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| 型号： | MC34704BEPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 41/54页 |
| 文件大小： | 0K |
| 描述： | IC PWR MNGMT DC-DC MULT 56-QFN |
| 特色产品： | MC34704 Multi-channel Power Management IC (PMIC) |
| 标准包装： | 1 |
| 应用： | 处理器 |
| 电流 - 电源： | 86mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-VFQFN 裸露焊盘 |
| 供应商设备封装： | 56-QFN-EP（7x7） |
| 包装： | 标准包装 |
| 产品目录页面： | 809 (CN2011-ZH PDF) |
| 其它名称： | MC34704BEPR2DKR |
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FUNCTIONAL DEVICE OPERATION
COMPONENT CALCULATION
Io max T [s]
Δ Iostep
RB = ---------------------
Vo -
1. First calculate the dt_I (inductor current rising time)
given by:
dtI = --------------------
Where the parameter Δ Io_step is the maximum current
step during the current rising time and is define as:
? R1 and RB: These two resistors help to set the output
voltage to the desire value using a Vref=0.6 V, select R1
between 10 k and 100 K and then calculate RB as follows:
R1
[ Ω ]
----------- – 1
Vref
? Compensation network. (C1,C2,C3, R2, R3): For
compensating a buck converter, 3 important frequencies
Δ Iostep = ? ? ? ? ? ? ? ?
D max Vin min – Vo
------------- -------------------------------
Fsw L
[A]
referring to the plant are:
1. Output LC filter cutoff frequency (F LC ):
2. Then the output capacitor can be chosen as follow:
C OUT ≤ ----------------------
F LC = --------------------------
2 π LC
Io max dtI
Δ Vo max
[A]
1
OUT
2. Cutoff frequency due to capacitor ESR:
[Hz]
F ESR = --------------------------------------
? Where Δ VO max is the maximum allowed transient
overshoot expressed as a percentage of the output
voltage, typically from 3 to 5% of Vo.
3. Finally find the maximum allowed ESR to allow the
desired transient response:
1
2 π ( C OUT ) ESR
3. Crossover frequency (or bandwidth):
[Hz]
Δ Vo r ( Fsw ) ( L )
Vo ( 1 – D min )
F BW = ----------
ESR max = -------------------------------------- [ Ω ]
NOTE: Do not use the parameters Δ VO r and Δ VO max
indistinctly, the first one indicates the output voltage ripple,
F SW [Hz]
10
The Type 3 external compensation network will be in
charge of canceling some of these poles and zeros to
achieve stability in the system. The following poles and
zeroes frequencies are provided by the type 3 compensation.
while the second one is the maximum output voltage
overshoot (transient response).
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
41
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