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參數(shù)資料
| 型號： | LM5071 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Power Over Ethernet PD Controller with Auxiliary Power Power Over Ethernet PD Controller with Auxiliary Power |
| 中文描述： | 通過以太網(wǎng)PD控制器與輔助電源以太網(wǎng)供電PD控制器電源與輔助電源 |
| 文件頁數(shù)： | 3/18頁 |
| 文件大?。?/td> | 857K |
| 代理商： | LM5071 |
Pin Descriptions
Pin
1
Name
VIN
Description
Application Information
System high potential input.
The diode “OR” of several lines entering the PD, it is the more
positive input potential.
Connect a resistor from V
IN
to this pin for signature detection. The
resistor is in parallel with the UVLO resistors and should be valued
accordingly.
Connect the classification programming resistor from this pin to V
EE
.
A resistor divider between the AUX voltage input to VEE programs
the startup levels with a 2.5V threshold. A high value (
>
300k
)
internal pull down resistor is present to pull the pin low if it is left
open. In practice, the divider voltage should be set well above 2.5V
by the programming resistors.
An external resistor divider from V
IN
to UVLORTN programs the
shutdown levels with a 2.00V threshold at the UVLO pin. Hysteresis
is set by a switched internal 10uA current source that forces
additional current into the resistor divider.
Connect the bottom resistor of the resistor divider between the
UVLO pin and this pin.
Diode “OR’d” to the RJ45 connector and PSE’s –48V supply, it is
the more negative input potential.
The drain of the internal current limiting power MOSFET which
connects V
EE
to the return path of the dc-dc converter.
DC-DC converter gate driver output with 800mA peak sink current
capability.
When the auxiliary transformer winding (if used) raises the voltage
on this pin above the regulation set point, the internal series pass
regulator will shutdown, reducing the controller power dissipation.
Inverting input of the internal error amplifier. The non-inverting input
is internally connected to a 1.25V reference.
COMP pull-up is provided by an internal 5K resistor which may be
used to bias an opto-coupler transistor.
Current sense input for current mode control and over-current
protection. Current limiting is accomplished using a dedicated
current sense comparator. If the CS pin voltage exceeds 0.5V the
OUT pin switches low for cycle-by-cycle current limiting. CS is held
low for 50ns after OUT switches high to blank leading edge current
spikes.
An external resistor connected from RT to ARTN sets the oscillator
frequency. This pin will also accept narrow ac-coupled
synchronization pulses from an external clock.
An external capacitor and an internal 10uA current source set the
soft-start ramp rate.
RTN for sensitive analog circuitry including the SMPS current limit
amplifier.
2
RSIG
Signature resistor pin.
3
4
RCLASS
AUX
Classification resistor pin.
Auxiliary input power startup pin.
5
UVLO
Line under-voltage lockout.
6
UVLORTN
Return for the external UVLO resistors.
7
VEE
System low potential input.
8
RTN
System return for the PWM converter.
9
OUT
Output of the PWM controller.
10
V
CC
Output of the internal high voltage
series pass regulator. Regulated output
voltage is nominally 7.8V.
Feedback signal.
11
FB
12
COMP
The output of the error amplifier and
input to the Pulse Width Modulator.
Current sense input.
13
CS
14
RT / SYNC Oscillator timing resistor pin and
synchronization input.
15
SS
Soft-start input.
16
ARTN
Analog PWM supply return.
L
www.national.com
3
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| LM5071EVAL | 功能描述:BOARD EVALUATION LM5071 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise® 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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| LM5071MT-50-NOPB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LM5071 Power Over Ethernet PD Controller with Auxiliary Power Interface |
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