Datasheet

TLE 6365
Data Sheet 11 Rev. 1.9, 2007-07-30
Figure 4 Buck Converter Block Diagram
AEA03316.VSD
t
f
t
r
t
r
t
f
Oscillator
t
r
t
r
Schmitt-Trigger 1
V
max
V
min
V
high
V
low
tt
Ramp
R Pin 1
& &
R
Q
S
OFF when H
Q
Clock
>1
_
Error-FF
L when
T
j
> 175°C
R
VCC2
28 Ω
R
VCC1
22 Ω
Error Amp.
GND
V
Ref
2.8 V
V
CC
Pin 5
V
CC
BUC Pin 3
R
Prot1
Error-Signal
Error-Ramp
PWM Comp.
H when Error-Signal < Error-Ramp
Output Stage OFF when H
NOR1
GND
L when Overcurrent
&
NAND 2
& &
R
Q
S
H = OFF
Q
PWM-FF
1
INV
H = ON
Gate Driver
Gate Driver
Supply
Power
D-MOS
BUO Pin 7 BDS Pin 6
OC Comp.
=
R
Sense
18 mΩ
V
thOC
18 mV
V
S
Pin 8
R
VCC4
10.3 Ω
R
VCC3
39.7 Ω
OV Comp.
=
GND
V
thOV
1.2 V
V
CC
GND
UV Comp.
=
GND
V
thUV
4 V
200
Ω
H when OV at
V
CC
H when UV at
V
BOOST