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| 型号： | MAX1856EUB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC PS PWM SLIC SYNCH 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 应用： | 控制器，卫星接收机顶盒，xDSL 和线缆调制解调器 |
| 输入电压： | 3 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | -24V，-72V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-uMAX |
| 包装： | 管件 |
Wide Input Range, Synchronizable,
PWM SLIC Power Supply
Table 1. Transformer Selection for Standard Applications
INPUT VOLTS (V)
5
12
12
12
OUTPUT VOLTS (V)
-48
-48
-24 and -72
-95 and -30
OUTPUT CURRENT (mA)
100
100
400 or 100
320 and 150
TRANSFORMER (VENDOR)
VP3-0055 (Coiltronics)
CTX01-14853 (Coiltronics), or
ICA-0635 (ICE Components)
CTX01-14853 (Coiltronics), or
ICA-0635 (ICE Components)
CTX03-15220 (Coiltronics)
Table 2. Transformer Suppliers
VENDOR
Coilcraft
Coiltronics
ICE Components
Pulse Engineering
TDK
USA PHONE
847-639-6400
888-414-2645
800-729-2099
858-674-8100
847-390-4461
USA FAX
847-639-1469
561-241-9339
703-257-7547
858-674-8262
847-390-4405
INTERNET
www.coilcraft.com
www.coiltronics.com
www.icecomponents.com
www.pulseeng.com
www.tdk.com
gives 1.11A for 80% efficiency. With a duty cycle of
52.5%, the average switch current (I SW(AVG) ) is 2.114A.
Choosing a primary inductance ripple current ? I L to be
40% of the average switch current, the primary induc-
tance is given by:
For the standard application circuit (f OSC = 250kHz),
the EFD15 core from Coiltronics meets the criteria.
Once the core is chosen, the number of turns in the pri-
mary is given by:
L P =
V IN D
? I L ? OSC
N P =
L P
A L
Selecting f OSC = 250kHz and ? I L = 0.4 x I SW(AVG) =
0.846A, the primary inductance value is 27μH, and the
peak primary current for this example is therefore 2.5A.
Core Selection
The transformer in a flyback converter is a coupled
inductor with multiple windings on the same magnetic
core. Flyback topologies operate by storing energy in
the transformer magnetics during the on-time and
transferring this energy to the output during the off-
time.
where A L is the inductance factor. Ensure that the num-
ber of ampere-turns (N P I SAT ) is below the saturation
limit. A significant portion of the total energy is stored in
the air gap. Therefore, the larger the air gap, the lower
the A L value and the larger the number of ampere-turns
at which saturation starts. Some manufacturers define
saturation as the current at which the inductance
decreases by 30%.
Current-Sense Resistor Selection
Once the peak inductor current is determined, the cur-
rent-sense resistor (R CS ) is determined by:
Core selection depends on the core ’ s power-handling
capability. The required output power is first consid-
ered. For example, the standard application circuit
R CS =
V CS(MIN)
I LPEAK
= 85 mV / I LPEAK
requires 9.6W. Assuming a typical 80% efficiency, the
transformer must support 12W of power. The core
material ’ s properties, the core ’ s shape, and the size of
the air gap determine the core ’ s power rating. Since the
equations relating these properties to the power capa-
bility are involved, manufacturers simply provide charts
giving “ Power vs. Frequency ” for different core sizes.
Kelvin-sensing should be used to connect CS and
PGND to R CS . Connect PGND and GND together at the
ground side of R CS .
Due to inductive ringing after the MOSFET turns on, a
lowpass filter may be required between R CS and CS to
prevent the noise from tripping the current-sense com-
parator. Connect a 100 ? resistor between CS and the
12
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| MAX1856EUB+ | 功能描述:电信线路管理 IC Synchronizable PWM SLIC Power Supply RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| MAX1856EUB+T | 功能描述:电信线路管理 IC Synchronizable PWM SLIC Power Supply RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| MAX1856EUB-T | 功能描述:电信线路管理 IC RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| MAX1856EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1856 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX1857EUA47 | 功能描述:低压差稳压器 - LDO 500mA Ripple-Rejecting RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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