參數(shù)資料
型號: MAX5953DUTM+
廠商: Maxim Integrated
文件頁數(shù): 11/27頁
文件大小: 371K
描述: IC INTERFACE 802.3AF 48TQFN
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 43
類型: 以太網(wǎng)供電開關(guān)(PoE)
應(yīng)用: 遠程外設(shè)(工業(yè)控制,相機,數(shù)據(jù)訪問)
內(nèi)部開關(guān):
電源電壓: 11 V ~ 76 V
工作溫度: 0°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 48-TQFN-EP(7x7)
包裝: 管件
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
______________________________________________________________________________________   11
Pin Description (continued)
PIN
NAME
FUNCTION
25
OPTO
PWM Comparator Inverting Input. OPTO is referenced to GND. Connect the collector of the
optotransistor to OPTO and a pullup resistor to REGOUT.
26, 27
SRC
Source Connection of Low-Side Power MOSFET in the Two-Switch Power Stage of the DC-
DC Converter. Connect SRC to PGND with a low-value resistor for current limiting.
28, 29
XFRMRL
Low-Side Connection for the Isolation Transformer. Drain terminal of low-side power
MOSFET in the two-switch power stage of the DC-DC converter.
30
DRVIN
Supply Input for the Gate-Driver of Internal Power MOSFETs. DRVIN is referenced to
PGND. Bypass DRVIN with at least 0.1礔 to PGND. Connect DRVIN to REGOUT.
31, 32
XFRMRH
High-Side Connection for the Isolation Transformer. Source connection of high-side power
MOSFET in the two-switch power stage of the DC-DC converter.
33, 34
DRNH
Drain Connection of High-Side MOSFET in the Two-Switch Power Stage of the DC-DC
Converter. Connect DRNH to the most positive rail of the input supply. Bypass DRNH
appropriately to handle the heavy switching current through the transformer.
36
BST
Boost Input for the DC-DC Converter. BST is the boost connection point for the high-side
MOSFET driver. Connect a minimum 0.1礔 capacitor from BST to XFRMRH with short and
wide PC board traces.
37
DCUVLO
DC-DC Converter Undervoltage Lockout Input. DCUVLO is referenced to GND. Connect a
resistor-divider from HVIN to DCUVLO to GND to set the UVLO threshold.
39
HVIN
DC-DC Converter Positive Input Power Supply. HVIN is referenced to GND. Connect HVIN
to V+.
40
INBIAS
Input from the Rectified Bias Winding to the DC-DC Converter. INBIAS is referenced to
GND. INBIAS is the input to the internal linear voltage regulator (REGOUT).
41
REGOUT
Internal Regulator Output. REGOUT is used for the DC-DC converter gate driver. REGOUT
is referenced to GND. V
REGOUT
 is always present as long as HVIN is powered with a
voltage above the DCUVLO threshold. Bypass REGOUT to GND with a minimum 2.2礔
ceramic capacitor.
42
RTCT
Oscillator Frequency Set Input for the PWM Controller. RTCT is referenced to GND.
Connect a resistor from RTCT to REGOUT and a ceramic capacitor from RTCT to GND to
set the oscillator frequency.
43
FLTINT
Fault Integration Input for PWM Controller. FLTINT is referenced to GND. During persistent
current-limit faults, a capacitor connected to FLTINT is charged with an internal 80礎(chǔ)
current source. Switching is terminated when V
FLTINT
 reaches 2.7V. An external resistor
connected in parallel discharges the capacitor. Switching resumes when V
FLTINT
 drops
to 1.9V.
44
RCFF
Feed-Forward Input for PWM Controller. RCFF is referenced to GND. To generate the PWM
ramp, connect a resistor from RCFF to HVIN and a capacitor from RCFF to GND.
45
RAMP
Ramp Sense Input for PWM Controller. Connect RAMP to RCFF.

EP
Exposed Paddle. EP is internally unconnected and must be connected to V
EE
 externally.
To improve power dissipation, solder the exposed paddle to a copper pad on the PC
board.
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MAX5953DUTM+ 功能描述:電壓模式 PWM 控制器 IEEE 802.3af PD Int & PWM Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
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