TLE 6365G Infineon Technologies, TLE 6365G Datasheet - Page 10

• Manufacturer Part Number: TLE 6365G
• Manufacturer: Infineon Technologies

Specifications of TLE 6365G

• Packages: PG-DSO-8
• Comment: -
• Vq (max): 5.0V
• Iq (max): 400.0 mA
• Iq (typ): 1,500.0 µA
• Output: Buck Converter

TLE 6365
Buck Converter
A stabilized logic supply voltage (typ. 5 V) for general purpose is realized in the system
L
by a buck converter. An external buck-inductance
is PWM switched by a high side
BU
DMOS power transistor with the programmed frequency (pin R).
The buck converter uses the temperature compensated bandgap reference voltage (typ.
2.8 V) for its regulation loop.
This reference voltage is connected to the non-inverting input of the error amplifier and
V
an internal voltage divider supplies the inverting input. Therefore the output voltage
CC
is fixed due to the internal resistor ratio to typ. 5.0 V.
The output of the error amplifier goes to the inverting input of the PWM comparator as
well as to the buck compensation output BUC.
When the error amplifier output voltage exceeds the sawtooth voltage the output power
MOS-transistor is switched on. So the duration of the output transistor conduction phase
V
depends on the
level. A logic signal PWM with variable pulse width is generated.
CC
External loop compensation is required for converter stability, and is formed by
R
C
connecting a compensation resistor-capacitor series-network (
,
) between pin
BUC
BUC
BUC and GND.
V
In the case of overload or short-circuit at
(the output current exceeds the buck
CC
I
overcurrent threshold
) the DMOS output transistor is switched off by the
BUOC
overcurrent comparator immediately.
V
In order to protect the
input as well as the external load against catastrophic failures,
CC
an overvoltage protection is provided which switches off the output transistor as soon as
V
V
the voltage at pin
exceeds the internal fixed overvoltage threshold
= typ.
CCOVOFF
CC
6.0 V.
Also a battery undervoltage protection is implemented in the TLE 6365 to avoid wrong
operation of the following supplied devices, the typical threshold when decreasing the
V
battery voltage is at
= typ. 4.0 V.
SUVOFF
Data Sheet
10
Rev. 1.9, 2007-07-30