参数资料
| 型号： | MC34703PNB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 29/46页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY QUICC 33-QFN |
| 标准包装： | 1 |
| 应用： | 电源 |
| 电流 - 电源： | 60mA |
| 电源电压： | 2.8 V ~ 13.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 33-PowerQFN |
| 供应商设备封装： | 33-PQFN（10x10） |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页当前第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页
TYPICAL APPLICATIONS
high as possible unit gain crossover frequency with a gain
F p1 , p2 = ------------------------------
If R 9 is chosen as 5.1 k ? (recommended), R 14 will be
calculated as 4.08 k ? for the output voltage of 1.8 V; in a
same manner, R 14 is 1.63 k ? for an output voltage of 3.3 V.
We recommend using 1% tolerance resistors (R 9 and R 14 )
for the precise output voltage.
The following table shows the recommendation values of
R 9 and R 14 as referred to different buck output voltages:
Table 11. Recommendation of R 9 and R 14 Value for
Different Output Voltage
slope of -1, and enough phase margin ( at least 45°) for the
closed loop transfer function. The bandwidth should be
between 20 -30% of the switching frequency. In the power
system, there is a double pole created by the output LC filter,
and a zero generated by output capacitor ESR (equivalent
series resistance).
The poles are located:
1
2 π L O × C O
Vo
R9 (K ? )
R14 (K ? )
F z1 = ---------------------------------------
0.8
1.8
2.0
3.3
5.0
5.1
5.1
5.1
5.1
5.23
?
4.12
3.4
1.65
1.0
The zero is located:
1
2 π × R ESR × C 0
Where C O is the capacitance of the output capacitor, L o is
the inductance of the output filter inductor. R ESR is the total
Compensation Loop Determination
The MC34703 has a simple PWM voltage mode control
loop to achieve an excellent line and load regulation. The
goal for the compensation loop circuit design is to achieve as
Vin
SW
equivalent series resistance of output capacitors.
Based on the typical system conditions, the type 3
compensation scheme has been chosen to use as shown in
Lo
Vout
Gate
Drivers
High Side
Low Side
C26
R9
+ Co1
PWM
ERROR
COMPARATOR AMPLIFIER
INV
R12
Vref
C24
SAW
VOLTAGE
Vref
( 0.8 V)
R5
C2
R14
COMP
Figure 28. Buck Regulator Compensation Circuit
34703
Analog Integrated Circuit Device Data
Freescale Semiconductor
29
相关PDF资料 |
PDF描述 |
|---|---|
| MC34704AEP | IC POWER MANAGEMENT 56-QFN |
| MC34708VM | IC POWER MANAGEMENT 206MAPBGA |
| MC34710EWR2 | IC PWR SUPPLY ADJ DUAL SW 32SOIC |
| MC34712EPR2 | IC CONVERTER DDR 24QFN |
| MC34713EPR2 | IC CONVERTER DDR 24QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34704AEP | 功能描述:开关变换器、稳压器与控制器 DSC8 PASS.1.3 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 |
| MC34704AEPR2 | 功能描述:开关变换器、稳压器与控制器 DSC8 PASS1.3 TAPE 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 |
| MC34704BEP | 功能描述:开关变换器、稳压器与控制器 5CH DC-DC PWR MANGMNET I 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 |
| MC34704BEPR2 | 功能描述:开关变换器、稳压器与控制器 5CH DC-DC PWR MANGMNET 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 |
| MC34705 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 12WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 12WAY |
发布紧急采购，3分钟左右您将得到回复。