Electronic Components Datasheet Search
Selected language     English  ▼


ICE2AS01 Datasheet(PDF) 11 Page - Infineon Technologies AG

Part No. ICE2AS01
Description  PWM-FF IC
Download  24 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
Logo 

 11 page
background image
Version 2.0
11
1 Feb 2002
ICE2AS01/G
ICE2BS01/G
Functional Description
recovery time. To avoid a premature termination of the
switching pulse this spike is blanked out with a time
constant of t
LEB = 220ns. During that time the output of
the Current-Limit Comparator cannot switch off the
gate drive.
3.5.2
Propagation Delay Compensation
In case of overcurrent detection the shut down of the
external
Power
Switch
is
delayed
due
to
the
propagation delay of the circuit. This delay causes an
overshoot of the peak current I
peak which depends on
the ratio of dI/dt of the peak current (see Figure 14).
.
Figure 14
Current Limiting
The overshoot of Signal2 is bigger than of Signal1 due
to the steeper rising waveform.
A propagation delay compensation is integrated to
bound the overshoot dependent on dI/dt of the rising
primary current. That means the propagation delay
time between exceeding the current sense threshold
V
csth and the switch off of the external Power Switch is
compensated over temperature within a range of at
least
.
So current limiting is now capable in a very accurate
way (see Figure 16).
E.g. I
peak = 0.5A with RSense = 2 . Without propagation
delay compensation the current sense threshold is set
to a static voltage level V
csth=1V. A current ramp of
dI/dt = 0.4A/µs, that means dV
Sense/dt = 0.8V/µs, and a
propagation delay time of i.e. t
Propagation Delay =180ns
leads then to an I
peak overshoot of 12%. By means of
propagation delay compensation the overshoot is only
about 2% (see Figure 15).
The propagation delay compensation is done by
means of a dynamic threshold voltage V
csth (see Figure
15). In case of a steeper slope the switch off of the
driver is earlier to compensate the delay.
Figure 15
Dynamic Voltage Threshold V
csth
Figure 16
Overcurrent Shutdown
3.6
PWM-Latch
The oscillator clock output applies a set pulse to the
PWM-Latch when initiating the external Power Switch
conduction. After setting the PWM-Latch can be reset
by the PWM-OP, the Soft-Start-Comparator, the
Current-Limit-Comparator, Comparator C3 or the
Error-Latch of the Protection Unit. In case of reseting
the driver is shut down immediately.
3.7
Driver
The driver is a fast totem pole gate drive, which is
designed to avoid cross conduction currents and which
is equipped with a Zener diode Z1 (see Figure 17) in
order to improve the control of the gate attached power
t
I
Se n s e
I
Lim it
t
P rop ag atio n D elay
I
O v ers h oo t1
I
pe ak 1
S ign al1
S ig nal2
I
O v ers h oo t2
I
pe ak 2
dt
dV
dt
dI
R
Sense
peak
Sense
1
0
×
t
V
csth
V
OSC
Signal1
Signal2
V
Sense
Propagation Delay
max. Duty Cycle
off time
t
0,9
0,95
1
1,05
1,1
1,15
1,2
1,25
1,3
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
1,8
2
with compensation
without compensation
dt
dV
Sense
s
V
µ
V




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
TDA4916GGPWM-FF IC SMPS IC with MOSFET Driver Output 1 2 3 4 5 MoreInfineon Technologies AG

Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com 2003 - 2017    


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl