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参数资料
| 型号： | MIC9130YM |
| 厂商： | Micrel Inc |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR DC-DC PWM HV HS 16-SOIC |
| 标准包装： | 48 |
| 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-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1086 (CN2011-ZH PDF) |
| 其它名称： | 576-2417 MIC9130YM-ND |
MIC9130
MIC9130
4 μ A
5V
Micrel, Inc.
SET
12
SS
S
Q
V IN
V CC
A GND
2
11
1.21V
VCC
UVLO
UVLO
R
RESET
/Q
16
OUT
R1
R2
UVLO
13
LINE
UVLO
15
PGND
Figure 4: UVLO and Soft Start Circuits
V LINE_ON = V THRESHOLD ×
V HYSTERESIS = V HYST ×
( V THRESHOLD HYST ) × R1 R2 R2
? V
V CC Undervoltage Lockout
The V CC voltage is internally divided down and compared to
a 1.21V internal bandgap reference. As V CC rises above the
turn-on threshold, it disables the Vcc undervoltage lockout
circuit. Once above the turn-on threshold, hysteresis prevents
the lockout circuit from disabling the IC until the V CC voltage
falls below the lower threshold.
Line Undervoltage Circuit (UVLO)
The line voltage is monitored by an external resistor divider
and fed into the negative input of the line UVLO comparator.
As the comparator trip point is exceeded, the line UVLO circuit
is disabled. Hysteresis built into the comparator prevents the
circuit from toggling on an off in the presence of noise or a
high input line impedance.
The line voltage turn-on trip point is:
R1 + R2
R2
where: V THRESHOLD is the voltage level of the internal
comparator reference, typically 1.21V.
The line hysteresis is equal to:
R1 + R2
R2
where: V HYST is the internal hysteresis level, typically
75mV.
V HYSTERESIS is the hysteresis of the line input
voltage
The MIC9130 will be disabled when the line voltage drops
back down to:
V LINE_OFF = V LINE_ON ? V HYTERESIS =
+
Enable
A low level on the enable pin turns off all the functions of the
MIC9130 and places it in a low quiescent current state. The
output driver is in a low state. When the enable pin is pulled
high, the MIC9130 goes through its normal start up sequence
including undervoltage lock out and soft start. When not used,
the pin should be connected to V CC .
Oscillator Block
An external resistor and capacitor set the oscillator frequency.
The MIC9130 contains an internal divide-by-two circuit that
limits the maximum duty cycle at the gate drive to 50%.
The oscillator frequency for the MIC9130 is twice the output
switching frequency.
Oscillator Pin
The operation of the oscillator is shown in Figure 5. The volt-
age waveform at the OSC pin is a sawtooth whose amplitude
increases as capacitor Cosc is charged up through R OSC from
the 5V bias. When the OSC pin voltage reaches the internal
comparator upper threshold, C OSC is quickly discharged to
zero volts by an internal MOSFET. After a brief delay, typi-
cally 75ns, the internal MOSFET is turned off and the C OSC
charges, repeating the cycle. Figure 5 show the relationship
between the oscillator and gate drive waveforms. The delays
in the IC force the duty cycle of the gate drive signal to be
slightly less than 50% duty cycle (typically 48%).
For V BIAS = 5V and a peak oscillator waveform voltage of
3V, the design equations simplify to:
Charging
t CHARGE = 0 . 92 × R t × C t
Discharging
t DISCHARGE ≈ 40 × C t
November 2008
11
M9999-111108
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC9130YM 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 |
| MIC9130YQS | 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 |
| MIC9130YQS 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 |
| MIC9131 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High-Voltage, High-Speed Telecom |
| MIC9131_06 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High-Voltage, High-Speed Telecom |
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