voltage microcontroller. The MAX5965A/MAX5965B
check the digital supply for compatibility with the internal
logic. The MAX5965A/MAX5965B also feature a VDD
undervoltage lockout (VDDUVLO) of +2.0V. A VDDUVLO
condition keeps the MAX5965A/MAX5965B in reset and
the ports shut off. Bit 0 in the supply event register shows
the status of VDDUVLO (Table 12) after VDD has recov-
ered. All logic inputs and outputs reference to DGND.
For AC-disconnected detection, DGND and AGND must
be connected together externally. Connect DGND to
AGND at a single point in the system as close as possi-
ble to the MAX5965A/MAX5965B.
Hardware Shutdown
SHD_ shuts down the respective ports without using the
serial interface. Hardware shutdown offers an emer-
gency turn-off feature that allows a fast disconnect of
the power supply from the port. Pull SHD_ low to
remove power. SHD_ also resets the corresponding
events and status register bits.
Interrupt
The MAX5965A/MAX5965B contain an open-drain logic
output (INT) that goes low when an interrupt condition
exists. R00h and R01h (Tables 6 and 7) contain the defin-
itions of the interrupt registers. The mask register R01h
determines events that trigger an interrupt. As a response
to an interrupt, the controller reads the status of the event
register to determine the cause of the interrupt and takes
subsequent actions. Each interrupt event register also
contains a Clear on Read (CoR) register. Reading
through the CoR register address clears the interrupt. INT
remains low when reading the interrupt through the read-
only addresses. For example, to clear a startup fault on
the port 4 read address 09h (see Table 11). Use the glob-
al pushbutton bit in register 1Ah (bit 7, Table 23) to clear
interrupts, or use a software or hardware reset.
Undervoltage and
Overvoltage Protection
The MAX5965A/MAX5965B contain several undervoltage
and overvoltage protection features. Table 12 in the
Register Map and Description section shows a detailed
list of the undervoltage and overvoltage protection fea-
tures. An internal VEE undervoltage lockout (VEEUVLO) cir-
cuit keeps the MOSFET off and the MAX5965A/
MAX5965B in reset until VAGND - VEE exceeds 29V for
more than 3ms. An internal VEE overvoltage (VEE_OV) cir-
cuit shuts down the ports when (VAGND - VEE) exceeds
60V. The digital supply also contains an undervoltage
lockout (VDDUVLO). The MAX5965A/MAX5965B also fea-
ture three other undervoltage and overvoltage interrupts:
VEE undervoltage interrupt (VEE_UV), VDD undervoltage
interrupt (VDD_UV), and VDD overvoltage interrupt
(VDD_OV). A fault latches into the supply events register
(Table 12), but the MAX5965A/MAX5965B does not shut
down the ports with VEE_UV, VDD_UV, or VDD_OV.
DC Disconnect Monitoring
Setting R13h[DCD_EN_] bits high enables DC load moni-
toring during a normal powered state. If VRS (the voltage
across RS) falls below the DC load disconnect threshold,
VDCTH, for more than tDISC, the device turns off power
and asserts the LD_DISC_ bit of the corresponding port.
AC Disconnect Monitoring Features
(MAX5965B)
The MAX5965B features AC load disconnect monitor-
ing. Connect an external sine wave to OSC. The oscilla-
tor requirements are:
1) VP-P x Frequency = 200VP-P x Hz ±15%
2) Positive peak voltage > +2.2V
3) Frequency > 60Hz
A 100Hz ±10%, 2VP-P ±5%, with +1.3V offset (VPEAK =
+2.3V typical) is recommended.
The MAX5965B buffers and amplifiers three times the
external oscillator signal and sends the signal to DET_,
where the sine wave is AC-coupled to the output. The
MAX5965B senses the presence of the load by monitor-
ing the amplitude of the AC current returned to DET_
(see the
Functional Diagram).
Setting R13h[ACD_EN_] bits high enable AC load dis-
connect monitoring during a normal powered state. If
the AC current peak at the DET_ input falls below IACTH
for more than tDISC, the device turns off power and
asserts the LD_DISC_ bit of the corresponding port.
IACTH is programmable using R23h[2:0].
An internal comparator checks for a proper amplitude of
the oscillator input. If the positive peak of the input sinu-
soid falls below a safety value of 2V (typ), OSC_FAIL
sets and the port shuts down. Power cannot be applied
to the ports when ACD_EN_ is set high and OSC_FAIL
is set high. Leave OSC unconnected or connect it to
DGND when not using AC-disconnect detection.
Thermal Shutdown
If the MAX5965A/MAX5965B die temperature reaches
+150°C, an overtemperature fault generates and the
MAX5965A/MAX5965B shut down. The MOSFETs turn off.
The die temperature of the MAX5965A/MAX5965B must
cool down below +130°C to remove the overtemperature
fault condition. After a thermal shutdown, the part is reset.
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| MAX5965BEAX+ | 功能描述:热插拔功率分布 Quad PSE Controller for POE 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 |
| MAX5965BEAX+T | 功能描述:热插拔功率分布 Quad PSE Controller for POE 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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