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| 型号： | MIC9130YQS |
| 厂商： | Micrel Inc |
| 文件页数： | 16/19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 |
| 产品目录页面： | 1086 (CN2011-ZH PDF) |
| 其它名称： | 576-2418 MIC9130YQS-ND |
V SENSE 0 . 82
I SENSE
R SENSE = = = 0 . 164 Ω
P DISS RMS SENSE = 3 . 25 2 × 0 . 164 = 1 . 7 W
= I
× R
M 2 = = OUT
M 2 REFLECTED = M 2 ×
MIC9130
A 16.2 ohm, 1%, non inductive resistor with at least a 50mW
rating should be selected. A good choice would be an 0805
size metal ? lm or a 1/8 watt leaded metal ? lm resistor. A
series resistor between the current sense transformer and
the Isns input is not necessary unless it is used for low pass
? ltering.
If the current sense transformer were not used, the sense
resistor would dissipate 1.7 watts.
5
2
Slope Compensation
Power supplies using peak current mode control techniques
require slope compensation when they are operating in
continuous mode and have a duty cycle greater than 50%.
Without slope compensation, the duty cycle of the power sup-
ply will alternate wide and narrow pulses commonly referred
to as subharmonic oscillations. Even though the MIC9130
operates below a 50% duty cycle, slope compensation adds
the bene ? ts of improved transient response and greater
noise immunity in the current sense loop (especially when
the current ramp is shallow). Slope compensation can be
implemented by adding an optimum 1/2 of the inductor cur-
rent downslope, re ? ected back to the current sense input. In
real world applications, 2/3 of the inductor current downslope
is used to allow for component tolerances.
Slope compensation at the ISNS input may be implemented
by using a resistor and capacitor as shown in Figure 12. The
rectangular waveshape of the gate drive output is integrated
by the resistor/capacitor ? lter, which results in a ramp used
for the slope compensation signal. When the gate drive and
the current signal at the sense resistor goes low, the capaci-
tor is discharged to 0V.
Gate Drive
(pin 16)
Micrel, Inc.
where :
V O is the output voltage
V D is the forward voltage drop of the recti ? er diode
L is the inductance of the output inductor (or the
secondary windin g inductance for the ? yback
topology)
M2 is the inductor current downslope
For a boost topology, the inductor downslope is:
di V ? V IN + V D
dt L
In a transformer isolated topology, the downslope must be
re ? ected back to the primary by the turns ratio of the trans-
former. The re ? ected downslope is:
Ns
Np
where : Ns/Np is the turns ratio of the secondary winding
to the primary winding.
M2 REFLECTED is the inductor curent downslope
re ? ected to the secondary side of the current
sense transformer.
The re ? ected downslope is multiplied by the current sense
resistor to obtain the downslope at the current sense input
pin (ISNS).
I SNS _ SLOPE = M 2 REFLECTED × R S
where Rs is the value of the current sense resistor.
The required downslope of the compensation ramp at the
ISNS input is:
M 3 = I SNS _ SLOPE × 0 . 67
R1 is know if a value for the resistor between the current
sense resistor and the Isns pin, has already been selected.
If not chose a value of 1k, which will minimize any offset
and signal degradation at the ISNS pin. Select a value of
C1 to minimize signal degradation from the cutoff frequency
MIC9130
R2
of R1/C1. The bandwidth should be at least six times the
C 1 =
I SNS
(pin 14)
R1
C1
R SENSE
switching frequency.
1
2 × π × f S × R 1
where: f S is the switching frequency of the power
supply (not the oscillator frequency)
M 3 = V GATE_DRIVE ×
×
V GATE _ DRIVE × R 1
di V + V D
Figure 12
The procedure outlined below demonstrates how to calculate
the component values.
Compute the inductor current downslope as seen at the cur-
rent sense input.
For a ? yback, buck or forward mode topology the
inductor downslope is equal to:
M 2 = = O
dt L
The slope of the generated compensation ramp is:
R1 1
R2 + R1 R2 × C1
Solving for R2 and assuming R2 is much greater than R1.
R 2 =
M 3 × C 1
where: V GATE_DRIVE is the amplitude of the gate
drive waveform
M9999-111108
16
November 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MIC9131BM | 功能描述:IC CTRLR DC-DC PWM HV HS 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| MIC9131BM TR | 功能描述:IC CTRLR DC-DC PWM HV HS 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
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