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| 型号： | MC34704BEPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 46/54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
V RRM ≥ Vin – Vo
? Output LC filter cutoff frequency (F LC ):
2 π LC
? L: The minimum value of inductor to maintain CCM can be
determined by using the following procedure:
D ′ min
F LC = --------------------------
OUT
[Hz]
L min ≥ ----------------- ? ------------------------------- ?
– VoT Vin min
2Io max ? Vo – Vin min ?
2
[H]
Where D’ min is the minimum off time percentage given by:
D ′ min = -------------------------
? C OUT : The three elements of output capacitor that
contribute to its impedance and output voltage ripple are
the ESR, the ESL and the capacitance C. The minimum
capacitor value is approximately:
Vin min
Vout max
C OUT ≥ ----------------------------
Io max D max
F SW Δ Vo r
[F]
? Cutoff frequency due to capacitor ESR:
F ESR = --------------------------------------
( D ′ min ) R LOAD
RHP Z = ----------------------------------------
? Where Δ VO r is the desired output voltage ripple.
? Now calculate the maximum allowed ESR to reach the
desired.
1
2 π ( C OUT ) ESR
? The right plane zero frequency:
2
D ? 2 π L
[Hz]
[Hz]
Δ Vo r
? ---------------------- + ------------- ?
ESR ≤ ------------------------------------------------
Io max I OB
? 1 – D max 1 – D ?
[ Ω ]
? Crossover frequency (or bandwidth): select this
frequency as far away form the RHP Z as much as
possible:
F BW ? ---------------
? R1 and RB: These two resistors help to set the output
voltage to the desire value using a V FB 7=0.6V, select R1
between 10 k and 150 K and then calculate RB as follows:
RHP Z [Hz]
6
The Type 3 external compensation network will be in
charge of canceling some of these poles and zeros to
RB = ---------------------------------- R1
0.9
1.5 – Vo – 0.9
[ Ω ]
achieve stability in the system. The following poles and
zeroes frequencies are provided by the type 3 compensation:
NOTE: RB is not grounded, instead is connected to
F 2P = ----------
VREF7 pin (VREF7=1.5 V) which provide a positive voltage
to assure a positive voltage at the FB7 pin.
? Compensation network. (C1,C2,C3, R2, R3)
F PO = F BW
F P1 = F ESR
F Z1 = 0.9F LC
F SW
2
F 22 = 1.1F LC
For compensating a buck converter, 4 important
frequencies referring to the plant are:
34704
Analog Integrated Circuit Device Data
46
Freescale Semiconductor
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