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參數資料
| 型號： | TLE6389-3GV50 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 穩壓器 |
| 英文描述： | 2.3 A SWITCHING CONTROLLER, 420 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | PLASTIC, SOP-14 |
| 文件頁數： | 25/38頁 |
| 文件大小： | 1233K |
| 代理商： | TLE6389-3GV50 |
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TLE 6389
Datasheet Rev. 2.1
31
2007-08-13
7.8
SYNC Input and Frequency Control
The TLE 6389’s internal oscillator is set for a fixed PWM switching frequency of 360kHz
or can be synchronized to an external clock at the SYNC pin. When the internal clock is
used SYNC has to be connected to GND. SYNC is a negative-edge triggered input that
allows synchronization to an external frequency ranging between 270kHz and 530kHz.
When SYNC is clocked by an external signal, the converter operates in PWM mode until
the load current drops below the PWM to PFM threshold. Thereafter the converter
continues operation in PFM mode.
7.9
Shutdown Mode
Connecting ENABLE to GND places the
TLE6389-2 GV in shutdown mode. In
shutdown, the reference, control circuitry, external switching MOSFET, and the oscillator
are turned off and the output falls to 0V. Connect ENABLE to voltages higher than 4.5V
for normal operation. As this input operates analog the voltage applied at this pin should
have a slope of 0.5V/3s to avoid undefined states within the device.
7.10
Buck converter circuit
A typical choice of external components for the buck converter circuit is given in figure
IN1, CIN2, the
driver supply capacitor C
BDS, the sense resistor RSENSE, the PMOS device, the catch
diode D1, the inductance L1 and the output capacitor C
OUT are necessary. In addition for
low electromagnetic emission a Pi-filter at the input and/or a small resistor in the path
between GDRV and the gate of the PMOS may be necessary.
7.10.1
Buck inductance (L1) selection in terms of ripple current:
The internal PWM/PFM control loop includes a slope compensation for stable operation
in PWM mode. This slope compensation is optimized for inductance values of 47H and
Sense resistor values of 47m
for the 5V output voltage versions. When choosing an
inductance different from 47H the Sense resistor has to be changed also:
Increasing this ratio above 1000
/H may result in sub harmonic oscillations as well-
known for peak current mode regulators without integrated slope compensation.
RSENSE
L1
-------------------
(0,5...1,0
)
3
×10
H
----
=
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