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| 型号： | MIC9131YQS |
| 厂商： | Micrel Inc |
| 文件页数： | 9/19页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR DC-DC PWM HV HS 16-QSOP |
| 标准包装： | 98 |
| 应用： | 控制器，电信 |
| 输入电压： | 9 V ~ 18 V |
| 输出数： | 1 |
| 输出电压： | 4.7 V ~ 5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
MIC9131
Functional Description
Micrel’s MIC9131 is a high voltage, high speed current mode
switching power supply controller. It uses a BiC/DMOS pro-
cess to achieve a high voltage input, low quiescent current
and very fast internal delay times. The MIC9131 is designed
to drive an external low side N-channel MOSFET, which
makes it suitable for controlling Boost, Flyback and Forward
converter topologies. The high voltage startup pin eliminates
the requirement for an external start up circuit. This makes
it ideal for use with Telecom converters.
A block diagram of the MIC9131 is shown in Figure 1. The de-
scription of the controller is divided into 6 basic functions:
? Power and bias circuitry
? High voltage start-up circuit
? V CC and Bias supplies
? Enable and Undervoltage monitoring circuits
? V CC and V IN UVLO
? Enable
? Oscillator and sync circuitry
? Soft-start and soft-start reset circuits
? MOSFET gate drive circuits
? Control loop operation
Transformer
Bias
Winding
Micrel, Inc.
? Current sensing & overcurrent protection
? Slope compensation
? Error ampli?er
High Voltage Start Up Circuit
Many conventional Off-Line and Telecom power supplies
use an external bias resistor and zener diode to supply the
initial start-up voltage for the control IC. The control IC gets
its supply voltage from a bias winding once the power sup-
ply is running. This method has the disadvantages of extra
components (diode and power resistor), continuous power
dissipation in the resistor and a large bias capacitor, used to
supply the IC until the bias winding takes over.
The MIC9131 eliminates these problems by using an internal
depletion mode MOSFET as a pre-regulator to provide the
start-up bias voltage from the high voltage input of the power
supply. This approach eliminates the need for external start
up components and reduces the size of the controller ’s bias
supply capacitor. The MOSFET is turned off once the external
bias winding takes over, which eliminates power dissipation
in the start-up circuit. In some cases, the MIC9131 may be
run directly from the input voltage rail, eliminating the need
for an external bias winding.
Start-up circuit operation is illustrated in Figure 2. V IN is ap-
MIC9131
VCC
2
Internal
Circuitry
1.21V
V IN
Line
1
180V
DEPLETION
FET
VCC
UVLO
THERMAL
SHUTDOWN
V PR(OFF) Depletion FET Pre-Regultor turn-off threshold
V PR
V GLO V CC Gate Lockout Hysteresis
V CC voltage when powered from V LINE
Figure 2
Depletion FET turn-on threshold
V GLO(ON) V CC gate lockout turn on threshold
August 2006
9
M9999-080206
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC9131YQS TR | 功能描述:电流型 PWM 控制器 SO-16 High Vin Telecom DC/DC PWM Control IC (Lead Free) RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MIC913BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC913BM5 TR | 功能描述:IC OPAMP 350MHZ HS LP SOT23-5 RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
| MIC913YM5 TR | 功能描述:运算放大器 - 运放 350MHz, 4.2mA High Speed Op Amp RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MIC913YM5-TR | 功能描述:Voltage Feedback Amplifier 1 Circuit SOT-23-5 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:Last Time Buy 放大器类型:电压反馈 电路数:1 输出类型:- 压摆率:500 V/μs 增益带宽积:350MHz -3db 带宽:240MHz 电流 - 输入偏置:5.5μA 电压 - 输入失调:1mV 电流 - 电源:4.2mA 电流 - 输出/通道:90mA 电压 - 电源，单/双（±）:±2.5 V ~ 9 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商器件封装:SOT-23-5 标准包装:1 |
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