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| 型号： | MAX1856EUB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/18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
9 V CC
MUX
LDO
EXT
1
8
R3
ANTISAT
R2
R1
552k ?
0
1
PGND
7
4
REF
276k ?
276k ?
R
S
Q
V REF
1.25V
5
FB
1
MUX
0
6
CS
SLOPE COMP
X6
X1
1.0V
F OSC
FREQ
2
X1
3 GND
100mV
I MAX
F OSC /3
BIAS
10
15mV
Figure 2. Functional Diagram
I MIN
MAX1856
SYNC/SHDN
cuit (Figure 1) converting a +12V input to a -72V output
(maximum load 100mA) and a -24V output (maximum
load 400mA).
Maximum Output Power
es. Typically, 80% efficiency can be assumed for initial
calculations. The input power depends on the current
limit, input voltage, output voltage, inductor value, the
transformer ’ s turns ratio, and the switching frequency:
P IN ( MAX ) = V IN D ? CS ?
V IN D ?
2 ? OSC L ?
The maximum output power the MAX1856 can provide
depends on the maximum input power available and
the circuit ’ s efficiency:
? V
? R CS
?
P OUT ( MAX ) = EFFICIENCY × P IN ( MAX )
D =
N P V OUT
N P V OUT + N S V IN
Furthermore, the efficiency and input power are both
functions of component selection. Efficiency losses can
be divided into three categories: 1) resistive losses
across the transformer, MOSFET ’ s on-resistance, cur-
rent-sense resistor, and the ESR of the input and output
capacitors; 2) switching losses due to the MOSFET ’ s
transition region, the snubber circuit, which also
increases the transition times, and charging the MOS-
FET ’ s gate capacitance; and 3) transformer core loss-
where N P :N S is the transformer ’ s turns ratio.
Setting the Operating Frequency
(SYNC/ SHDN and FREQ)
The SYNC/ SHDN pin provides both external-clock syn-
chronization (if desired) and shutdown control. When
SYNC/ SHDN is low, all IC functions are shut down. A
logic high at SYNC/ SHDN selects operation at a
10
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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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