TLE 8386EL Infineon Technologies, TLE 8386EL Datasheet - Page 9

• Manufacturer Part Number: TLE 8386EL
• Manufacturer: Infineon Technologies

Specifications of TLE 8386EL

• Packages: PG-SSOP-14
• Comment: HS-sense-booster (prefered as current source)Max. output current dependent on output voltage.
• Vq (max): adj (max 9-times of VS)
• Iq (max): -
• Iq (typ): 7,000.0 µA
• Output: Boost Converter

5
5.1
The TLE8386EL boost (step-up) regulator provides a higher output voltage than input voltage. The boost regulator
function is implemented by a pulse width modulated (PWM) current mode controller. The PWM current mode
controller uses the peak current through the external power switch and error in the output current to determine the
appropriate pulse width duty cycle (on time) for constant output current. The current mode controller it provides a
PWM signal to an internal gate driver which then outputs the same PWM signal to external n-channel
enhancement mode metal oxide field effect transistor (MOSFET) power switch. The current mode controller also
has built-in slope compensation to prevent sub-harmonic oscillations which is a characteristic of current mode
controllers operating at high duty cycles (>50% duty). An additional built-in feature is an integrated soft start that
limits the current through the inductor and external power switch during initialization. The soft start function
gradually increases the inductor and switch current over 1 ms (typical) to minimize potential overvoltage at the
output.
Figure 3
Datasheet
FREQ/
SYNC
COMP
OVFB
FBH
FBL
0.3 V
V
Ref
Oscillator
Boost Regulator
Description
Boost Regulator Block Diagram
x1
=
1.25 V
V
Ref
Soft start
=
OV FB
I
Slope Comp
EA
H when
OVFB >1.25V
gmEA
t
I
EA
Current
Comp
L when
T
H when
l
EA
j
> 175 °C
-I
SLOPE
Clock
-I
CS
> 0
R
S
Error -FF
9
&
&
OFF
when H
Q
Q
NOR
_
>
1
Output Stage
OFF when L
H when
IVCC <4 .0V
NAND 2
&
R
S
PWM-FF
&
&
UV IVCC
Q
Q
=
4.0 V
INV
V
Rev. 1.0, 2009-11-30
1
Ref
I
CS
Boost Regulator
Current
Sense
Gate Driver
Supply
Gate
Driver
TLE8386EL
IVCC
SWCS
SWO
SGND