参数资料
| 型号： | MC34712EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC CONVERTER DDR 24QFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，DDR |
| 输入电压： | 3 V ~ 6 V |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 1.35 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
TYPICAL APPLICATIONS
PROTECTION AND DIAGNOSTIC FEATURES
COMPONENT SELECTION
SELECTION OF THE INDUCTOR
Inductor calculation is straight forward, being
SWITCHING FREQUENCY SELECTION
The switching frequency defaults to a value of 1.0 MHz
when the FREQ pin is grounded, and 200 kHz when the
FREQ pin is connected to VDDI. Intermediate switching
frequencies can be obtained by connecting an external
resistor divider to the FREQ pin. The table below shows the
resulting switching frequency versus FREQ pin voltage.
Table 5. Switching Frequency Adjustment
where,
FREQUENCY
200
253
307
360
413
466
520
573
627
680
733
787
840
893
947
1000
VOLTAGE APPLIED TO PIN FREQ
2.341 – 2.500
2.185 - 2.340
2.029 - 2.184
1.873 - 2.028
1.717 – 1.872
1.561 – 1.716
1.405 - 1.560
1.249 - 1.404
1.093 - 1.248
0.936 - 1.092
0.781 - 0.936
0.625 - 0.780
0.469 - 0.624
0.313 - 0.468
0.157 - 0.312
0.000 - 0.156
VDDI
R FQH
Maximum OFF time percentage
Switching period.
Drain – to – source resistance of FET
Winding resistance of Inductor
Output current ripple.
OUTPUT FILTER CAPACITOR
For the output capacitor, the following considerations are
more important than the actual capacitance value, the
physical size, the ESR and the voltage rating:
Transient Response percentage, TR_%
(Use a recommended value of 2 to 4% to assure a good
transient response.)
Maximum Transient Voltage, TR_v_dip = Vo*TR_%
Maximum current step,
R FQL
FREQ
GND
Inductor Current rise time,
Figure 7. Resistor Divider for Frequency Adjustment
where,
D_max = Maximum ON time percentage.
I O = Rated output current.
Vin_min = Minimum input voltage at PV IN
34712
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
17
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相关代理商/技术参数 |
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|---|---|
| MC34713 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 20WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 20WAY |
| MC34713EP | 功能描述:开关变换器、稳压器与控制器 SINGLE SWITCH REG 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 |
| MC34713EPR2 | 功能描述:开关变换器、稳压器与控制器 SINGLE SWITCH REGULATOR 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 |
| MC34715 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 2WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 2WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 2POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Vertical; No. of Contacts:2; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
| MC34716EP | 功能描述:开关变换器、稳压器与控制器 DUAL SWITCH REG 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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