參數(shù)資料
型號(hào)： MAX1864-MAX1865
廠商： Maxim Integrated Products, Inc.
元件分類： 數(shù)字信號(hào)處理
英文描述： Fixed-Point Digital Signal Processor 384-FC/CSP
中文描述： 的xDSL /電纜調(diào)制解調(diào)器的三/五級(jí)輸出電源
文件頁(yè)數(shù)： 11/25頁(yè)
文件大?。?/td> 384K
代理商： MAX1864-MAX1865
M
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
______________________________________________________________________________________
11
the voltage across the load. Under overload conditions,
when the inductor current exceeds the selected cur-
rent-limit (see
Current Limit
), the high-side MOSFET is
not turned on at the rising edge of the clock and the
low-side MOSFET remains on to let the inductor current
ramp down.
The MAX1864/MAX1865 operate in a forced-PWM
mode, so even under light loads the controller main-
tains a constant switching frequency to minimize cross-
regulation errors in applications that use a transformer.
The low-side gate-drive waveform is the complement of
the high-side gate-drive waveform, which causes the
inductor current to reverse under light loads.
Current-Sense Amplifier
The MAX1864/MAX1865s
’
current-sense circuit ampli-
fies (A
V
= 5) the current-sense voltage generated by
the high-side MOSFET
’
s on-resistance (R
DS(ON)
I
INDUCTOR
). This amplified current-sense signal and
the internal slope compensation signal are summed
together (V
SUM
) and fed into the PWM comparator
’
s
inverting input. The PWM comparator turns-off the high-
side MOSFET when V
SUM
exceeds the integrated feed-
back voltage (V
COMP)
. Place the high-side MOSFET no
further than 5mm from the controller, and connect IN
and LX to the MOSFET using Kelvin sense connections
to guarantee current-sense accuracy and improve
stability.
BST
C1
1
μ
F
D1
CENTRAL CMPSH-3
C2
1
μ
F
N
H
N
L
C
BST
0.1
μ
F
R
POK
100k
C
8.2nF
C
OUT
470
μ
F
C
IN
470
μ
F
DH
LX
T1
V
OUT
= 3.3V
1A
INPUT
9V TO 18V
DL
OUT
GND
IN
VL
ILIM
POK
COMP
MAX1864
FB
R
COMP
47k
R
DH
10
1
R
DL
10
R
BE2
220
R1
10k
C3
10
μ
F
Q1
V
OUT2
= 2.5V
300mA
C4
10
μ
F
T1
R2
10k
R
BE3
220
Q2
C6
10
μ
F
R3
30k
R4
10k
C7
10
μ
F
V
OUT3
= 5.0V
100mA
C5
470
μ
F
D2
NIHON EP05Q03L
B2
FB2
B3
FB3
C
4700pF
C
2200pF
NL, NH: INTERNATIONAL RECTIFIER
IRF7303
Q1: TIP30
Q2: 2N3905
Figure 1. Standard MAX1864 Application Circuit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1864TEEE 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel
MAX1864TEEE+ 功能描述:DC/DC 開關(guān)控制器 xDSL/Cable Modem Triple/Quint Output RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX1864TEEE+T 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 xDSL/Cable Modem Triple/Quint Output RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel
MAX1864TEEE-T 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel
MAX1864UEEE 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel
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