參數(shù)資料
型號(hào)： MAX5020ESA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： Analog IC
中文描述： 1 A SWITCHING CONTROLLER, 302 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, SOIC-8
文件頁(yè)數(shù)： 11/14頁(yè)
文件大?。?/td> 328K
代理商： MAX5020ESA
1) 36V
≤
V
IN
≤
72V, V
OUT
= 5V, I
OUT
= 10A, V
RIPPLE
≤
50mV
2) To set the output voltage calculate the values of
resistors R1 and R2 according to the following
equation:
where V
REF
is the reference voltage of the shunt
regulator, and R
1
and R
2
are the resistors shown in
Figures 2 and 3.
3) The turns ratio of the transformer is calculated based
on the minimum input voltage and the lower limit of
the maximum duty cycle for the MAX5020 (44%). To
enable the use of MOSFETs with drain-source
breakdown voltages of less than 200V use the
MAX5020 with the 50% maximum duty cycle.
Calculate the turns ratio according to the following
equation:
(
×
where:
N
S
/N
P
= Turns ratio (N
S
is the number of secondary
turns and N
P
is the number of primary turns).
V
OUT
= Output voltage (5V).
V
D1
= Voltage drop across D1 (typically 0.5V for
power Schottky diodes).
D
MAX
= Minimum value of maximum operating duty
cycle (44%).
V
IN_MIN
= Minimum Input voltage (36V).
In this example:
Choose N
P
based on core losses and DC resis-
tance. Use the turns ratio to calculate N
S
, rounding
up to the nearest integer. In this example N
P
= 14
and N
S
= 5.
For a forward converter choose a transformer with a
magnetizing inductance in the neighborhood of
200μH. Energy stored in the magnetizing inductance
of a forward converter is not delivered to the load
and must be returned back to the input; this is
accomplished with the reset winding.
The transformer primary to secondary leakage
inductance should be less than 1μH. Note that all
leakage energy will be dissipated across the MOS-
FET. Snubber circuits may be used to direct some or
all of the leakage energy to be dissipated across a
resistor.
To calculate the minimum duty cycle (D
MIN
) use the
following equation:
D
V
IN_MAX
where V
IN_MAX
is the maximum input voltage (72V).
4) The reset winding turns ratio (N
R
/N
P
) needs to be
low enough to guarantee that the entire energy in
the transformer is returned to V+ within the off cycle
at the maximum duty cycle. Use the following equa-
tion to determine the reset winding turns ratio:
where:
N
R
/N
P
= Reset winding turns ratio.
D
MAX
’
= Maximum value of Maximum Duty Cycle.
Round N
R
to the nearest smallest integer.
The turns ratio of the reset winding (N
R
/N
P
) will
determine the peak voltage across the N-channel
MOSFET.
Use the following equation to determine the maxi-
mum drain-source voltage across the N-channel
MOSFET:
V
DSMAX
= Maximum MOSFET drain-source voltage.
V
IN_MAX
= Maximum input voltage.
V
V
1 + N
N
DSMAX
IN_MAX
P
R
≥
×
N
1
1-0.5
0.5
R
≤
×
=
4
14
N
N
1-D
D
R
P
MAX
MAX
≤
×
′
′
V
N
N
- V
MIN
OUT
S
P
D1
=
×
N
N
5V+ 0.5V
0 44 36
.
0.44
V
S
P
≥
×
)
=
0 330
.
N
N
V
V
D
D
V
S
P
OUT
D1
MAX
MAX
IN_MIN
≥
+
×
)
V
V
R
R
V
V
V
OUT
REF
1
2
REF
SS_
+
k
<<
=
1
50
2 4
.
1
2
R
R
//
SHDN
M
Current-Mode PWM Controllers with Integrated
Startup Circuit
______________________________________________________________________________________
11
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參數(shù)描述
MAX5020ESA+ 功能描述:電流型 PWM 控制器 w/Integrated Startup RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX5020ESA+T 功能描述:電流型 PWM 控制器 w/Integrated Startup RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX5020ESA+TG035 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX5020ESA-G05 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX5020ESA-T 功能描述:電流型 PWM 控制器 w/Integrated Startup RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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