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10G050-2L PDF预览

10G050-2L

更新时间： 2024-02-16 21:04:09
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其他 - ETC /
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24页 464K
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Interface IC

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10G050-2L 技术参数

生命周期：Obsolete包装说明：,
Reach Compliance Code：unknown风险等级：5.84
Base Number Matches：1

10G050-2L 数据手册

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19-3024; Rev 0; 10/03  
IEEE 802.3af Power-Over-Ethernet  
Interface/PWM Controller for Power Devices  
General Description  
Features  
The MAX5942A/MAX5942B integrate a complete power  
IC for powered devices (PD) in a power-over-ethernet  
(PoE) system. The MAX5942A/MAX5942B provide a PD  
interface and a compact DC-DC PWM controller suitable  
for flyback and forward converters in either isolated or  
nonisolated designs.  
o Powered Device Interface  
Fully Integrated IEEE 802.3af-Compliant PD  
Interface  
PD Detection and Programmable Classification  
Signatures  
Less than 10µA Leakage Current Offset During  
Detection  
Integrated MOSFET for Isolation and Inrush  
Current Limiting  
Gate Output Allows External Control of the  
Internal Isolation FET  
Programmable Inrush Current Control/ULVO  
PGOOD/PGOOD Outputs Enable PWM  
Controller  
The MAX5942A/MAX5942B PD interface complies with  
the IEEE 802.3af standard, providing the PD with a detec-  
tion signature, a classification signature, and an integrat-  
ed isolation switch with programmable inrush current  
control. These devices also feature power-mode under-  
voltage lockout (UVLO) with wide hysteresis and power-  
good status outputs.  
The MAX5942A/MAX5942B also integrate all the build-  
ing blocks necessary for implementing DC-DC fixed-  
frequency isolated power supplies. This device is a  
current-mode controller with an integrated high startup  
circuit suitable for isolated telecom/industrial voltage  
range power supplies. A high-voltage startup circuit  
allows the PWM controller to draw power directly from the  
18V to 67V input supply during startup. The switching  
frequency is internally trimmed to 275kHz 10ꢀ, thus  
reducing magnetics and filter components. The  
MAX59412A allows an 85ꢀ operating duty cycle and can  
be used to implement flyback converters. The MAX5942B  
limits the operating duty cycle to less than 50ꢀ and can  
be used in single-ended forward converters. The  
MAX5942A/MAX5942B are designed to work with or with-  
out an external diode bridge in front of the PD.  
o PWM Controller  
Wide Input Range: 18V to 67V  
Isolated (Without Optocoupler) or Nonisolated  
Power Supply  
Current-Mode Control  
Leading-Edge Blanking  
Internally Trimmed 275kHz 10ꢀ Oscillator  
Soft-Start  
Ordering Information  
PIN-  
MAX DUTY  
PACKAGE CYCLE (ꢀ)  
PART  
TEMP RANGE  
MAX5942AESE* -40°C to +85°C  
MAX5942ACSE 0°C to +70°C  
MAX5942BESE* -40°C to +85°C  
MAX5942BCSE  
*Future product—contact factory for availability.  
16 SO  
16 SO  
16 SO  
85  
85  
50  
50  
The MAX5942A/MAX5942B are available in 16-pin SO  
packages.  
Applications  
0°C to +70°C 16 SO  
IP Phones  
Wireless Access Nodes  
Internet Appliances  
Computer Telephony  
Security Cameras  
Pin Configuration  
TOP VIEW  
V+  
1
2
3
4
5
6
7
8
16 V  
CC  
Power Devices in Power-Over-Ethernet/  
Power-Over-MDI  
V
DD  
15 NDRV  
14 V-  
FB  
SS_SHDN  
ULVO  
MAX5942A  
MAX5942B  
13 CS  
12 GND  
11 PGOOD  
10 PGOOD  
RCL  
Typical Operating Circuit appears at end of data sheet.  
GATE  
V
9
OUT  
EE  
SO  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...24

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