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參數(shù)資料
| 型號： | MAX8541EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies |
| 中文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 328K |
| 代理商： | MAX8541EEE |
M
The MAX8540/MAX8541 also synchronize with an
external oscillator. Drive FREQ/SYNC with a square
wave through a series diode with a positive pulse width
of at least 200ns and a minimum pulse amplitude of 3V,
plus the V
F
of the external diode. Alternatively, a 1.5V
level-shifted external clock can be applied without the
series diode. The maximum duty cycle of the external
signal allowed is 55%. The MAX8540/MAX8541 syn-
chronize to frequencies between 200kHz and 1MHz;
however, the signal must be within
±
30% of the fre-
quency set by the external resistor at FREQ/SYNC.
Maximum Duty Cycle
Set the maximum duty cycle at the minimum system
input voltage (V
IN(MIN)
) connecting a resistor from
MAXDTY to GND. The maximum duty cycle is inversely
proportional to the voltage at UV. As the voltage on UV
increases, the duty cycle decreases. The maximum
duty cycle is internally limited to 80% at all switching
frequencies. The MAXDTY resistor is determined as:
where D
MAX
is the desired maximum duty cycle.
The range of valid resistor values for R
MAXDTY
is from
24.3k
to 130k
.
N-Channel MOSFET Driver
The DRV output drives an N-channel MOSFET in low-
power applications. In high-power applications, the gate
driver internal to the MAX8540/MAX8541 may not be
capable of driving the external MOSFET efficiently and
an external gate driver may be required. In this situation,
connect DRV to the input of the external gate driver.
Slope Compensation (MAX8540)
The MAX8540 is a current-mode device and requires
slope compensation for proper operation. To provide
slope compensation, connect a resistor from SCOMP to
GND (R
SCOMP
). The value of R
SCOMP
is determined as
follows.
For applications using a synchronous rectifier in the
output, set the slope compensation equal to the nega-
tive slope of the output inductor. R
SCOMP
is equal to:
where dV
RAMP
/dt = 2.5V(f
S
), R
SUM
= 25k
, N is the
turns ratio of the primary to secondary, L1 is the output
inductance, V
OUT
is the output voltage, f
S
is the switch-
ing frequency, and R
CS
is the current-sense resistance.
For applications where a diode is used in the output
instead of the synchronous rectifier, the slope compen-
sation resistor is then equal to:
where dV
RAMP
/dt = 2.5V(f
S
),R
SUM
= 25k
, N is the turns
ratio of the primary to secondary, L1 is the output induc-
tance, V
OUT
is the output voltage, V
F
is the diode voltage,
f
S
is the switching frequency, and R
CS
is the current-
sense resistance.
Voltage-Ramp Amplitude (MAX8541)
The MAX8541 is a voltage-mode device and features
adjustable voltage ramp. Connect a resistor from
PRAMP to GND (R
PRAMP
) to set the voltage-ramp
magnitude, V
M
.
V
V
k
R
M
PRAMP
=
1 25
25
.
R
dV
dt
R
2
SCF
SCOMP
RAMP
SUM
=
×
SCF
NV
V
L
R
OUT
F
CS
=
+
1
R
dV
dt
R
2
SCF
SCOMP
RAMP
SUM
=
×
SCF
NV
L
R
OUT
1
CS
=
R
D
MAXDTY
MAX
=
×
×
(
.
)
97 6
60
10
3
Synchronizable, High-Frequency Current- and
Voltage-Mode PWM Controllers for Isolated Supplies
10
______________________________________________________________________________________
C1
C2
C3
RA
RB
RC
V
36V TO 76V
MAX8541
OV
UV
Figure 1. A Method to Set UV and OV Thresholds
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8541EEE+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8541EEE-T | 功能描述:電壓模式 PWM 控制器 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 |
| MAX8543EEE | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| MAX8543EEE+ | 功能描述:電流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX8543EEE+T | 功能描述:電流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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