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参数资料
| 型号： | KIT34717EPEVBE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL BOARD 5A 1.0MHZ |
| 标准包装： | 1 |
| 系列： | * |
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TYPICAL APPLICATIONS
CONFIGURING THE OUTPUT VOLTAGE:
Both channels for the 34717 are general purpose DC-DC
converters. The resistor divider to the INV node is
responsible for setting the output voltage. The equation is:
680
733
787
840
0.936 - 1.092
0.781 - 0.936
0.625 - 0.780
0.469 - 0.624
= V REF ?
+ 1 ?
V OUT
? R 1
? R 2
?
?
893
947
0.313 - 0.468
0.157 - 0.312
For channel 1: V REF =V BG =0.7V.
1000
0.000 - 0.156
For channel 2: The second channel of the 34717 has an
internal reference selector, thus V REF can be either the
voltage at VREFIN terminal or the internal reference voltage
V BG . The reference value is given by the following condition:
V REF =VREFIN if VREFIN is less than V BG =0.7 V. Otherwise,
V REF =V BG . Usually the output regulation voltage is
Table 5. Frequency Selection Table
SOFT START ADJUSTMENT
Table 6 shows the voltage that should be applied to the
ILIM1and ILIM2 pins to get the desired soft start timing.
calculated using the internal reference V BG , and the condition
V REF =VREFIN is used for tracking purposes.
SWITCHING FREQUENCY CONFIGURATION
The switching frequency will have a value of 1.0MHz by
connecting the FREQ terminal to the GND. If the smallest
frequency value of 200 kHz is desired, then connect the
FREQ terminal to VDDI. To program the switching frequency
SOFT START [MS]
3.2
1.6
0.8
0.4
VOLTAGE APPLIED TO ILIM
1.19 - 1.49 V
1.50 - 1.81 V
1.82 - 2.13 V
2.14 - 2.50 V
to another value, an external resistor divider must be
connected to the FREQ terminal to achieve the voltages
given by Table 5 .
Table 6. Soft Start Configurations
FREQUENCY
VOLTAGE APPLIED TO PIN FREQ
R FQH
VDDI
200
253
307
2.341 – 2.500
2.185 - 2.340
2.029 - 2.184
C VDDI
R IL
R IH
R IL
R IH
R FQL
FREQ
ILIM1
360
413
466
520
573
627
1.873 - 2.028
1.717 – 1.872
1.561 – 1.716
1.405 - 1.560
1.249 - 1.404
1.093 - 1.248
GND
Figure 8. Resistor Divider for Frequency and Soft Start
Adjustment
34717
Analog Integrated Circuit Device Data
20
Freescale Semiconductor
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