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參數資料
| 型號： | TLE6389GVT |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 420 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | PLASTIC, DSO-14 |
| 文件頁數： | 24/37頁 |
| 文件大小： | 368K |
| 代理商： | TLE6389GVT |
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TLE 6389
Preliminary data sheet Rev. 1.0
30
2003-05-05
depends on the MOSFET drain-to-source on-resistance, the current-sense resistor and
the inductor series resistance. It is proportional to the load current:
7.8
SYNC Input and Frequency Control
The TLE6389’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 TLE6389GV 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.
7.10
Buck converter circuit
A typical choice of external components for the buck converter circuit is given in figure
2 and 3. For basic operation of the buck converter the input capacitors C
IN1, CIN2, the
driver supply capacitor C
BDS, the sense resistor RSENSE, the PMOS device, the catch
diode D1, the induuctance 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 optimzed for inductance values of 47H and
V
drop
I
LOAD
R
DS ON
()PMOS
R
SENSE
R
INDUCTANCE
++
()
=
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