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| 型号： | MAX774CSA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR INV PWM 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 300kHz |
| 占空比： | 85% |
| 电源电压： | 3 V ~ 16.5 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1409 (CN2011-ZH PDF) |
-5V/-12V/-15V or Adjustable, High-Efficiency,
Low I Q Inverting DC-to-DC Controllers
Table 1. Component Suppliers
SUPPLIER PHONE
INDUCTORS
FAX
output ripple when generating -5V at 1A from a 5V
input. Smaller capacitors are acceptable for lighter
loads or in applications that can tolerate higher output
ripple.
? V P-P = _____________________ + _________________
V IN
Coiltronics
Gowanda
Sumida Japan
Sumida USA
CAPACITORS
Kemet
Matsuo
Nichicon
Sanyo Japan
Sanyo USA
Sprague
United Chemi-Con
DIODES
Motorola
Nihon USA
Nihon Japan
POWER MOSFETS
Harris
International Rectifier
Siliconix
(407) 241-7876
(716) 532-2234
81-3-3607-5111
(708) 956-0666
(803) 963-6300
(714) 969-2491
(708) 843-7500
81-7-2070-6306
(619) 661-6835
(603) 224-1961
(714) 255-9500
(800) 521-6274
81-3-3494-7411
(805) 867-2555
(407) 724-3729
(310) 322-3331
(408) 988-8000
(407) 241-9339
(716) 532-2702
81-3-3607-5144
(708) 956-0702
(803) 963-6322
(714) 960-6492
(708) 843-2798
81-7-2070-1174
(619) 661-1055
(603) 224-1430
(714) 255-9400
(602) 952-4190
81-3-3494-7414
(805) 867-2556
(407) 724-3937
(310) 322-3332
(408) 970-3950
The value of C4 is chosen such that it acquires as
small a charge as possible during the switch on-time.
The amount of ripple as a function of capacitance is
give by:
V OUT x I OUT x ESR I OUT x t OFF(min)
C
When evaluating this equation, be sure to use the
capacitance value at the switching frequency. At
200kHz, the 330μF tantalum capacitor of Figures 2, 3,
or 4 may degrade by a factor of ten, which will signifi-
cantly alter the ripple voltage calculation.
The ESR of both the bypass and filter capacitors also
affects efficiency. Best performance is obtained by
doubling up on the filter capacitors or using low-ESR
capacitors. Capacitors must have a ripple current rat-
ing equal to the peak current.
The smallest low-ESR SMT capacitors currently avail-
able are the Sprague 595D series. Sanyo OS-CON
organic semiconductor through-hole capacitors also
exhibit low ESR and are especially effective at low tem-
peratures. Table 1 lists the phone numbers of these
and other manufacturers.
CURRENT-SENSE RESISTORS
PC Layout and Grounding
IRC
(704) 264-8861
(704) 264-8866
Due to high current levels and fast switching wave-
forms, proper PC board layout is essential. Use a star
Capacitors
Choose the output capacitor (C4 of Figures 2, 3, and 4)
to be consistent with size, ripple, and output voltage
requirements. Place capacitors in parallel if the size
desired is unobtainable. This will not only increase the
capacitance, but also decrease the capacitor’s ESR (a
major contributor of ripple). A 330μF tantalum output filter
capacitor with 0.07 ? ESR typically maintains 120mV P-P
ground configuration; connect the ground lead of the
input bypass capacitor, the output capacitor, the induc-
tor, and the GND pin of the MAX774/MAX775/MAX776
at a common point very close to the device. Addi-
tionally, input capacitor C2 (Figures 3 and 4) should be
placed extremely close to the device.
If an external resistor divider is used (Figures 3 and 4),
the trace from FB to the resistors must be extremely short.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX774CSA+ | 功能描述:DC/DC 开关控制器 5/12/15/AdjV- Inv DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX774CSA+T | 功能描述:DC/DC 开关控制器 5/12/15/AdjV- Inv DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX774CSA+TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX774CSA-T | 功能描述:DC/DC 开关控制器 5/12/15/AdjV- Inv DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX774CSA-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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