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参数资料
| 型号： | MAX1856EUB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/18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
INPUT
3V TO 28V
C IN
T1
D1
OUTPUT
R5
C4
9
10
V CC
SYNC/SHDN
R4
C3
C1
MAX1856
EXT
8
M1
R7
1
LDO
CS
6
R6
C6
C LDO
2 FREQ
C5
R CS
R OSC
FB
5
3 GND
R3
C FB
R1
7
PGND
REF
4
C REF
Figure 3. Feedback Compensation and Snubber Circuits
R 7 =
t ?
C 6
SLIC Power Supply with Split Feedback
Telephones in broadband systems use low-power-con-
suming SLICs that reduce the power drain by providing
This gives a value of about 22 ? for R7. However, this
snubber adds capacity to the MOSFET output, and this
in turn increases the dissipation in the MOSFET during
turn-on.
The selection of the input and output snubbers is an
interactive process. The design procedures above pro-
vide initial component recommendations, but the actual
values depend on the layout and transformer winding
practices used in the actual application.
Applications Information
Voice-over-IP CPE systems have +5V or +12V available
from which the talk battery voltage and the ringer volt-
age must be generated. The examples given below are
circuits using these supply voltages to generate the
negative power supplies needed in such applications.
Low Input Voltage
IP phones and routers require -48V. For cost-sensitive
applications, this needs to be used from an available
+5V supply. The circuit in Figure 4 is an example of
such a circuit using an off-the-shelf transformer from
Coiltronics and ICE components.
the option of using two voltages for loop supervision.
The load on each output is dependent on the number
of lines on- or off-hook. The higher voltage is used to
generate ring battery voltage when the subscriber is on-
hook, while a second lower voltage is used to generate
talk battery voltage when off-hook is detected. The actu-
al value of these two voltages can be adjusted based on
system requirements and the specific SLIC used. The
design given here specifically addresses the supply
requirements for the AMD79R79 SLIC device with on-
chip ringing. The input voltage is 12V nominal, and the
output voltages are -24V at 400mA and -72V at 100mA.
The transformer turns ratio is 1:2:2:2, where 24V appears
across each secondary winding. The -72V output is
derived from the -24V output by stacking the secondary
windings in series as shown in Figure 1. A split feedback
is used, using resistors R1, R2, and R3. This allows for
accurate regulation of both outputs (see Typical
Operating Characteristics ).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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