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参数资料
| 型号： | LTC4269IDKD-2#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32 |
| 封装： | 7 X 4 MM, PLASTIC, M0-229, DFN-32 |
| 文件页数： | 2/34页 |
| 文件大小： | 383K |
| 代理商： | LTC4269IDKD-2#TR |
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LTC4269-2
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pin FuncTions
SHDN (Pin 1): Shutdown Input. Use this pin for auxiliary
power application. Drive SHDN high to disable LTC4269-2
operation and corrupt the signature resistance. If unused,
tie SHDN to VPORTN.
T2P (Pin 2): Type-2 PSE Indicator, Open-Drain. Low
impedance indicates the presence of a Type-2 PSE.
RCLASS (Pin 3): Class Select Input. Connect a resistor
between RCLASS and VPORTN to set the classification load
current.
VPORTN(Pins5,6):PowerInput.TietothePDinputthrough
the diode bridge. Pins 5 and 6 must be electrically tied
together at the package.
NC (Pins 4, 7, 8, 25, 30, 31): No Connect.
COMP (Pin 9): Output Pin of the Error Amplifier. The error
amplifier is an op amp, allowing various compensation
networks to be connected between the COMP pin and
FB pin for optimum transient response in a nonisolated
supply. The voltage on this pin corresponds to the peak
current of the external FET. Full operating voltage range is
between 0.8V and 2.5V corresponding to 0mV to 220mV
at the ISENSE pin. For applications using the 100mV OC
pin for overcurrent detection, typical operating range for
the COMP pin is 0.8V to 1.6V. For isolated applications
where COMP is controlled by an opto-coupler, the COMP
pin output drive can be disabled with FB = VREF, reducing
the COMP pin current to (COMP – 0.7)/40k.
FB(Pin10):Inanonisolatedsupply,FBmonitorstheoutput
voltage via an external resistor divider and is compared
with an internal 1.23V reference by the error amplifier. FB
connected to VREF disables error amplifier output.
ROSC (Pin11): A resistor to GND programs the operating
frequency of the IC between 100kHz and 500kHz. Nominal
voltage on the ROSC pin is 1.0V.
SYNC (Pin 12): Used to synchronize the internal oscillator
to an external signal. It is directly logic compatible and
can be driven with any signal between 10% and 90% duty
cycle. If unused, the pin should be connected to GND.
SS_MAXDC (Pin 13): The external resistor divider from
VREF sets the maximum duty cycle clamp (SS_MAXDC =
1.84V, SD_VSEC = 1.32V gives 72% duty cycle). Capacitor
on SS_MAXDC pin in combination with external resistor
divider sets soft-start timing.
VREF (Pin 14): The output of an internal 2.5V reference
which supplies internal control circuitry. Capable of sourc-
ing up to 2.5mA drive for external use. Bypass to GND
with a 0.1F ceramic capacitor.
SD_VSEC (Pin 15): The SD_VSEC pin, when pulled below
its accurate 1.32V threshold, is used to turn off the IC and
reduce current drain from VIN. The SD_VSEC pin is con-
nectedtosysteminputvoltagethrougharesistordividerto
define undervoltage lockout (UVLO) for the power supply
and to provide a volt-second clamp on the OUT pin. An
11A pin current hysteresis allows external programming
of UVLO hysteresis.
GND (Pin 16): Analog Ground. Tie to VNEG.
BLANK (Pin 17): A resistor to GND adjusts the extended
blanking period of the overcurrent and current sense
amplifier outputs during FET turn-on—to prevent false
current limit trip. Increasing the resistor value increases
the blanking period.
ISENSE (Pin 18): The Current Sense Input for the Control
Loop. Connect this pin to the sense resistor in the source
of the external power MOSFET. A resistor in series with
the ISENSE pin programs slope compensation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4269IDKD-2-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support |
| LTC4270 | 制造商:LINER 制造商全称:Linear Technology 功能描述:12-Port PoE/PoE+/LTPoE++ PSE Controller |
| LTC4270/ | 制造商:LINER 制造商全称:Linear Technology 功能描述:8-Port PoE/PoE PSE Controller |
| LTC4270_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:12-Port PoE/PoE+/LTPoE++ PSE Controller |
| LTC4270AIUKG#PBF | 制造商:Linear Technology 功能描述:POE Controller 90W 52-Pin QFN EP 制造商:Linear Technology 功能描述:Bulk 制造商:Linear Technology 功能描述:IC POE LTPOE 12-PORT PSE 52-QFN 制造商:Linear Technology 功能描述:PSE CNTRL 12 PORT 90W 1MHZ 制造商:Linear Technology 功能描述:IC PSE CONTROLLER 3.3V QFN-52 制造商:Linear Technology 功能描述:IC, PSE CONTROLLER, 3.3V, QFN-52; Input Voltage:3.3V; Supply Current:10mA; UVLO:25V; Digital IC Case Style:QFN; No. of Pins:52; Frequency:1MHz; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:52-QFN ;RoHS Compliant: Yes |
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