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參數(shù)資料
| 型號： | TLE8386EL |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.09 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | GREEN, PLASTIC, SSOP-14 |
| 文件頁數(shù)： | 26/26頁 |
| 文件大小： | 1527K |
| 代理商： | TLE8386EL |
TLE8386EL
Boost Regulator
Datasheet
9
Rev. 1.0, 2009-11-30
5
Boost Regulator
5.1
Description
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
Boost Regulator Block Diagram
Oscillator
FREQ/
SYNC
&
R
Q
S
OFF
when H
Q
Clock
>
1
_
Error-FF
L when
Tj > 175 °C
EA
FBH
COMP
H when
OVFB >1.25V
Output Stage
OFF when L
NOR
&
NAND 2
&
R
Q
S
Q
PWM-FF
1
INV
Gate
Driver
Gate Driver
Supply
SWO
IVCC
Current
Sense
I
Soft start
VRef
0.3 V
=
Slope Comp
t
FBL
x1
gmEA
VRef
1.25 V
=
SGND
SWCS
Current
Comp
OVFB
ISL
O
P
E
IEA
ICS
H when
lEA-ISLOPE-ICS >0
VRef
4.0 V
=
H when
IVCC <4.0V
UV IVCC
OV FB
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