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| 型号： | MAX1856EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC PWR SPLY PWM SLIC 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
Wide Input Range, Synchronizable,
PWM SLIC Power Supply
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
NAME
LDO
FREQ
GND
REF
FB
CS
PGND
EXT
V CC
SYNC/ SHDN
FUNCTION
5V Linear Regulator Output. The regulator powers all of the internal circuitry, including the EXT gate
driver. Bypass LDO to GND with a 1μF or greater ceramic capacitor.
Oscillator Frequency Set Input. A resistor from FREQ to GND sets the oscillator from 100kHz (R OSC =
500k ? ) to 500kHz (R OSC = 100k ? ): f OSC = 50M ? -kHz / R OSC . The MAX1856 still requires R OSC when
an external clock is connected to SYNC/ SHDN .
Analog Ground
1.25V Reference Output. REF can source up to 400μA. Bypass to GND with a 2.2μF ceramic capacitor.
Feedback Input. The feedback voltage threshold is 0.
Positive Current-Sense Input. Connect a current-sense resistor (R CS ) between CS and PGND.
Power Ground
External MOSFET Gate-Driver Output. EXT swings from LDO to PGND.
Input Supply to the Linear Regulator. V CC accepts inputs up to 28V. Bypass to PGND with a 1μF
ceramic capacitor.
Shutdown Control and Synchronization Input. There are three operating modes:
? SYNC/ SHDN low: shutdown mode
? SYNC/ SHDN high: the DC-to-DC controller operates with the oscillator frequency set at FREQ by
R OSC
? SYNC/ SHDN clocked: the DC-to-DC controller operates with the oscillator frequency set by the SYNC
clock input. The conversion cycles initiate on the rising edge of the input clock signal. However, the
MAX1856 still requires R OSC when SYNC/ SHDN is externally clocked.
Detailed Description
The MAX1856 current-mode PWM controller uses an
inverting flyback configuration that is ideal for generat-
ing the high negative voltages required for SLIC power
supplies. Optimum conversion efficiency is maintained
over a wide range of loads by employing both PWM
operation and Maxim ’ s proprietary Idle Mode control to
minimize operating current at light loads. Other features
include shutdown, adjustable internal operating fre-
quency or synchronization to an external clock, soft-
start, adjustable current limit, and a wide (3V to 28V)
input range.
PWM Controller
The heart of the MAX1856 current-mode PWM con-
troller is a BiCMOS multi-input comparator that simulta-
neously processes the output-error signal, the
current-sense signal, and a slope-compensation ramp
(Figure 2). The main PWM comparator is direct sum-
ming, lacking a traditional error amplifier and its associ-
ated phase shift. The direct-summing configuration
approaches ideal cycle-by-cycle control over the out-
put voltage since there is no conventional error amplifi-
er in the feedback path.
In PWM mode, the controller uses fixed-frequency, cur-
rent-mode operation where the duty ratio is set by the
input-to-output voltage ratio and the transformer ’ s turn
ratio. The current-mode feedback loop regulates peak
inductor current as a function of the output error signal.
At light loads, the controller enters Idle Mode. During
Idle Mode, switching pulses are provided only as nec-
essary to supply the load, and operating current is min-
imized to provide the best light-load efficiency. The
minimum-current comparator threshold is 15mV, or
15% of the full-load value (I MAX ) of 100mV. When the
controller is synchronized to an external clock, Idle
Mode occurs only at very light loads.
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| 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 |
| MAX1857EUA47+T | 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 |
| MAX1857EUA47-T | 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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