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参数资料
| 型号： | PCZ34670EG |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | 1.27 PITCH, ROHS COMPLIANT, PLASTIC, MS-013AC, SOIC-20 |
| 文件页数： | 5/24页 |
| 文件大小： | 986K |
| 代理商： | PCZ34670EG |
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
34670
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
CLASSIFICATION
A PD may optionally be classified by the PSE. The intent
of classification is to provide a method for more efficient
power allocation through the PSE. The PD classification
allows the PSE to identify four different (power) classes
depending on the required power that the PD will draw during
normal operation. The classes and the corresponding
maximum power drawn by the PD is shown in Table 6.
Table 6. PD Classes
PD CLASSES
During classification probing by the PSE, the PD applies
the appropriate load current onto the line. The PSE measures
the load current and can determine the classification as
described in Table 7.
.
CLASSIFICATION SIGNATURE LOAD CURRENT
The implementation for the classification circuitry is shown
in Figure 12.
Figure 12. Classification Circuitry
A constant voltage is applied at pin RCLA and depending
on the resistor RCLASS, a current from +VPORT to -VPORT is
flowing with the following relation:
ICLASS is the classification current that is measured by the
PSE. The values for the RCLASS resistor corresponding to the
appropriate class are listed in Table 8.
UVLO ADJUSTMENT
The 34670 has default UVLO settings that corresponds to
the IEEE 802.3af standard. Nevertheless the user can adjust
the UVLO by an external resistor divider as sketched in
Figure 13. Since the UVLO resistor divider replaces the
Class
Usage
Maximum Power
[W]
0
Default
0.44 - 12.95
1
Optional
0.44 - 3.84
2
Optional
3.84 - 6.49
3
Optional
6.49 - 12.95
4
Reserved
—
Table 7. PD Class vs. Classification Current
Class
Classification Current [mA]
Condition
Min
Max
0
4
14.5 - 20.5 Volts
measured at PD
input connector
1
9
12
2
17
20
3
26
30
4
36
44
Table 8. PD Class vs. Classification Resistor RCLASS
Class
Classification Current [mA]
RCLASS []
0
2.0
4.42k
1
10.5
475
2
18.5
261
3
28
169
4
40
113
+VPORT
-VPORT
RCLASS
RCLA
VPWR
VIN
34670
Vref
-
+
ICLASS
EN
I
CLASS
V
RCLA
R
CLASS
---------------------
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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