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TLD5095EL Datasheet(PDF) 11 Page - Infineon Technologies AG

Part # TLD5095EL
Description  DC/DC Boost, Buck-Boost, SEPIC controller
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLD5095EL Datasheet(HTML) 11 Page - Infineon Technologies AG

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TLD5095EL
Oscillator and Synchronization
Datasheet
11
Rev. 1.1, 2009-12-16
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
TLD5095
Oscillator
Clock Frequency
Detector
FREQ
/ SYNC
Multiplexer
PWM
Logic
Gate
Driver
SW O
RFREQ
VCLK
Oscillator_BlkDiag_SyncFixedMode .vsd
[]
()
[]
()
[]
(
) []
×
×
×
=
3
1
12
10
5
.
3
10
141
1
s
FREQ
s
f
R
FREQ


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