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| 型号： | MC34701EK |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 31/39页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY MCU 1A 32-SOIC |
| 标准包装： | 42 |
| 应用： | 转换器，Freescale 电源 QUICC? I，II |
| 输入电压： | 2.8 V ~ 6 V |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 32-SOIC |
| 包装： | 管件 |
| 配用： | KIT33701DWBEVB-ND - KIT FOR 33701 POWER SUPPLY |
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TYPICAL APPLICATIONS
.
R2 = V Ref ? -----------------------------------------------------------------------------------------
? V O + I O ? R L ? – V Ref V O – V Ref
-------------------------------------------------------- + --------------------------
G ain
[dB]
20
fLC
R4 R1
1
0
fz(c)
f BW
fz(E SR) fp (FF)
Where V Ref is the buck regulator reference voltage ?
(V Ref = 0.8V typ.) at the INV pin, ?
V O is the selected output voltage, ?
I O is the output load current, ?
R L is the DC resistance of the inductor L.
-20
-40
-180
fp(c)
It is apparent that the buck regulator output voltage is
affected by the voltage drop caused by the inductor serial
resistance and the regulator output current. In those
applications which do not require precise output voltage,
setting the formula for calculating selected output voltage can
be simplified as follows:
R2 = V Ref ? ----------------------------------------------------------------
? V O – V Ref ? ? ---------------------------
Pha se
[Deg.]
1
? R1 + R4 ?
R1 ? R4
V LDO = V Ref ? ? ? ? ?
R U
-2 70
-3 60
? m
Linear Regulator Output Voltage
The output voltage of the linear regulator (LDO) can be set
by a simple resistor divider according to the following formula:
1 + -------
R L
1.0
10
100
10 00
10000
f z ? ESR ? = ----------------------------
Frequency [k Hz ]
Figure 30. Buck Control Loop Bode Plot
The frequency of the zero created by the ESR of the output
capacitor C O is calculated as:
1
2 ? C O ESR
Where C O is the value of the buck regulator output
capacitor, and ESR is the equivalent series resistance of the
output capacitor.
The frequency of the compensating network pole can be
calculated as follows:
Where V Ref is the linear regulator reference voltage ?
(V Ref = 0.8V typ.) at the LFB pin, ?
V LDO is the LDO selected output voltage, ?
R U is the “upper” resistor of the LDO resistor divider, ?
R L is the “lower” resistor of the LDO resistor divider.
Figure 31 describes the 34701 linear regulator circuit with
the resistor divider R U , R L setting the output voltage V LDO .
2.8 V to 6. 0 V Input
MC34701
VIN1
f p ? c ? = -------------------------------------------
2 ? C2 ---------------------------
1
R1R3
? R1 + R3 ?
The well designed and compensated buck regulator
should yield at least 45 deg. phase margin ? m of its overall
LDRV
CS
LDO
LFB
LCMP
RS
RU
RL
VLDO
CLDO
Selecting Buck Regulator Output Voltage
The 34701 buck regulator output voltage can be set by
selecting the right value of the resistors R1, R2 and R4, and
LDO
Compensation
Figure 31. 34701Linear Regulator Circuit
page 30 for the component references):
34701
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
31
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34701EKR2 | 功能描述:开关变换器、稳压器与控制器 QUICCSUPPLY1 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34702EK | 功能描述:开关变换器、稳压器与控制器 QUICCSUPPLY2 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34702EKR2 | 功能描述:开关变换器、稳压器与控制器 QUICCSUPPLY2 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34703 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 7WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 7WAY |
| MC34703PNB | 功能描述:开关变换器、稳压器与控制器 QUICC SUPPLY 3 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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