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| 型号： | MC34848EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 31/38页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR BACKLIGHT 8CH 48QFN |
| 产品变化通告： | AMPD Product Discontinuation 12/Dec/2012 |
| 标准包装： | 2,000 |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 频率： | 200kHz ~ 1.2MHz |
| 电源电压： | 2.6 V ~ 3.6 V |
| 输出电压： | 45V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN-EP（7x7） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
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? ?
? ?
? I OUT ? × ( 1 ? D ) ≈ 18 . 6 kHz
2 π × L
F CROSS =
TYPICAL APPLICATIONS
? V OUT ?
2
5
Plotting the transfer function of G(s) and locating the
crossover frequency, the DC gain needed for the
compensator can be obtained, as shown in Figure 23 .
G 0 = 32.42
F CROSS = 18.6 kHz
}
DC gain needed for the
compensator ≈ 4.0627 dB
Figure 23. Transfer Function of G(s).
This DC gain needed for the compensator is actually the
value of G , whose value can be substituted above. As a
result, R COMP = 126.16 k Ω . A precision 130 k Ω @ 1%
resistor is chosen.
C COMP 2 =
1
2 π × R COMP × F P
? 15 pF
The steps to calculate the compensation capacitors are as
follows:
1. Knowing the frequency of the Right Half Plane Zero ,
3. Set a zero at one fifth of the crossover frequency that
compensates the pole, that comes from the output
capacitor and the “load resistor = V OUT /I OUT ,
? ?
? ?
? I OUT ? × ( 1 ? D ) 2 ≈ 92 . 8 kHz
F RHPZ
=
? V OUT ?
2 π × L
Then,
F Z =
F CROSS
5
≈ 3 . 7 kHz
2. Set a pole F Z at the Right Half Plane Zero, F P = F RHZP ,
then:
C COMP 1 =
1
2 π × R COMP × F Z
? 390 pF
Note: Some jitter (noise) may be present in the switching
frequency of the converter due to certain instability. The
designer should corroborate this effect by using a spectrum
analyzer. Using this instrument, the designer should play with
34848
Analog Integrated Circuit Device Data
Freescale Semiconductor
31
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相关代理商/技术参数 |
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| MC34849 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 16WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 16POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Vertical; No. of Contacts:16; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
| MC34851 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 18WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 18WAY |
| MC34853 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 16WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 16WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 16POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Right Angle; No. of Contacts:16; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
| MC34855 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 18WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 18WAY |
| MC34857 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL SMT 2WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, SMT, 2WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 2POS, 3MM; Series:2261(5561)R; Pitch Spacing:3mm; Contact Termination:Surface Mount Vertical; No. of Contacts:2; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
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