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參數(shù)資料
| 型號(hào)： | MAX1837 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
| 中文描述： | 24V內(nèi)置開關(guān)、100%占空比、降壓型轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 394K |
| 代理商： | MAX1837 |
M
24V Internal Switch, 100% Duty Cycle,
Step-Down Converters
8
_______________________________________________________________________________________
stant-frequency pulse-width-modulation (PWM) con-
trollers that switch the MOSFET unnecessarily.
When the output voltage is too low, an error comparator
sets a flip-flop, which turns on the internal P-channel
MOSFET and begins a switching cycle (Figure 3). As
shown in Figure 4, the inductor current ramps up linear-
ly, charging the output capacitor and servicing the
load. The MOSFET turns off when the current limit is
reached, or when the maximum on-time is exceeded
while the output voltage is in regulation. Otherwise, the
MOSFET remains on, allowing a duty cycle up to 100%
to ensure the lowest possible dropout voltage. Once
the MOSFET turns off, the flip-flop resets, diode D1
turns on, and the current through the inductor ramps
back down, transferring the stored energy to the output
capacitor and load. The MOSFET remains off until the
0.5μs minimum off-time expires and the inductor cur-
rent ramps down to zero, and the output voltage drops
back below the set point.
4
μ
s/div
CIRCUIT OF FIGURE 2, V
IN
= 12V
A. V
LX
, 5V/div
B. V
= 3.3V, 20mV/div, 200mA LOAD
C. INDUCTOR CURRENT, 500mA/div
10V
0
500mA
3.3V
A
B
C
0
Figure 4. Discontinuous-Conduction Operation
INPUT
4.5V OR 24V
C
IN
OUTPUT
3.3V OR 5V
D1
L1
C
OUT
MAX1836
MAX1837
IN
GND
LX
SHDN
FB
OUT
Q
MAXIMUM
ON-TIME
DELAY
TRIG
Q
MAXIMUM
OFF-TIME
DELAY
TRIG
Q
R
S
V
SENSE
V
SET
1.25V
100mV
Figure 3. Functional Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1836EUT33-T | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
| MAX1837EUT33-T | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
| MAX1836 | Replaced by TMS320BC52 : Digital Signal Processors 100-LQFP |
| MAX1837EUT50 | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
| MAX1837EUT50-T | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1837ESA33 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1837ETT33+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP DOWN 6TDFN EP - Rail/Tube |
| MAX1837ETT33+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 24V 100% Duty Cycle RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1837ETT50+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP DOWN 6TDFN EP - Rail/Tube |
| MAX1837ETT50+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 24V 100% Duty Cycle RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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