参数资料
| 型号： | MC34717EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 22/28页 |
| 文件大小： | 0K |
| 描述： | IC CONVERTER DDR 26QFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，DDR |
| 输入电压： | 3 V ~ 6 V |
| 输出数： | 2 |
| 输出电压： | 0.7 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 26-VFQFN 裸露焊盘 |
| 供应商设备封装： | 26-QFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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TYPICAL APPLICATIONS
5. Equating pole 2 to 5 times the Crossover Frequency
SW x
L x
achieves a faster response and a proper phase margin
----------------------------------------
2 π ? R F --------------------
VOUT x
INV x
R Sx
C Sx
C Xx
R Fx
R1 x
R2 x
C Ox
5 ? F CROSS = F
P2 =
1
C F C X
C F + C x
COMP x
C Fx
C X =
C F
2 π * R F C F F P 2 ? 1
Figure 9. Type III compensation network
1. Choose a value for R1
2. Consider a Crossover frequency of one tenth of the
switching frequency, set the Zero pole frequency to
Fcross/10
TRACKING CONFIGURATIONS.
This device allows two tracking configurations: Ratiometric
and Co-incidental Tracking.
F P 0
=
1
10
F CROSS =
1
2 π * R 1 C F
Vmaster
C F =
1
2 π * R 1 F PO
Different Slope
3. Knowing the LC frequency, the Frequency of Zero 1
and Zero 2 in the compensation network are equal to
F LC
Vslave
F LC =
1
2 π L X Co X
= F Z 1 = F Z 2
Figure 10. Ratiometric Tracking
F Z 1 =
1
2 π * R F C F
F Z 2 =
1
2 π * R 1 C S
Vmaster
This gives the result
Slave Regulation Point
R F =
1
2 π * C F F Z 1
C S =
1
2 π * R 1 F Z 2
Same Slope
Vslave
4. Calculate R S by placing the first pole at the ESR zero
frequency
F ESR =
1
2 π * Co X * ESR
= F P 1
Figure 11. Co-incidental Tracking
RATIOMETRIC TRACKING CIRCUIT
F P 1 =
1
2 π * R S C S
R S =
1
2 π * F P 1 C S
CONFIGURATION
The master voltage feedback resistor divider network is
used in place of R 3 and R 4 as shown in Figure 12 . The slave
output is connected through its own feedback resistor divider
network to the INV- terminal, resistors R 1 and R 2 . All four
34717
Analog Integrated Circuit Device Data
22
Freescale Semiconductor
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