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參數(shù)資料
| 型號： | LTC4268IDKD-1#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 11/46頁 |
| 文件大?。?/td> | 419K |
| 描述： | IC PD HIGH POWER W/CNTRL 32-DFN |
| 產(chǎn)品培訓(xùn)模塊： | Power over Ethernet |
| 標(biāo)準(zhǔn)包裝： | 52 |
| 類型： | 以太網(wǎng)供電開關(guān)（PoE） |
| 應(yīng)用： | 遠(yuǎn)程外設(shè)（工業(yè)控制，相機(jī)，數(shù)據(jù)訪問） |
| 內(nèi)部開關(guān)： | 是 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-DFN（7x4）裸露焊盤 |
| 包裝： | 管件 |
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42681fc
LTC4268-1
11
pin FuncTions
ance of the upper divider resistor. The user can control
the amount of hysteresis by adjusting the impedance of
the divider. Tie the UVLO pin to V
CC
if you are not using
this function. See the Applications Information for details.
This pin is used for the UVLO function of the switching
regulator. The PD interface section has an UVLO defined
by the IEEE 802.3af specification.
SENSE, SENSE+ (Pins 19, 20): Current Sense Inputs.
These pins are used to measure primary side switch cur-
rent through an external sense resistor. Peak primary side
current is used in the converter control loop. Make Kelvin
connections to the sense resistor R
SENSE
to reduce noise
problems. SENSE connects to the GND side. At maximum
current (V
CMP
at its maximum voltage) SENSE pins have
100mV threshold. The signal is blanked (ignored) during
the minimum turn-on time.
C
CMP
(Pin 21): Load Compensation Capacitive Control.
Connect a capacitor from C
CMP
to GND in order to reduce
the effects of parasitic resistances in the feedback sensing
path. A 0.1礔 ceramic capacitor suffices for most applica-
tions. Short this pin to GND in less demanding applications.
R
CMP
(Pin 22): Load Compensation Resistive Control.
Connect a resistor from R
CMP
to GND in order to com-
pensate for parasitic resistances in the feedback sensing
path. In less demanding applications, this resistor is not
needed and this pin can be left open. See Applications
Information for details.
PGDLY (Pin 23): Primary Gate Delay Control. Connect an
external programming resistor (R
PGDLY
) to set delay from
synchronous gate turn-off to primary gate turn-on. See
Applications Information for details.
PG (Pin 24): Primary Gate Drive. PG is the gate drive pin
for the primary side MOSFET Switch. Large dynamic cur-
rents flow during voltage transitions. See the Applications
Information for details.
NC (Pin 25): No Internal Connection.
V
NEG
(Pins 26, 27, 28): System Negative Rail. Tie to the
GND pin to supply power to the flyback controller through
the internal power MOSFET. V
NEG
is high impedance until
the input voltage rises above the UVLO turn-on threshold.
The output is then connected to V
PORTN
through a current-
limited internal MOSFET switch. Pins 26, 27 and 28 must
be electrically tied together.
PWRGD (Pin 29): Active High Power Good Output,
Open-Collector. Signals to the flyback controller that the
LTC4268-1 MOSFET is on and that the flyback controller
can start operation. High impedance indicates power is
good. PWRGD is referenced to V
NEG
and is low imped-
ance during inrush and in the event of a thermal overload.
PWRGD is clamped to 14V above V
NEG
.
PWRGD (Pin 30): Active Low Power Good Output, Open-
Drain. Signals to the DC/DC converter that the LTC4268-1
MOSFET is on and that the converter can start operation.
Low impedance indicates power is good. PWRGD is ref-
erenced to V
PORTN
and is high impedance during detec-
tion, classification and in the event of a thermal overload.
PWRGD has no internal clamps.
NC (Pin 31): No Internal Connection.
V
PORTP
(Pin 32): Positive Power Input. Tie to the input
port power return through the input diode bridge.
GND (Pin 33): Ground. This is the negative rail connec-
tion for both signal ground and gate driver grounds. This
pin should be connected to V
NEG
. Careful attention must
be paid to layout. See the Applications Information for
details.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4268IDKD-1-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Power PD with Synchronous NoOpto Flyback Controller |
| LTC4268IDKD-1-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Power PD with Synchronous NoOpto Flyback Controller |
| LTC4269-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:IEEE 802.3at PD with Synchronous No-Opto Flyback Controller |
| LTC4269-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support |
| LTC4269CDKD-1#PBF | 功能描述:IC PD/OPTO FLYBACK CTRLR 32-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
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