參數(shù)資料
型號(hào)： MAX5003EEE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： High-Voltage PWM Power-Supply Controller
中文描述： 1 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16
封裝： QSOP-16
文件頁數(shù)： 13/16頁
文件大小： 170K
代理商： MAX5003EEE
where:
DC = Duty cycle. Set to calculated minimum duty
cycle at V
MIN.
PWR
IN
= Input power, at maximum output power
This gives an inductance value (L
PRI
) of approxi-
mately 65μH.
5) The other parameter that defines the transformer is
peak current. This is given by:
The peak secondary current is the peak primary cur-
rent multiplied by the turns ratio, or 0.8A
·
8 = 6.4A.
Calculating the minimum duty cycle:
V
V
IN MIN
(
With these numbers, the transformer manufacturer
can choose a core.
6) For this application, the MAX5003 must be pro-
grammed for a maximum duty cycle of 55% at 36V.
The MAX5003 will automatically scale the limit with
the reciprocal of the input voltage as it changes. The
duty-cycle limit for an input voltage of 72V will be
27% (half of 55%). The duty cycle needed to stay out
of continuous conduction at 72V is 37%, so there is a
10% margin. The maximum duty time scales with the
voltage at the undervoltage lockout pin, V
INDIV
. The
voltage at INDIV is set by selecting the power line
undervoltage lockout trip point. The trip point for this
system, running from 36V to 72V, is 32V. Then INDIV
must be connected to the center point of a divider
with a ratio of 32/1.25, connected between the
power line and ground. Then R
MAXTON
is:
R
V
V
kHz
DC
V
k
V
V
kHz
kHz
k
k
MAXTON
MIN
UVL
36
32
SW
MAX
75
MIN
=
(
%
)
55
75
=
=
%
%
100
200
100
300
200
55
DC
DC
V
V
MIN
(
MAX
(
IN MAX
(
)
)
)
)
=
=
%
=
43
36
72
2. %
I
2 PWR
L
PRI
2 6.25W
65 H 300kHz
0.8A
PRI
IN
SW
=
=
=
M
High-Voltage PWM
Power-Supply Controller
______________________________________________________________________________________
13
10
μ
F
0.1
μ
F
51k
1.3k
R
CS
0.1
0.1
μ
F
0.1
μ
F
470nF
62k
V+
INDIV
ES
FREQ
SS
REF
CON
COMP
8
7
6
5
4
3
2
1
9
10
11
12
13
14
15
16
V
DD
V
CC
NDRV
PGND
CS
AGND
MDC217
IRFD620S
L
P
65
μ
H
MAXTON
FB
R2
39k
R1
1M
33
μ
F
0.1
μ
F
100
+5V
1A
-
51
680
240k
6
7
5
2
1
22
μ
F
0.01
μ
F
3900pF
24.9k
24.9k
TL431
4.7
μ
F
22
μ
F
MAX5003
V
IN
0V
XFACOILTRCTX03
CMSD4448
MBRS130L
8
2
5
7
9, 10
11, 12
-48V
-36V TO -72V
Figure 3. Application Example 2: Isolated -48V to +5V Converter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX5003EEE+ 功能描述:電壓模式 PWM 控制器 PWM Power-Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(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
MAX5003EEE+G39 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX5003EEE+T 功能描述:電壓模式 PWM 控制器 PWM Power-Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(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
MAX5003EEE-T 功能描述:電壓模式 PWM 控制器 PWM Power-Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(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
MAX5003ESE 功能描述:電壓模式 PWM 控制器 PWM Power-Supply Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(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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