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参数资料
| 型号： | MIC3263YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 21/32页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER 6CH BKLT 24-MLF |
| 特色产品： | MIC3263 Boost Switching Regulator |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 400kHz ~ 1.8MHz |
| 电源电压： | 6 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘，24-MLF? |
| 供应商设备封装： | 24-MLF?（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 576-3663-6 MIC3263YML TRDKR MIC3263YML TRDKR-ND |
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Micrel, Inc.
MIC3263
D' R LOAD
Equation 3 shows that s =
2
L
is a right-half plane
Error Amp
The error amp is a g m type and the gain – G EA (S) – is:
zero (f RH PZ ):
Equation 5 :
D' R LOAD
G ea m ? Z o II ? R COMP +
Equa tion 4:
RHP Zero → f RHPZ =
2
2 π L
(s) = g
? ?
? ?
1 ? ?
? ?
sC COMP ? ?
Zero
2 π R C
The loop bandwidth should be about 1/10 of t he f RHPZ to
ensure stability. From Equation 3, it is shown th a t there is
only the single pole due to R LOAD C OUT . T his greatly
simplifies the compensation.
One needs only to get a bode plot of the trans fer function
of the control to output G VC (S) with a network a nalyzer.
To measure G VC (S), tie CRV to a DC voltage source. Tie
CRV to the steady state voltage that CRV will operate
usually between 1V and 2.4V. By connectin g CRV to a
consta nt DC voltage, this effectively opens the CRV
control loop and allows the measurement of the boost
control loop. G VC (S) can be calculated with a computer
using the above equation. From the bode plot of G VC (S)
find what the gain of G VC (s) is at 1/10 of f RHPZ or less. Nex t
design the error amp gain G EA (s) so the loop g ain at the
cross over frequency T(f CO ) is 0db where f CO =1 /10 of f RHPZ
or lower.
g m = 0.056mA/V and Z O = 5M ? . T he error amplifier zero is
1
f = . Set the f CO at the mid band
COMP COMP
where G EA (f CO ) = g m × R COMP . At f ZERO × 10 the phase boost
is near its maximum.
40
20
0
Midband Gain
Figure 15. Internal Error Amp and External Compensation
Examp le 1
-20
-40
Fzero
Conditions: V IN = 12V, V OUT = 29V, I OUT = 0.18A, L = 22 μ H,
C OUT = 4.7 μ F R LOAD = V OUT /I OUT = 161 ? . When V CRV =
1.8V, the f RHPZ is:
D' R LOAD
-60
-80
-100
Gain
Phase
f RHPZ =
2
2 π L
= 162kH z
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
Freq
Figure 16 shows a plot of:
Figure 14. Error Amp Transfer Function
G vc (s) =
V OUT ( s )
V CONTROL ( s )
? ?
? 1-
?
2 R
? ?
? 1 ? ? D'R LOAD ? ?
LOAD ?
? ? 1+ sR LOAD C OUT ?
= ? ?? ?
? Ri ? ? 2
? ?
sL
D'
? 2 ?
January 2010
21
M9999-012110
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相关代理商/技术参数 |
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|---|---|
| MIC3287 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL |
| MIC3287_10 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL |
| MIC3287-24YD6 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC3287-24YD6 TR | 功能描述:LED照明驱动器 2x2mm White LED Driver w/ 24V OVP (Lead Free) RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MIC3287-24YD6TR | 制造商:RF Micro Devices Inc 功能描述: |
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