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參數(shù)資料
| 型號： | PCZ34670EG |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 1.27 PITCH, ROHS COMPLIANT, PLASTIC, MS-013AC, SOIC-20 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 986K |
| 代理商： | PCZ34670EG |
Analog Integrated Circuit Device Data
Freescale Semiconductor
11
34670
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 34670 combines a Power Interface Port for IEEE
802.3af Powered Devices (PD) and a high performance
current mode switching regulator. It allows a designer to build
PDs with a minimum of external components by means of
integrating the required IEEE 802.3af functions and all
functions necessary to build a high efficiency DC/DC
converter. Thus 34670 gives the system designer a device
that drastically reduces cost and board space.
On the PD side the 34670 fully supports the IEEE802.3af
standard and provides complete signature detection and
power classification functions. It controls inrush current
limiting and incorporates an adjustable undervoltage lockout.
The 34670 includes thermal protection circuitry to protect the
device in case of high power dissipation.
The 34670 also offers an input overvoltage detection to
protect the external switching MOSFET by disabling the gate
driver in case of input line overvoltage.
The switching regulator provides excellent line and load
regulation. It drives an external power MOSFET with sense
resistor. The switching frequency is adjustable between
100 kHz and 400 kHz. The output voltage feedback
information can be accomplished by an optocoupler, if
isolation is required.
An internal logic control block manages the sequencing of
signature detection, classification and proper turn on and turn
off of the DC/DC converter.
FUNCTIONAL PIN DESCRIPTION
POSITIVE SUPPLY VOLTAGE INPUT (VPWR)
This is the most positive power supply input. The load
connects between this pin and the V
OUT pin.
CLASSIFICATION RESISTOR (RCLA)
Connect a resistor between RCLA and VIN to select the
class of the PD.
UNDERVOLTAGE LOOKOUT (UVLO)
Used to adjust the undervoltage lookout threshold voltage,
connected to VIN to use the default threshold voltage.
TEST PINS (TEST1, TEST2)
Connect to VIN in application mode.
FREQUENCY ADJUSTMENT (FREQ)
Adjusts the internal oscillator frequency by connecting a
resistor between FREQ and VIN.
INRUSH CURRENT LIMIT (ILIM)
Used to adjust the inrush current limit of the isolation
switch, add a resistor between ILIM and VIN.
NEGATIVE SUPPLY VOLTAGE (VIN)
This is the most negative power supply input.
OUTPUT VOLTAGE (VOUT)
This pin is the drain of the internal Power MOSFET (high
current path and low current path).
RESET OUTPUT (RESET)
This is an active-low RESET output signal. This pin is
referenced to VOUT.
SOFT START INPUT (SS)
Connect an external capacitor to SS. The internal current
source charges the capacitor and generates a soft-start
ramp.
COMPENSATION PIN (COMP)
COMP is the output of the error amplifier and is available
for feedback compensation. COMP is pulled-up by an
internal 5.0 k
resistor to 5.0 V.
FEEDBACK INPUT (FB)
This is the inverting input of the error amplifier. In non-
isolated applications it’s connected to the secondary output
through a resistor divider.
CURRENT SENSE (CS)
The current sense pin CS senses a voltage that is
proportional to the current through the sense resistor.
GATE DRIVER OUTPUT (GATE)
GATE drives the gate of the external power MOSFET.
GATE sources and sinks up to 1.0 A.
VDD OUTPUT (VDD)
VDD mainly supplies the gate of the external power
MOSFET. Connect a capacitor from VDD to VOUT.
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| PD 1/2-0 | 制造商:TE Connectivity 功能描述:HEATSHRINK END CAP 12.7MM PK100 |
| PD 1/4-0 | 制造商:TE Connectivity 功能描述:HEATSHRINK END CAP 6.4MM PK100 制造商:TE Connectivity 功能描述:HEATSHRINK, END CAP, 6.4MM, PK100 制造商:TE Connectivity / Raychem 功能描述:HEATSHRINK, END CAP, 6.4MM, PK100; I.D. Supplied - Metric:6.4mm; I.D. Supplied - Imperial:0.251"; I.D. Recovered Max - Metric:2mm; I.D. Recovered Max - Imperial:0.078"; Shrink Ratio:3:1; Shrink Tubing / Boot Material:PO (Polyolefin);;RoHS Compliant: Yes |
| PD 1/8-0 | 制造商:TE Connectivity 功能描述:HEATSHRINK END CAP 3.2MM PK100 制造商:TE Connectivity 功能描述:HEATSHRINK, END CAP, 3.2MM, PK100 制造商:TE Connectivity 功能描述:HEATSHRINK, END CAP, 3.2MM, PK100, I.D. Supplied - Metric:3.2mm, I.D. Supplied - 制造商:TE Connectivity 功能描述:HEATSHRINK, END CAP, 3.2MM, PK100, I.D. Supplied - Metric:3.2mm, I.D. Supplied - Imperial:0.125", I.D. Recovered Max - Metric:0.58mm, I.D. Recovered Max - Imperial:0.022", Shrink Ratio:3:1, Shrink Tubing / Boot Material:PO , RoHS Compliant: Yes |
| PD 2436 | 制造商:Osram Opto semiconductors 功能描述:Bulk |
| PD 3/16-0 | 制造商:TE Connectivity 功能描述:HEATSHRINK END CAP 4.8MM PK100 制造商:TE Connectivity 功能描述:HEATSHRINK, END CAP, 4.8MM, PK100 |
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