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| 型号： | TLE8386EL |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 稳压器 |
| 英文描述： | 0.09 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | GREEN, PLASTIC, SSOP-14 |
| 文件页数： | 3/26页 |
| 文件大小： | 1527K |
| 代理商： | TLE8386EL |
TLE8386EL
Oscillator and Synchronization
Datasheet
11
Rev. 1.0, 2009-11-30
6
Oscillator and Synchronization
6.1
Description
R_OSC vs. switching frequency
The internal oscillator is used to determine the switching frequency of the boost regulator. The switching frequency
can be selected from 100 kHz to 500 kHz with an external resistor to GND. To set the switching frequency with an
external resistor the following formula can be applied.
In addition, the oscillator is capable of changing from the frequency set by the external resistor to a synchronized
frequency from an external clock source. If an external clock source is provided on the pin FREQ/SYNC, then the
internal oscillator synchronizes to this external clock frequency and the boost regulator switches at the
synchronized frequency. The synchronization frequency capture range is 250 kHz to 500 kHz.
Figure 4
Oscillator and Synchronization Block Diagram and Simplified Application Circuit
Figure 5
Synchronization Timing Diagram
TLE8386
Oscillator
Clock Frequency
Detector
FREQ
/ SYNC
Multiplexer
PWM
Logic
Gate
Driver
SW O
RFREQ
VCLK
Oscillator_BlkDiag.vsd
[]
()
[]
()
[]
() []
×
×
=
3
1
12
10
5
.
3
10
141
1
s
FREQ
s
f
R
FREQ
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