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参数资料
| 型号： | MAX1836-MAX1837 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
| 中文描述： | 24V的内部开关，100％占空比，降压转换器 |
| 文件页数： | 11/13页 |
| 文件大小： | 394K |
| 代理商： | MAX1836-MAX1837 |
MAX1836/MAX1837 Stability
Commonly, instability is caused by excessive noise on
the feedback signal or ground due to poor layout or
improper component selection. When seen, instability
typically manifests itself as
“
motorboating,
”
which is
characterized by grouped switching pulses with large
gaps and excessive low-frequency output ripple during
no-load or light-load conditions.
PC Board Layout and Grounding
High switching frequencies and large peak currents
make PC board layout an important part of the design.
Poor layout may introduce switching noise into the
feedback path, resulting in jitter, instability, or degrad-
ed performance. High-power traces, bolded in the typi-
cal application circuits (Figures 1 and 2), should be as
short and wide as possible. Additionally, the current
loops formed by the power components (C
IN
, C
OUT
,
L1, and D1) should be as tight as possible to avoid
radiated noise. Connect the ground pins of these
power components at a common node in a star-ground
configuration. Separate the noisy traces, such as the
LX node, from the feedback network with grounded
copper. Furthermore, keep the extra copper on the
board, and integrate it into a pseudoground plane.
When using external feedback, place the resistors as
close to the feedback pin as possible to minimize noise
coupling. The MAX1837 evaluation kit shows the rec-
ommended layout.
Applications Information
High-Voltage Step-Down Converter
The typical application circuits
’
(Figures 1 and 2) com-
ponents were selected for 9V battery applications.
However, the MAX1836/MAX1837 input voltage range
allows supply voltages up to 24V. Figure 6 shows a
modified application circuit for high-voltage applica-
tions. When using higher input voltages, verify that the
input capacitor
’
s voltage rating exceeds V
IN(MAX)
and
that the inductor value exceeds the minimum induc-
tance recommended in the
Inductor Selection
section.
Inverter Configuration
Figure 7 shows the MAX1836/MAX1837 in a floating
ground configuration. By connecting what would nor-
mally be the output to the supply-voltage ground, the
IC
’
s ground pin is forced to regulate to -5V
(MAX183_EUT50) or -3.3V (MAX183_EUT33). Avoid
exceeding the maximum ratings of 24V between IN and
GND, and 5.5V between OUT and GND. Other negative
voltages may be generated by placing a resistive
divider across the output capacitor and connecting the
tap to FB in the same manner as the normal step-down
configuration.
M
24V Internal Switch, 100% Duty Cycle,
Step-Down Converters
______________________________________________________________________________________
11
SUPPLIER
PHONE
FAX
WEBSITE
INDUCTORS
Coilcraft
Coiltronics
Sumida USA
Toko
CAPACITORS
AVX
Kemet
Panasonic
Sanyo
Taiyo Yuden
DIODES
Central Semiconductor
International
Nihon
On Semiconductor
Zetex
847-639-6400
561-241-7876
847-956-0666
847-297-0070
847-639-1469
561-241-9339
847-956-0702
847-699-1194
www.coilcraft.com
www.coiltronics.com
www.sumida.com
www.tokoam.com
803-946-0690
408-986-0424
847-468-5624
619-661-6835
408-573-4150
803-626-3123
408-986-1442
847-468-5815
619-661-1055
408-573-4159
www.avxcorp.com
www.kemet.com
www.panasonic.com
www.secc.co.jp
www.t-yuden.com
516-435-1110
310-322-3331
847-843-7500
602-303-5454
516-543-7100
516-435-1824
310-322-3332
847-843-2798
602-994-6430
516-864-7630
www.centralsemi.com
www.irf.com
www.niec.co.jp
www.onsemi.com
www.zetex.com
Table 1. Component Suppliers
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PDF描述 |
|---|---|
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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/直流开关转换器 24V 100% Duty Cycle RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格: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/直流开关转换器 24V 100% Duty Cycle RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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